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Preparation method of lithium ion battery and lithium ion battery

A lithium-ion battery and lithium salt technology, which is applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of limiting the use environment of lithium-ion batteries, existing safety hazards, and fast capacity decay, and achieves improved high-temperature storage performance , high residual capacity retention rate, and easy process control

Active Publication Date: 2016-04-27
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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  • Preparation method of lithium ion battery and lithium ion battery
  • Preparation method of lithium ion battery and lithium ion battery
  • Preparation method of lithium ion battery 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 thereof. Lithium cobaltate or a ternary material doped with lithium cobaltate is used as a positive electrode active material, and natural modified graphite coated with carbon is used as a negative electrode active material. Substance, the electrolyte uses a mixed solvent of DEC, EC, and PC, and adds vinylene carbonate and propylene sulfite additives to preferentially form an SEI film, inhibit the co-embedding of organic solvents, and have excellent high-temperature performance. The battery system significantly improves the high-temperature storage performance of the battery on the premise of meeting the safety performance, high-low temperature discharge performance and cycle performance of conventional lithium-ion batteries. The preparation method is simple, the manufacturing process is easy to control, and it is easy for industrial popularization and application.

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 Patents(China)
IPC IPC(8): H01M10/058H01M4/1391H01M10/0567H01M10/0525
CPCY02E60/10Y02P70/50
Inventor 赵付双
Owner ZHENGZHOU BAK BATTERY CO LTD
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