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Lithium ion battery nonaqueous electrolyte and lithium ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of easy leakage, expansion of negative electrode material layer, combustion and explosion, etc.

Active Publication Date: 2018-07-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries are widely cited for their advantages of high voltage, high capacity, low consumption, no memory effect, pollution-free, and small size; however, the electrolyte of lithium batteries contains volatile, low-flash point organic solvents. Overcharge, short circuit, impact and other extreme conditions are prone to leakage, which will cause the danger of combustion and explosion. Aiming at this problem, the industry has done a lot of research on circuit protection, system control and ceramic diaphragm to improve the overall safety performance of the battery; in addition Adding a flame retardant to the non-aqueous electrolyte is also an important and effective way to solve this technical problem. Domestic and foreign enterprises and scientific research institutions have also conducted a lot of research on this; currently the most widely studied is the addition of triphosphate Methyl ester, triethyl phosphate, tributyl phosphate, triphenyl phosphate, etc. are added to the electrolyte as additives to achieve a flame-retardant effect, thereby improving the safety performance of the battery as a whole; and this type of phosphate is used as an electrolyte additive , there will be problems of expansion and shedding of the negative electrode material layer, which will seriously affect the performance of the battery when used in large quantities

Method used

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  • Lithium ion battery nonaqueous electrolyte and lithium ion battery
  • Lithium ion battery nonaqueous electrolyte and lithium ion battery
  • Lithium ion battery nonaqueous electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of non-aqueous electrolyte:

[0047] Configure the electrolyte in the glove box, control the oxygen content in the glove box<2ppm, fill the glove box with nitrogen and control the purity of nitrogen in the glove box to be 99.999%, take 30g ethylene carbonate, 30g diethyl carbonate, 30g carbonic acid Ethyl methyl ester, 2g of fluoroethylene carbonate (FEC), 2g of vinylene carbonate (VC) are mixed, then 15g of lithium hexafluorophosphate and 10g of tris (4-trifluoroethylcarboxyphenyl) phosphate are added and mixed evenly to prepare Non-aqueous electrolyte, denoted as C1;

[0048] (2) Preparation of lithium ion battery:

[0049] Will LiNi 0.5 co 0.2 mn 0.3 o 2 , acetylene black, and polyvinylidene fluoride are mixed uniformly with the positive electrode solvent N-methylpyrrolidone at a weight ratio of 85:10:5 to prepare a positive electrode slurry, which is then coated on an aluminum foil, dried and rolled to prepare a positive electrode sheet; Graphi...

Embodiment 2

[0051] Adopt the same method as Example 1 to prepare non-aqueous electrolyte and lithium ion battery, the difference is that in step (1), 10g of tris (4-trifluoroethoxyphenyl) phosphate is used instead of tris (4-trifluoroethoxyphenyl) phosphate Fluoroethylcarboxyphenyl) phosphate to prepare non-aqueous electrolyte solution C2 and lithium-ion battery S2.

Embodiment 3

[0053] Adopt the method identical with embodiment 1 to prepare non-aqueous electrolytic solution and lithium ion battery, difference is, adopt 10g three (4-trifluoroethoxyphenyl) phosphites to replace three (4- Trifluoroethylcarboxyphenyl) phosphate to prepare non-aqueous electrolyte solution C3 and lithium-ion battery S3.

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Abstract

The invention provides a lithium ion battery nonaqueous electrolyte and a lithium ion battery, wherein the nonaqueous electrolyte includes an organic solvent, lithium salt and an additive being one ormore selected from the phosphate compounds represented in the formulas (1), (2) and (3). When the phosphate compounds are added to the electrolyte, excellent flame retarding effect is achieved, and auniform protective film can be formed on the surface of a negative electrode material layer by means of the phosphate, thus preventing expansion and falling off of the negative electrode material layer. The nonaqueous electrolyte not only enhances security of the battery but also greatly improves the cycle performance of the battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a nonaqueous electrolytic solution for a lithium ion battery and a lithium ion battery containing the nonaqueous electrolytic solution. Background technique [0002] Lithium-ion batteries are widely cited for their advantages of high voltage, high capacity, low consumption, no memory effect, pollution-free, and small size; however, the electrolyte of lithium batteries contains volatile, low-flash point organic solvents. Overcharge, short circuit, impact and other extreme conditions are prone to leakage, which will cause the danger of combustion and explosion. Aiming at this problem, the industry has done a lot of research on circuit protection, system control and ceramic diaphragm to improve the overall safety performance of the battery; in addition Adding a flame retardant to the non-aqueous electrolyte is also an important and effective way to solve this technical problem. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 任建新王圣黄荣刚
Owner BYD CO LTD
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