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Negative electrode active material and lithium ion battery with improved high-voltage quick charge cycle performance

A negative electrode active material, lithium ion battery technology, applied in active material electrodes, negative electrodes, secondary batteries, etc., can solve the problems of lithium ion battery fast charge cycle performance, shortened cycle life, and increased cycle expansion problems. Achieve the effect of improving fast charging cycle life and stability, increasing cycle times, and increasing rate performance

Inactive Publication Date: 2020-08-14
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with low voltage, the fast charging cycle performance of lithium-ion batteries under high voltage system is greatly affected, the cycle performance is extremely unstable, and the cycle life is difficult to guarantee
All of these make the application of high-voltage fast-charge lithium-ion batteries severely restricted
[0003] With the improvement of the energy density of lithium-ion batteries and the continuous improvement of the positive electrode voltage system of lithium-ion batteries, and the fast charging performance of mobile phone batteries has become more and more important. When the charging speed of the battery is accelerated, the polarization inside the battery increases. The damage to the positive electrode material is intensified, resulting in high-voltage lithium-ion batteries prone to problems such as accelerated cycle capacity decay at room temperature, shortened cycle life, and aggravated cycle expansion problems, and this phenomenon is further aggravated at high temperatures
These all make the application of high-voltage fast-charging lithium-ion batteries severely limited

Method used

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  • Negative electrode active material and lithium ion battery with improved high-voltage quick charge cycle performance
  • Negative electrode active material and lithium ion battery with improved high-voltage quick charge cycle performance
  • Negative electrode active material and lithium ion battery with improved high-voltage quick charge cycle performance

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preparation example Construction

[0061] The present invention also provides the preparation method of above-mentioned negative electrode active material, and the preparation method of described negative electrode active material comprises the following steps:

[0062] The negative electrode active material is prepared by mixing negative electrode graphite and small-diameter graphite.

[0063] The present invention also provides a lithium ion battery, the lithium ion battery includes a negative electrode sheet, the negative electrode sheet includes a negative electrode active material layer, and the negative electrode active material layer includes the above-mentioned negative electrode active material, a conductive agent and a binding agent .

[0064] In a preferred version of the present invention, the mass percentage of each component in the negative electrode active material layer is:

[0065] 70-99wt% negative electrode active material, 0.5-15wt% conductive agent, 0.5-15wt% binder.

[0066] Preferably, ...

preparation example 1

[0077] The average particle size (D 50 ) is 3-15 μm through spheroidized natural graphite, which is coarsely crushed, sieved and reshaped, and then heated to 2600 ° C. At this temperature, the reshaped natural graphite is graphitized for 10 hours, and then graphitized After the graphite particles are re-sieved, the average particle size (D 50 ) is graphite particles of 8-10 μm.

[0078] The average particle diameter (D 50 ) of graphite particles of 8-10 μm and 50 g of amorphous carbon precursor (phenolic resin) were uniformly mixed, and carbonized at 1000 ° C for 6 hours, and finally obtained a particle size distribution of D 10 = 4.77 μm, D 50 = 8.95 μm, D 90 = 17.5 μm small particle diameter graphite coated with amorphous carbon on the surface.

[0079] The tap density of the prepared small particle diameter graphite is 1.12g / cm 3 , the specific surface area is 2.16m 2 / g, the ultimate compaction density is 1.65g / cm 3 .

preparation example 2

[0081] The average particle size (D 50 ) is 5-30 μm spheroidized natural graphite, undergo a magnetic separation, and then carry out the first coarse crushing and sieving, then heat up to 2600 ° C, and carry out graphitization treatment at this temperature for 10 hours, and the graphite particles are Secondary sieving after pulverization, the prepared particle size distribution is D 10 = 8.39 μm, D 50 = 13.9 μm, D 90 = 23.5 μm negative electrode graphite.

[0082] The tap density of the prepared negative electrode graphite is 1.08g / cm 3 , the specific surface area is 1.15m 2 / g, the ultimate compaction density is 1.73g / cm 3 .

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a negative electrode active material and a lithium ion battery with improved high-voltage quick-charge cycle performance. The negative electrode active material comprises the following components: (a) 50-90wt% of negative electrode graphite; (b) 10-50wt% of small particle size graphite; the particlesize distribution of the negative electrode graphite is as follows: D10=8-12 microns, D50=14-18 microns, and D90 =25-30 microns; the particle size distribution of the small-particle-size graphite is as follows: D10=3-5 mu m, D50=7-9 mu m, and D90=15-20 mu m, wherein the negative electrode graphite is uncoated graphite, and the small-particle-size graphite is coated graphite. By using the negativeelectrode active material, the rate capability of the high-voltage system lithium ion battery can be improved; the quick charge cycle life and the stability of the high-voltage system lithium ion battery at normal temperature can be improved; the quick charge cycle life and the stability of the high-voltage system lithium ion battery at high temperature can be improved; and by adjusting the mixingratio (10-50 wt%) of the small-particle-size graphite, the cycle performance requirement and other performance requirements of the lithium ion battery are met.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative electrode active material and a lithium ion battery including the negative electrode active material with improved high-voltage fast charging cycle performance. Background technique [0002] At present, researchers are gradually increasing investment in lithium-ion battery research. In order to achieve higher energy density of lithium-ion batteries, the research on the voltage system of the positive electrode of lithium-ion batteries has gradually shifted from 4.35V to 4.4V, 4.45V and other higher voltage systems. transition. At the same time, with the popularization of 4G and 5G mobile phones, the mobile phone market has higher and higher requirements for the fast charging capability of mobile phone batteries. At the same time, the demand for cycle life of mobile phone batteries is also increasing. From the previous 0.5C / 0.5C charge-discharg...

Claims

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Application Information

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IPC IPC(8): C01B32/205C01B32/20H01M4/587H01M10/0525
CPCC01B32/20C01B32/205H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 贺伟彭冲施超张保海李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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