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Electrolyte for high-voltage lithium cobalt oxide battery and lithium cobalt oxide battery

An electrolyte and lithium cobalt oxide technology, applied in the field of materials, can solve the problems of serious battery gas production and electrical performance deterioration, and achieve the effect of ensuring stability and excellent electrical performance

Inactive Publication Date: 2021-03-16
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, people have encountered a series of problems in the process of developing high-voltage lithium cobalt oxide. In the case of using traditional electrolytes, the battery has serious gas production problems, and the electrical performance has deteriorated significantly. Therefore, the development and high-voltage lithium cobalt oxide The electrolyte that matches the material system has become the key

Method used

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  • Electrolyte for high-voltage lithium cobalt oxide battery and lithium cobalt oxide battery

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Experimental program
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Effect test

Embodiment 1

[0035] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box with ≤2.0ppm, the organic solvents ethylene carbonate (EC), propylene carbonate (PC), fluoroethylene carbonate (FEC), and ethyl methyl carbonate (EMC) are mixed according to the mass ratio EC / PC / FEC / Mix at EMC=15 / 10 / 5 / 70, then add lithium hexafluorophosphate to dissolve, prepare an electrolyte base solution with a mass fraction of lithium hexafluorophosphate of 14%, and then set the mass fractions of 0.2%, 0.3%, and 0.3% according to the total mass of the electrolyte. %, 1%, 1%, 1%, add additives VC, DTD, BS, SN, heptafluorobutyric anhydride and difluoro oxalic acid phosphate to the base liquid of the electrolyte to prepare the electrolyte I.

Embodiment 2

[0037] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box of ≤2.0ppm, organic solvents EC, PC, FEC, and EMC were mixed according to the mass ratio EC / PC / FEC / EMC=10 / 15 / 5 / 70, and then lithium hexafluorophosphate was added for dissolution to prepare lithium hexafluorophosphate with a mass fraction of 14% of the electrolyte base solution, and then the mass fractions of the total mass of the electrolyte are 0.2%, 0.3%, 0.3%, 1%, 1%, and 1%. Add additives VC, DTD, BS, SN to the electrolyte base solution , heptafluorobutyric anhydride and difluorooxalic acid phosphate to prepare electrolyte II.

Embodiment 3

[0039] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In a glove box of ≤2.0ppm, mix the organic solvents EC, PC, FEC, and EMC according to the mass ratio EC / PC / FEC / EMC=15 / 10 / 5 / 70, then add lithium hexafluorophosphate to dissolve, and prepare lithium hexafluorophosphate with a mass fraction of 14% of the electrolyte base solution, and then add additives VC, DTD, BS to the electrolyte base solution according to the mass fraction of the total mass of the electrolyte at 0.2%, 0.3%, 0.3%, 2%, 1%, and 1%. , SN, heptafluorobutyric anhydride and difluoro oxalic acid phosphate to prepare electrolyte Ⅲ.

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Abstract

The invention relates to an electrolyte for a high-voltage lithium cobalt oxide battery and a lithium cobalt oxide battery. The electrolyte comprises a lithium salt electrolyte, an organic solvent andan additive; the additives comprise heptafluorobutyric anhydride, vinylene carbonate VC, difluoro oxalic acid phosphate and succinonitrile SN. Vinylene carbonate only participates in formation of a negative electrode SEI film in first formation and forms stable SEI, and heptafluorobutyric anhydride and a difluoro oxalic acid phosphate additive form stable composite CEI containing LiF and inorganic phosphate at a high voltage at a positive electrode, so that the stability of a battery system is ensured, and a lithium cobalt oxide material is stabilized at the same time. Through the interactionof the four additives, the excellent electrical property of the electrolyte under high voltage is realized.

Description

technical field [0001] The present invention relates to the technical field of materials, in particular to an electrolyte for a high-voltage lithium cobalt oxide battery and a lithium cobalt oxide battery. Background technique [0002] Lithium batteries have been widely used in consumer electronics, aerospace, military, power tools and electric vehicles because of their advantages such as high energy density, long service life and environmental friendliness. With the rapid development of its applications, people have higher and higher requirements for the energy density of lithium-ion batteries. [0003] Lithium cobalt oxide has become the main cathode material for consumer electronics lithium batteries because of its high gram capacity, high mass and volumetric energy density. Especially when the charging cut-off voltage was increased from 4.2V to 4.5V, the gram capacity of lithium cobaltate was increased by more than 25%. Therefore, the development of high-voltage lithiu...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/052H01M10/058H01M10/42
CPCH01M10/052H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 高田慧李立飞张文彦
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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