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Lithium ion battery preparation method and lithium ion battery

A lithium-ion battery and lithium salt technology, applied in battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of restricting the use environment of lithium-ion batteries, potential safety hazards, and rapid capacity decay, and improve high-temperature storage performance. , The effect of high residual capacity retention rate and easy process control

Active Publication Date: 2012-07-04
ZHENGZHOU BAK BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal resistance of lithium-ion batteries increases under high temperature conditions, and the capacity decays quickly, especially the serious swelling of the battery, which poses a safety hazard, which greatly limits the use environment of lithium-ion batteries.

Method used

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  • Lithium ion battery preparation method and lithium ion battery
  • Lithium ion battery preparation method and lithium ion battery
  • Lithium ion battery preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A lithium-ion battery with a model number of 083448S and a nominal capacity of 1050mAh was prepared, and the specific preparation steps were as follows.

[0018] 1) Ingredients. The positive electrode active material lithium cobaltate (LiCoO 2 ), positive electrode conductive agent acetylene black (cabot CABOT superconducting carbon black BP2000), positive electrode binder PVDF (model RC10214) and solvent NMP were mixed and stirred evenly to make positive electrode slurry. Among them, the median particle size D50 of lithium cobaltate is 5-15um, and the specific surface area is 0.22-0.90m 2 / g, the tap density is 2.0~3.0g / cm 3 .

[0019] Mix the natural modified graphite coated with negative electrode active material carbon and the negative electrode conductive agent acetylene black, and then uniformly disperse it in the configured aqueous solution of sodium carboxymethylcellulose (CMC), and add styrene-butadiene rubber (SBR) therein as The binder is uniformly stirre...

Embodiment 2

[0037] A lithium-ion battery with a model number of 083448S and a nominal capacity of 1050mAh was prepared, and the specific preparation steps were as follows.

[0038] 1) Ingredients. The positive electrode active material lithium cobaltate (LiCoO 2 ) and doped part of nickel-cobalt lithium cobalt oxide, positive electrode conductive agent acetylene black (using Cabot CABOT superconducting carbon black BP2000), positive electrode binder PVDF (model RC10214) and solvent NMP mixed and stirred evenly to make positive electrode slurry . Among them, the median particle size D50 of lithium cobaltate is 5-15um, and the specific surface area is 0.22-0.90m 2 / g, the tap density is 2.0~3.0g / cm 3 . The doping amount of lithium nickel cobalt cobalt oxide is 0-30wt%.

[0039] Mix the natural modified graphite coated with negative electrode active material carbon and the negative electrode conductive agent acetylene black, and then uniformly disperse it in the configured aqueous solut...

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Abstract

The invention discloses a lithium ion battery and a preparation method of the lithium ion battery. A positive electrode active material is made of lithium cobaltate or lithium cobaltate doped with a part of nickel manganese lithium manganate ternary materials, a negative electrode active material is made of natural modified graphite wrapped by carbon, electrolyte adopts mixed solvent of diethyl carbonate (DEC), ethyl cellulose (EC) and poly carbonate (PC), vinylene carbonate and propylene sulfite annexing agents are added, solid electrolyte interphase (SEI) film is formed preferentially, joint insertion of the organic solvent is restrained, and high temperature performance is excellent. A battery system obviously improves high temperature storage property of the battery on the premise of meeting safety performance, high and low temperature discharge performance and circulation performance of a conventional lithium ion battery. The preparation method is simple, manufacture procedures are easy to control, and the lithium ion battery is easy to popularize and apply.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of good safety performance, high energy density, high specific power, good cycle performance, no memory effect, and no pollution. They are widely used in mobile phones, digital cameras, notebook computers, GPS and other fields. In recent years, as the functions of electronic digital products have become more and more abundant, the applications have become more and more popular, and the use environment has become more and more extensive. The requirements of digital products on the energy carrier-battery have become higher and higher, and the requirements for high-temperature performance higher. However, the internal resistance of lithium-ion batteries increases under high temperature conditions, and the capacity decays quickly, espec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/1391H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 赵付双
Owner ZHENGZHOU BAK BATTERY CO LTD
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