Lithium ion battery electrolyte and battery thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of not greatly improving battery power density and restricting the development of high-power lithium-ion batteries, and achieve good cycle stability, small charge transfer resistance, and improved Effects of discharge performance and high and low temperature performance

Inactive Publication Date: 2021-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current research work is aimed at modifying materials, but it has not substantially improved the power density of the battery. The electrolyte of lithium-ion batteries basically determines the high-rate performance of the battery, which restricts the development of high-power lithium-ion batteries. The essential! Improving the ionic conductivity of the electrolyte is an important direction to improve the power characteristics of the battery.

Method used

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  • Lithium ion battery electrolyte and battery thereof
  • Lithium ion battery electrolyte and battery thereof
  • Lithium ion battery electrolyte and battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The electrolyte lithium salt is LiPF 6 , the concentration of lithium salt in the electrolyte is 1.0mol / L; the solvent is mixed by ethylene carbonate, dimethyl carbonate, methyl acetate and fluoroethylene carbonate in a volume ratio of 25:5:65:5; the additive For vinylene carbonate and vinyl sulfate, the mass fractions were 2% and 1%.

Embodiment 2

[0052] Electrolyte lithium salt made of LiPF 6 It is mixed with LiFSI at a mass ratio of 1:1, and the concentration of lithium salt in the electrolyte is 1.0mol / L; the solvent is composed of ethylene carbonate, ethyl acetate, ethyl propionate and fluoromethyl methyl carbonate according to The volume ratio is 25:35:35:5; the additives are vinylene carbonate, 1,3-propenyl-sultone and vinyl sulfate, and the mass fractions are 1%, 2% and 1% respectively.

Embodiment 3

[0054] This example is basically the same as Example 1, except that the solvent is formed by mixing ethylene carbonate, dimethyl carbonate, methyl acetate and methyl difluoroacetate in a volume ratio of 30:10:40:20.

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Abstract

The invention discloses a lithium ion battery electrolyte and a battery thereof, and belongs to the field of lithium ion batteries. The electrolyte comprises a lithium salt and an organic solvent; the organic solvent comprises a linear ester compound and a halogenated ester compound, wherein the volume fraction of the linear ester compound in the electrolyte is 40-90%. According to the lithium cobalt oxide battery provided by the embodiment of the invention, at room temperature, the 30C discharge specific capacity is more than 120mAh / g, and the highest discharge specific capacity can reach 137mAh / g; the 50C discharge specific capacity is more than 100mAh / g, and the highest discharge specific capacity can reach 129mAh / g; the 80C discharge specific capacity can reach more than 90mAh / g, and the highest discharge specific capacity can reach 116mAh / g; and the 100C discharge specific capacity can reach more than 70mAh / g, and the highest discharge specific capacity can reach 102mAh / g.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte and a battery thereof. Background technique [0002] In recent years, aviation, catapult systems, and highly directed energy devices represented by lasers have shown an urgent demand for ultra-high-power chemical power sources, and research on ultra-high-power chemical power sources has also been carried out internationally. This type of application has extremely high requirements for the high power, high specific energy and long life of the supporting pulse power supply, and it is difficult for general chemical power supplies to meet its requirements. Lithium-ion batteries have the advantages of high voltage, specific energy, high cycle life, etc. With the rapid development of battery key materials and battery manufacturing technology, the specific power, specific energy, cycle life, and safety performance of high-power lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/0525
CPCH01M10/0585H01M10/0525H01M2300/0037Y02P70/50Y02E60/10
Inventor 马荻张洪章李先锋张华民国海鹏石琛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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