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Lithium ion battery

A lithium ion battery and lithium salt technology, which is applied in the manufacture of battery electrodes, secondary batteries, and electrolyte batteries, can solve the problems of poor cycle performance and easy expansion of lithium ion batteries.

Pending Publication Date: 2022-06-03
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a lithium-ion battery that can suppress the negative electrode sheet from being in the cycle process in order to overcome the problems of easy expansion and poor cycle performance of the silicon-based negative electrode material lithium-ion battery in the prior art. Swelling occurs in the middle and significantly improves the cycle performance of lithium-ion batteries

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0099] 1) Preparation of non-aqueous electrolyte

[0100] Ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) were mixed in a weight ratio of EC:DEC:EMC=3:2:5, and then lithium hexafluorophosphate (LiPF) was added to the resulting mixture. 6 ) to the molar concentration of 1 mol / L, and then add compound 1 (note: compound 1 here is compound 1 in the specification, the same below) and 10 wt % of the total electrolyte weight. Ethylene carbonate (FEC);

[0101] 2) Preparation of positive electrode sheet

[0102] The cathode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Conductive agent conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF) are uniformly mixed in a weight ratio of 97:1.4:1.6, and then they are dispersed in N-methyl-2-pyrrolidone (NMP) , to obtain the positive electrode slurry; the positive electrode slurry is evenly coated on both sides of the aluminum foil, the positive electrode slurry is coated on the current...

Embodiment 2-16 and comparative example 1-9

[0110] Carry out according to the method of embodiment 1, the difference is,

[0111] The type and amount of the compound represented by formula (1) added to the electrolyte are different; the amount of FEC is different; the amount of CMC is different; the type of silicon-based material and its weight ratio in the mixture of artificial graphite and silicon-based material are different , wherein, when the addition amount of CMC increases or decreases, the amount of PAA decreases or increases accordingly. For example, when the addition amount of CMC is 0 (ie, no CMC is added), the 1 wt% CMC in Example 1 is replaced by The same amount of PAA; when the addition amount of silicon-based material is 100% by weight, it means that the negative electrode active material does not use graphite material, only silicon-based material is used; when no silicon-based material is added, it means that the negative electrode active material only uses graphite material.

[0112] The specific conten...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm arranged between the positive electrode and the negative electrode and a non-aqueous electrolyte, a negative electrode material of the negative electrode contains a negative electrode active material and a binder, the negative electrode active material contains a silicon-based material, the binder contains sodium carboxymethyl cellulose, and the non-aqueous electrolyte is a non-aqueous electrolyte. The non-aqueous electrolyte contains an organic solvent, a lithium salt and a compound represented by a formula (1), and in the formula (1), R1 is one or more of chain-shaped, cyclic and aromatic groups with 2-20 carbon atoms. According to the lithium ion battery, the expansion of the negative pole piece in the cycle process can be inhibited, and the cycle performance of the lithium ion battery is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used not only in the field of 3C digital products such as mobile phones and notebook computers because of their high operating voltage, wide operating temperature range, high energy density, high output power, no memory effect, and long cycle life. At the same time, it has a broad application market in the fields of new energy vehicles and large-scale energy storage. With the rapid development of new energy sources, the application of non-aqueous electrolyte lithium-ion batteries has also grown by leaps and bounds. However, with the urgent requirement of end users to improve the cruising range of new energy vehicles, it is necessary to further improve the energy density of power batteries. [0003] From the perspective of materials, the main methods to improve the energy de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567H01M10/058H01M10/42H01M4/485H01M4/505H01M4/525H01M4/62
CPCH01M10/0525H01M10/058H01M4/621H01M4/485H01M4/505H01M4/525H01M10/4235H01M10/0566H01M10/0567Y02E60/10Y02P70/50
Inventor 钱韫娴林雄贵胡时光邓永红李红梅孙桂岩
Owner SHENZHEN CAPCHEM TECH
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