Title of Invention	A NOAQUEUS ELECTROLYTE FOR BATTERIES AND A LITHIUM SECONDARY BATTERY INCORPORATING SAID ELECTROLYTE
Abstract	The invention discloses a nonaqueous electrolyte for batteries, containing a lithium salt and a liquid electrolyte compound, wherein the nonaqueous electrolyte further comprises halogen selected from the group consisting of iodine, chlorine, bromine and a mixture of two or more thereof. The invention is also for a Lithium Secondary Battery incorporating said electrolyte.

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A NONAQUEOUS ELECTROLYTE FOR BATTERIES AND A LITHIUM SECONDARY BATTERY INCORPORATING SAID ELECTROLYTE Technical Field The present invention relates to a lithium secondary battery with improvements in charge/discharge and cycle life characteristics at ambient and high temperatures, and/or storage characteristics and safety at high temperature, as well as a nonaqueous electrolyte for use therein. Background Art With the recent advancement of electronic technology, portable information devices, such as mobile phones, PDA and laptop computers, are widely used. In such portable information devices, there are strong demands for smaller size, lighter weight, and continuous long-term driving. As a driving power source for such portable information devices, batteries are used. Thus, studies to develop batteries, particularly lithium secondary batteries using nonaqueous electrolytes, which have light weight while showing high voltage, high capacity, high power, high energy density and long cycle life, are being actively conducted. Generally, lithium secondary batteries utilize lithium- containing transition metal oxide as a positive active material. Examples of the positive active material include LiCoO2, LiNiO2, LiMn2O4, LiMnC2, LiNi1-xCoxMYO2 (M = Al, Ti, Mg or Zr; 0 Furthermore, the lithium secondary batteries utilize carbon, lithium metal or alloy as a negative active material. Also, metal oxides, such as TiO2 and SnO2, which can store and release lithium ions and have a potential of less than 2V for lithium, may be used as the negative active material. When such lithium secondary batteries are stored at high temperature or exposed to high temperature, gas will be generated within the batteries by the side reaction of electrodes with the electrolyte oxides, resulting in deterioration in storage life characteristics and safety at high temperature, as well as deterioration in battery performance. Meanwhile, regarding an improvement in the cycle life of the lithium secondary batteries, Japanese Patent Laid-open Publication No. 1996-138735 describes that if LiPF6 was used as an electrolyte, ar effect on the improvement of cycle life by the addition of metal halides would not be obtained. Disclosure of the Invention It is an object: of the present invention to provide a lithium secondary oattery which has improvements in charge/discharge efficiencies and cycle life characteristics even when it operates at ambient or high temperature. Another object of the present invention is to provide a lithium secondary battery with high-temperature safety, in which the generation of gas by the side reaction of electrolyte oxides with electrodes is inhibited even when the battery is stored at high temperature or exposed to high temperature. The present inventors have found that the use of metal halide in a non-aqueous electrolyte has little or no effect on the improvement of battery cycle life and shows a reduction in battery cycle life, whereas the use of halogen, such as iodine, chlorine or bromine, in the nonaqueous electrolyte, has an effect on the improvement of battery cycle life and shows improvements in. storage characteristics and safety at high temperature, unlike the case of the metal halide. Moreover, the present inventors have found that the addition of both a pyrrole or its derivative and halogen to the nonaqueous electrolyte has a synergistic effect on the improvement of battery cycle; life. The present invention has been made based on these findings. The present invention provides: (i) a nonaqueous electrolyte for batteries, which is characterized by containing halogen; . (ii) a nonaqueous electrolyte for batteries, which is characterized by containing pyrrol or its derivative and halogen; and (iii) a lithium secondary battery which is characterized by including the nonaqueous electrolyte (i) or (ii). The addition of halogen, such as iodine, chlorine or bromine, into the nonaqueous electrolyte, results in an improvement in the cycle life of the lithium secondary battery. Meanwhile, although an SEI insulator film having no electron conductivity is formed on the negative electrode surface of the lith.um secondary battery, the addition of pyrrole or its derivative to the nonaqueous electrolyte leads . to the formation cf polypyrrole, an electron-conducting polymer, thus lowering resistance. Furthermore, by a synergistic effect with halogen, the pyrrole or its derivative in the nonaqueous electrolyte provides an improvement in charge/discharge cycle characteristics and an outstanding improvement in battery cycle life. Moreover, if halogen is used as an electrolyte additive as described above, the high-temperature safety of the battery will be secured. The reason thereof is as follows. If the battery is stored at high temperature or exposed to high temperature, the solvent in the nonaqueous electrolyte will be partially oxidized to cause a side reaction with the positive and negative electrodes of the battery, thus generating gas. This will cause not only deterioration in the battery performance but also deterioration in the battery swelling leading to deterioration in the battery safety. Halogen, such as iodine, chlorine or bromine, which is used as the electrolyte additive, is a material having strong adsorption property. Thus, the halogen is adsorbed on the electrodes upon initial charge, so that when the battery is stored at high temperature or exposed to high temperature, the halogen inhibits "he side reaction between the oxide of the electrolyte and :he positive and negative electrodes, thus inhibiting the generation of gas. For this reason, a swelling phenomenon at high temperature occurs less seriously. Thus, the use of the halogen can provide a battery having excellent storage characteristics and safety at high temperature. Particularly, the use of iodine as the electrolyte additive has the greatest effect on the inhibition of gas generation. The halogen is added to the nonaqueous electrolyte at an amount ranging from 0.005% by weight to 1% by weight. If the halogen is used at amounts out of this content range, it will have a reduced effect on the improvement of battery cycle life. The content of the halogen in the nonagueous electrolyte is preferably in a range of 0.01-0.5% by weight. At a content of less than 0.01% by weight, the halogen will have an insignificant effect on the inhibition of gas generation, and at a content of more than 0.5% by weight, it will cause deterioration in the battery performance. The pyrrole or its derivative is preferably added to the nonaqueous electrolyte at the amount of 0.01-0.5% by weight. At less than 0.01% by weight, the thickness of a film formed from the pyrrole or its derivative will be insufficient, and at more than 0.5% by weight, the charge characteristic of the battery will be poor. Examples of the halogen include, but are not limited to, iodine, chlorine and bromine. Examples of. the pyrrole derivative include, but are not limited to, 2,5-dimethylpyrrole, 2,4-dimethylpyrrole, 2- acetyl N-methylpyrrole, 2-acetylpyrrole, and N-methylpyrrole. The inventive lithium secondary battery includes the inventive nonaqueous electrolyte. Examples of the lithium secondary batteries include lithium-metal secondary batteries, lithium-ion secondary batteries, lithium polymer secondary batteries, and lithium-ion polymer secondary batteries. The inventive lithium secondary battery includes: a) a positive electrode capable of storing and releasing lithium ions; b) a negative electrode capable of storing and releasing lithium ions; c) a porous separator; and d) a nonaqueous electrolyte containing: i) a lithium salt; and ii) a liquid electrolyte compound. The inventive nonaqueous electrolyte preferably contains cyclic carbonate and/or linear carbonate. Examples of the cyclic carbonate include, are not limited to/ ethylene carbonate (EC) , propylene carbonate (PC) and gamma- butyrolactone (GBL) Examples of the linear carbonate include, but are not limited to, diethyl carbonate (DEC), dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), and methylpropyl carbonate (MPC). The inventive nonaqueous electrolyte contains lithium salts which are preferably selected from the group consisting of LiClO4, LiCF3SO3, LLPF6, LiBF4, LiAsF6, and LiN(CF3SO2)2. In the present invention, lithium-containing transition metal oxide is used as a positive active material. Examples of the positive active material include, but are not limited to, LiCoO2, LiNiO2, L.LMn2O4, LiMnO2, LiNi1-xCOxMyO2 (M = Al,. Ti, Mg or Zr; 0 0.5; 0 metal oxides, such as MnO2., or a mixture of two or more thereof may be used as the positive active material. As a negative active material, carbon, lithium metal or alloy may be used. Also, in the inventive lithium secondary battery, separator may be a porous separator, such as a porous polyolefin separator. According to a conventional method, the inventive lithium secondary battery can be fabricated by placing the porous separator between the positive electrode and the negative electrode and introducing a nonaqueous electrolyte containing the lithium salt, such as LiPF6, and additives. The inventive lithium secondary battery may be used in a pouch, cylindrical or angular shape. Advantageous Effect According to the present invention, the cycle life of the lithium secondary battery can be improved by adding the halogen to the nonaqueous electrolyte of the lithium secondary battery, and a synergistic effect on the improvement of the battery cycle life can be expected by adding pyrrole or its derivative together with the halogen to the nonaqueous electrolyte. This effect on the improvement of the battery cycle life suggests an improvement in the charge/discharge cycle characteristics of the battery. In addition, according to the present invention, the halogen, such as iodine, chlorine or bromine, is added to the nonaqueous electrolyte of the lithium secondary battery. When the lithium secondary battery is stored at high temperature or exposed to. high tenperature, the added halogen is adhered to the electrode surface so as to inhibit the side reaction between the oxides formed by the oxidation of the electrolyte at high temperature and the positive and negative electrodes, thus inhibiting the generation of gas. Thus, the present invention can provide the battery having excellent storage characteristics and safety at high temperature. Brief Description of the Drawings FIG. 1 is a graphic diagram showing the comparison of discharge capacity ratio at a range of initial cycle to 4OO cycles between batteries fabricated according to Comparative Examples 1 to 3 and Example 1. FIG. 2 is a graphic diagram showing the comparison of discharge capacity xatio at: a range of initial cycle to 4OO cycles between batteries fabricated according to Comparative Examples 4 and 5 and Examples 2 and 3. FIG. 3 is a graphic diagram showing a change in thickness at a high-temperature storage state for 383562-size lithium polymer batteries fabricated according to Examples 4 and 5 and Comparative Examples 6 and 7. Best: Mode for Carrying Out the Invention Hereinafter, the present invention will be described in detail by examples. It is to be understood, however, that these examples are given for illustrative purpose only and not intended to limit the scope of the present invention. Comparative Example 1 LiCoO2 as a positive active material, a carbon material as a negative active material, and 1M LiPF6 solution with a composition of EC: DEC =1 : 1, as an electrolyte, were used. To the electrolyte, O.1% by weight of aluminum iodide was added, and the resulting electrolyte was introduced into a 7OO-mAh lithium-ion polymer battery, thus fabricating a battery. The fabricated lithium-ion polymer battery was subjected to a cycle life test in which the battery was charged to 4.2 V at a current of 7OO mA in a constant current/constant vcltage mode, cut-off upon the reduction of current to 5O mA, discharged at a current of 7OO mA in a constant current mode, and cut-off at 3 V. Comparative Example 2 A lithium-ior; polymer battery was fabricated in the same manner as in Comparative Example 1 except that the aluminum iodide was added to the electrolyte at the amount of O.5% by weight. A cycle life test on the fabricated battery was performed in the same manner as in Comparative Example 1. Comparative Example 3 A lithium-ion polymer battery was fabricated in the same manner as in Comparative Example 1 except that tin iodide in place of the aluminum iodide was added to the electrolyte at the amount of O.1% by weight. A cycle life test on the fabricated battery was performed in the same manner as in Comparative Example 1. Example 1 A lithium-ion polymer battery was fabricated in the same manner as in Comparative: Example 1 except that iodine in place of the aluminum iodide was added to the electrolyte at the amount of O.O5% by weight. A cycle life test on the fabricated battery was performed in the same manner as in Comparative Example 1. Test result 1 FIG. 1 is a graphic diagram showing the comparison of discharge capacity ratio at a range of initial cycle to 4OO cycles between batteries fabricated according to Comparative Examples 1 to 3 and Example 1. As shown in FIG. 1, it could be found that an increase in the amount of addition of the aluminum iodide resulted in a reduction in the battery cycle life (Comparative Examples 1 and 2), and also the addition of the tin iodide resulted in a reduction in the battery cycle life (Comparative Example 3) . However, it could be confirmed that the battery of Example 1 where the iodine had been used at an amount determined in view of the weight ratio of iodine to metal iodide in Comparative Example 1, 3 showed an improvement in the battery cycle life over the case of use of the metal halides Comparative Example 4 LiCoO2 as a positive active material, a carbon material as a negative active material, and 1M LiPF6 solution with a composition of EC: DEC = 1 : 1, as an electrolyte, were used. The electrolyte was introduced into an 800-mAh lithium-ion polymer battery, thus fabricating a battery. The fabricated lithium-ion polymer battery was. subjected to a cycle life test in which the battery was charged to 4.2 V at a current of 800 mA in a constant current/constant voltage mode, cut- off upon the reduction of current to 50 mA, discharged at a current of 8OO mA in a constant current mode, and cut-off at 3 V. Comparative Example 5 A lithium-ion polymer battery was fabricated in the same manner as in Comparative Example 4 except that 2,5- dimethylpyrrole was added to the electrolyte at the amount of 0.2% by weight. A cycle life test on the fabricated battery was performed in the same manner as in Comparative Example 4. Example 2 A lithium-ion polymer battery was fabricated in the same manner as in Comparative .Example 4 except that iodine was added to the electrolyte at the amount of 0.05% by weight. A cycle Life test on the fabricated battery was performed in the saute manner as in Comparative Example 4. Example 3 A lithium-ion polymer battery was fabricated in the same manner as in Comparative Example 4 except that 2,5- dimethylpyrrole and iodine were added to the electrolyte at the amounts of 0.2% by weight and 0.05% by weight, respectively. A cycla life test on the fabricated battery was performed in the same manner as in Comparative Example 4. Test result 2 FIG. 2 is a graphic diagram showing the comparison of discharge capacity ratio at a range of initial cycle to 400 cycles between batteries fabricated according to Comparative Examples 4 and 5 and Examples 2 and 3. As shown in FIG. 2, it could be found that, although the single addition of 2,5- dimethylpyrrole or iodine could have an effect on the improvement of discharge capacity ratio (Comparative Example 4 and Example 2), the addition of iodine in combination with 2,5-dimethylpyrrole provided a further improvement in discharge capacity ratio (Example 3) . Example 4 LiCoO2 as a positive active material, a carbon material as a negative active material, and 1M LiPF6 solution with a composition of EC: DEC =1 : 1, as an electrolyte, were used. Iodine was added to the electrolyte at the amount of 0.05 wt%, and the resulting electrolyte was introduced into an 800-mAh 383562-size lithium-ion polymer battery, thus fabricating a battery. Example 5 A lithium-ion polymer battery was fabricated in the same manner as in Example 4 except that the iodine as the electrolyte additive was added at the amount of 0.2 wt%. Comparative Example 6 A lithium-ion polymer battery was fabricated in the same manner as in Example 4 except that the iodine as the electrolyte additive was not added. Comparative Example 7 A lithium-ion polymer battery was fabricated in the same manner as in Example 4 except that aluminum iodide in place of the iodine was. added at the amount of 0.5 wt%. High-temperature storage test The 800-mAh 383562-size lithium ion polymer batteries fabricated in Examples 4 and 5 and Comparative Examples 6 and 7 were fully charged to 4.2 V at a current of 500 mA in a constant current/constant voltage mode, and cut-off when the current was reduced :0 50mA. The resulting lithium ion polymer batteries were placed in an oven and subjected to a high-temperature storage test which comprises the following three steps: elevating the oven temperature from ambient temperature to 90 °C for 1 hour, storing the batteries at 90 °C for 4 hours, and lowering the oven temperature to ambient temperature for 1 hour. During the high-temperature storage test, a change in the thickness of the batteries was observed. The results are shown in Table 1 below and FIG. 3. Table 1 shows the battery capacities at 0.2C rate before and after the high-temperature storage test. As evident from Table 1, the capacity recovery rates before and after the high-temperature storage test were higher in Examples 4 and 5 and Comparative Example 7 than those in Comparative Example 6. Furthermore, FIG. 3 shows a change in the thickness of the lithium-ion polymer batteries during the high-temperature storage test. As shown in FIG. 3, an increase in the thickness of the batteries fabricated in Examples 4 and 5 and Comparative Example 7 was lower than that of Comparative Example 6, and the increase in the battery thickness was lower in Example 5 and Comparative Example 7 than that in Example 4. As described above, this is because the iodine was adsorbed on the positive or negative electrode so as to inhibit the side reaction between an electrolyte oxide formed at high temperature and the positive or negative electrode, thus inhibiting the generation of gas. Also, an increase in the amount of addition of the iodine showed an increase in the effect of the iodine. It is thought that the case of the aluminum iodide showed an improvement by an increase in the addition amount thereof. the negative active material b) is carbon, lithium metal or alloy. We claim : 1. A nonaqueous electrolyte for batteries, containing a lithium salt and a liquid electrolyte compound, wherein the nonaqueous electrolyte further comprises halogen selected from the group consisting of iodine, chlorine, bromine and a mixture of two or more thereof. 2. The nonaqueous electrolyte as claimed in claim 1, wherein the nonaqueous electrolyte optionally comprises pyrrole or its derivative; and the pyrrole derivative is selected from the group consisting of 2,5-dimethylpyrrole, 2,4-dimethylpyrrole, 2-acetyl N-methylpyrrole, 2-acetylpyrrole, N- methylpyrrole, and a mixture of two or more thereof. 3. The nonaqueous electrolyte as claimed in claim 1 or 2, wherein the content of the halogen is 0.005-1% by weight. 4. The nonaqueous electrolyte as claimed in claim 2, wherein the conten: of the pyrrole or its derivative is 0.01-0.5% by weight. 5. The nonaqueous electrolyte as claimed in claim 1 or 2, which comprises a the lithium salt selected from the group consisting of LiCl04, LiCF3SO3, LiPF6, LiBF4, LiAsF6, and LiN (CF3SC2)2, a mixture of two or more thereof. 6. The nonaqueous electrolyte as claimed in claim 1 or 2, wherein the electrolyte contains: a cyclic carbonate selected from the group consisting of ethylene carbonate (EC), propylene carbonate (PC), gamma- butyrolactone (GBL) and a mixture of two or more thereof; or a linear carbonate selected from the group consisting of diethyl carbonate (DEC), dimethyl carbonate (DMC), ethylmethyl carbonate (EMC), methylpropyl carbonate (MPC) and a mixture of two or more thereof; or both the cyclic carbonate and the linear carbonate. 7. A lithium secondary battery, comprising: a) a positive electrode capable of storing and releasing lithium ions; b) a negative electrode capable of storing and releasing lithium ions; c) a porous separator; and d) a nonaqueous electrolyte containing i) a lithium salt; and ii) a liquid electrolyte compound, wherein the electrolyte is the nonaqueous electrolyte as claimed in any one of claims 1 to 4, 5 and 6 . 8. The lithium secondary battery as claimed in claim 7, wherein the positive active material a) is a lithium transition metal oxide selected from the group consisting of LiCoO2, LiNiO2, LiMn2O4, LiNii-xCoxO2 (0 9. The lithium secondary battery as claimed in claim 7, wherein the negative active material b) is carbon, lithium metal or alloy. The invention discloses a nonaqueous electrolyte for batteries, containing a lithium salt and a liquid electrolyte compound, wherein the nonaqueous electrolyte further comprises halogen selected from the group consisting of iodine, chlorine, bromine and a mixture of two or more thereof. The invention is also for a Lithium Secondary Battery incorporating said electrolyte.

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318-KOLNP-2006-CORRESPONDENCE-1.1.pdf

318-KOLNP-2006-FORM 1-1.1.pdf

318-KOLNP-2006-FORM-27.pdf

318-kolnp-2006-granted-abstract.pdf

318-kolnp-2006-granted-claims.pdf

318-kolnp-2006-granted-correspondence.pdf

318-kolnp-2006-granted-description (complete).pdf

318-kolnp-2006-granted-drawings.pdf

318-kolnp-2006-granted-examination report.pdf

318-kolnp-2006-granted-form 1.pdf

318-kolnp-2006-granted-form 18.pdf

318-kolnp-2006-granted-form 3.pdf

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318-kolnp-2006-granted-reply to examination report.pdf

318-kolnp-2006-granted-specification.pdf

318-KOLNP-2006-LETTER PATENT.pdf