High-energy-density lithium-ion battery electrolyte

A lithium-ion battery, high energy density technology, applied in the field of lithium-ion batteries, can solve the problems affecting the long-term development of power batteries, hidden dangers of lithium batteries, safety, and unsatisfactory long life, and achieve high anti-oxidation properties and compatibility Good performance and excellent self-extinguishing time

Inactive Publication Date: 2019-02-01
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of traditional electrolytes is not satisfactory in terms of safety and long life, which greatly affects the long-term development of power batteries
[0003] The traditional electrolyte system contains a large amount of flammable carbonate solvents, which leads to great safety hazards for lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high energy density lithium-ion battery electrolyte, the electrolyte is made of raw materials comprising the following weight percentages: LiPF 6 15%, LiFSi 3%, LiBF 2 SO 4 2%, non-aqueous organic solvent 79.5%, LiPO 2 f 2 0.5%; wherein, the non-aqueous organic solvent is ethylene carbonate and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, and the mass ratio is 1:1.

[0040] The preparation method of the high-energy-density lithium-ion battery electrolyte includes the following steps: adding a lithium salt to a non-aqueous organic solvent, adding an additive after stirring evenly, and obtaining the high-energy-density lithium-ion battery electrolyte after stirring evenly .

[0041] The electrolyte is injected into a lithium-ion battery whose positive electrode is NCM622 and the negative electrode contains 5% silicon, and the battery is subjected to cycle performance testing after shelving, pre-charging, formation, and capacity separation in sequence....

Embodiment 2

[0043] A high energy density lithium-ion battery electrolyte, the electrolyte is made of raw materials comprising the following weight percentages: LiPF 6 15%, LiFSi 5%, LiBF 2 SO 4 5%, non-aqueous organic solvent 73%, LiPO 2 f 2 1%, LiDFOP 1%; Among them, non-aqueous organic solvents are ethylene carbonate, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether and fluoroethylene carbonate , the mass ratio is 2:2:1.

[0044] The preparation method of the high-energy-density lithium-ion battery electrolyte includes the following steps: adding a lithium salt to a non-aqueous organic solvent, adding an additive after stirring evenly, and obtaining the high-energy-density lithium-ion battery electrolyte after stirring evenly .

[0045] The electrolyte is injected into a lithium-ion battery whose positive electrode is NCM622 and the negative electrode contains 5% silicon, and the battery is subjected to cycle performance testing after shelving, pre-charging, formation, a...

Embodiment 3

[0047] A high energy density lithium-ion battery electrolyte, the electrolyte is made of raw materials comprising the following weight percentages: LiPF 6 20%, LiFSi 10%, LiBF 2SO 4 5%, non-aqueous organic solvent 59%, LiPO 2 f 2 2%, LiDFOP 2%, LiTFOP 2%; wherein, the non-aqueous organic solvent is ethylene carbonate, ethyl methyl carbonate and methyl difluoroacetate, and the mass ratio is 3:5:2.

[0048] The preparation method of the high-energy-density lithium-ion battery electrolyte includes the following steps: adding a lithium salt to a non-aqueous organic solvent, adding an additive after stirring evenly, and obtaining the high-energy-density lithium-ion battery electrolyte after stirring evenly .

[0049] The electrolyte is injected into a lithium-ion battery whose positive electrode is NCM622 and the negative electrode contains 30% silicon, and the battery is subjected to cycle performance testing after shelving, pre-charging, formation, and capacity separation i...

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Abstract

The invention provides a high-energy-density lithium-ion battery electrolyte prepared from, by weight, 20-60% of lithium salt, 20-60% of a non-aqueous organic solvent and 0.5-10% of an additive, all the components adding to 100%. The lithium salt includes lithium hexafluorophosphate, lithium bifluorosulfonimide and lithium sulfate difluoroborate. The electrolyte is very short in self-extinguishingtime and is even incombustible, wherein the additive has excellent film-forming effect, so that an SEI film, having ultralow resistance and high thermo-stability, can be formed between cathode-anodeinterfaces.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries with high energy density. Background technique [0002] After more than 20 years of development, lithium-ion batteries have put forward higher requirements in terms of energy density, power density, safety, and service life. Therefore, the use of high-nickel positive electrodes and silicon-carbon negative electrode materials is becoming more and more clear. The development of pure electric vehicles provides a broad market prospect for lithium-ion power battery electrolytes. In the development of functional electrolytes, the development of high and low temperature electrolytes is relatively mature, and the environmental adaptability of power batteries has basically been solved. Therefore, power batteries promote the development of electrolytes in the direction of high safety and long life. However, the performance of tradition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235H01M2220/20Y02E60/10Y02P70/50
Inventor 董晶高秀玲申津婧王驰伟
Owner TIANJIN ENERGIES
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