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Lithium ion battery

A lithium-ion battery, voltage technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as affecting cycle life, increasing temperature rise, and increasing battery internal resistance

Inactive Publication Date: 2021-07-16
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adding anti-overcharge additives to the electrolyte usually includes: 1) Adding a redox shuttle pair to the electrolyte to improve overcharge performance, but the oxidation potential of such additives is low (such as about 4.1V), and the high-potential battery charge The performance of the battery will be affected during the discharge cycle; 2) Add biphenyl, terphenyl, or cyclohexylbenzene to the electrolyte, and the above-mentioned substances will undergo electropolymerization during overcharging to block the charging current, but such additives will not be released during the charge-discharge cycle. It will be exhausted gradually, and the internal resistance and temperature rise of the battery will increase due to electropolymerization, which will affect the cycle life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 4990.02 grams of positive electrode active material lithium cobaltate, 9.98 grams of anti-overcharge additive lithium chloride with a particle size of 800nm ​​(mass of lithium cobaltate: quality of lithium chloride is 500:1.0), 160.43 grams of binder A A mixture of vinyl fluoride and 187.17 grams of conductive agent carbon black and vapor-phase grown carbon nanotubes (conductive carbon black: the quality of carbon nanotubes is 1:1) is mixed to obtain positive electrode slurry A; the positive electrode slurry A is coated on a 12 μm The positive electrode of the lithium ion battery is obtained on the surface of the positive electrode current collector aluminum foil. Described negative pole selects artificial graphite for use; Electrolyte is by LiPF 6 A mixed solution prepared by dissolving in a mixture of ethylene carbonate (EC) and diethyl carbonate (DEC), in which LiPF 6 The concentration is 1mol L -1 , the volume ratio of EC:DEC is 1:1; the separator is polyethylene ...

Embodiment 2

[0075] 4761.90 grams of positive electrode active material nickel cobalt lithium manganese oxide (LiNi 0.5 co 0.2 mn 0.3 o 2 ), 238.10 grams of anti-overcharge additive lithium sulfate with a particle size of 20 μm (the mass of nickel-cobalt lithium manganese oxide: the mass of lithium sulfate is 20:1), 160.43 grams of binder A polyvinylidene fluoride copolymer and 187.17 grams A conductive agent, a mixture of conductive carbon black and carbon nanotubes (conductive carbon black: the mass of carbon nanotubes is 1:1) is mixed to obtain positive electrode slurry A; the positive electrode slurry A is coated on the surface of a 12 μm positive electrode current collector aluminum foil to obtain The positive electrode of the lithium ion battery. Described negative pole selects natural graphite for use; Electrolyte is by LiPF 6 A mixed solution prepared by dissolving in a mixture of ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC), in which LiPF ...

Embodiment 3

[0077] 4854.37 grams of positive electrode active material nickel cobalt lithium manganese oxide (LiNi 0.8 co 0.1 mn 0.1 o 2 ), 145.63 grams of a mixture of anti-overcharge additive lithium acetate, lithium nitrate and lithium sulfate with a particle size of 7 μm (mass of lithium acetate: quality of lithium nitrate: quality of lithium sulfate is 1:1:1) (nickel cobalt manganese acid The quality of lithium: the quality of the mixture of lithium acetate, lithium nitrate and lithium sulfate is 100:3), 160.43 grams of binder A polyvinylidene fluoride and the mixture of 187.17 grams of conductive agent carbon nanotubes and acetylene black (carbon nanotubes Quality: the mass of acetylene black is 1:1) and mixed to obtain positive electrode slurry A; the positive electrode slurry A is coated on the surface of a 12 μm positive electrode current collector aluminum foil to obtain the lithium ion battery positive electrode. Described negative electrode selects silicon-carbon compound f...

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Abstract

The invention provides a lithium ion battery. The battery comprises a positive electrode, and the positive electrode comprises an overcharge-preventing additive; and the voltage of the gas formed by decomposition of the overcharge-preventing additive is greater than or equal to 4.5 V. According to the lithium ion battery containing the anti-overcharge additive disclosed by the invention, the battery performance of the lithium ion battery under conventional conditions is not influenced, and the safety of the lithium ion battery under extreme conditions is ensured.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries, especially power lithium-ion batteries, have been vigorously developed by domestic and foreign battery companies and OEMs in the field of new energy electric vehicles because of their significant advantages such as high energy density, high output voltage, and excellent cycle performance. However, electric vehicles are frequently exposed due to safety issues such as smoke, fire and even explosions during the charging process, which mainly involves the overcharging safety performance of lithium-ion batteries. [0003] At present, there are two main methods for lithium-ion battery anti-overcharge protection: the use of electrolyte anti-overcharge additives, or the use of external integrated protection circuits with voltage-sensitive materials. The method of adding anti-overcharge addit...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/42
CPCH01M10/0525H01M10/4235Y02E60/10
Inventor 梅兴志孙娇娇陈金杰王晓亚殷月辉文娟·刘·麦蒂斯
Owner MICROVAST POWER SYST CO LTD