Lithium secondary battery electrolyte and lithium secondary battery containing same

A lithium secondary battery, electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of poor ionic conductivity, unable to meet battery performance requirements, poor stability, etc., to reduce mass transfer. resistance, the effect of reducing the resistance of the SEI film and improving the toughness

Inactive Publication Date: 2019-06-07
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current use of a single electrolyte additive has disadvantages such as poor stability or poor ionic conductivity, which still cannot meet the battery performance requirements.

Method used

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  • Lithium secondary battery electrolyte and lithium secondary battery containing same
  • Lithium secondary battery electrolyte and lithium secondary battery containing same
  • Lithium secondary battery electrolyte and lithium secondary battery containing same

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] An electrolyte solution for a lithium secondary battery, comprising an organic solvent, a conductive lithium salt and additives, the additives comprising at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound.

[0022] Further, the amount of the borate compound accounts for 0.01% to 5% of the total mass of the electrolyte, the amount of the phosphate compound accounts for 0.01% to 3% of the total mass of the electrolyte, and the amount of the cyclic sulfate compound The dosage accounts for 0.01%-10% of the total mass of the electrolyte, the conductive lithium salt accounts for 8%-20% of the total mass of the electrolyte of the lithium secondary battery, and the rest is an organic solvent.

[0023] Further, the borate compound is selected from at least one of trimethyl borate, triethyl borate, tripropyl borate, triisopropyl borate, triphenyl borate, tris(trimethylsilane) borate A sort of.

[0024] Further, the phosphate co...

Embodiment 1

[0033] A lithium secondary battery electrolyte, comprising an organic solvent, a conductive lithium salt and additives, the organic solvent accounts for 79.99% of the total mass of the lithium secondary battery electrolyte, and the organic solvent includes a cyclic solvent (ethylene carbonate) and Linear solvent (ethyl methyl carbonate), the mass ratio of the ethylene carbonate and ethyl methyl carbonate is 1:5; the conductive lithium salt is lithium hexafluorophosphate, and the lithium hexafluorophosphate accounts for 8.00% of the total mass of the lithium secondary battery electrolyte ; The additive includes at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound, the borate compound is trimethyl borate, and the trimethyl borate accounts for the electrolyte 0.01% of the total mass; the phosphate compound is oxalic acid phosphate, and the oxalic acid phosphate accounts for 2% of the total mass of the electrolyte; the cyclic sulfur...

Embodiment 2

[0036] A lithium secondary battery electrolyte, comprising an organic solvent, a conductive lithium salt and additives, the organic solvent accounts for 82.99% of the total mass of the lithium secondary battery electrolyte, and the organic solvent includes a cyclic solvent (ethylene carbonate) and Linear solvent (ethyl methyl carbonate), the mass ratio of ethylene carbonate and ethyl methyl carbonate is 2:5; the conductive lithium salt is lithium hexafluorophosphate, and lithium hexafluorophosphate accounts for 12% of the total mass of the electrolyte solution of lithium secondary battery ; The additive includes at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound, the borate compound is tripropyl borate, and the tripropyl borate accounts for the electrolyte 2% of the total mass; the phosphate compound is oxalic acid phosphate, and the oxalic acid phosphate accounts for 3% of the total mass of the electrolyte; the cyclic sulfuri...

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Abstract

In order to improve the high-temperature cycle and the storage performance of a battery and consider a low-temperature performance at the same time, the invention discloses a lithium secondary batteryelectrolyte. The lithium secondary battery electrolyte comprises an organic solvent, a conductive lithium salt and an additive, the additive comprises at least one borate compound, at least one phosphate compound and at least one cyclic sulfate compound. The present invention further discloses a lithium secondary battery containing the lithium secondary battery electrolyte. The present inventionbelongs to the technical field of lithium ion batteries. Through synergistic effect of the borate compound, the phosphate compound and the cyclic sulfate compound, an interface film with low interfaceimpedance and high stability is formed so as to improve the high-temperature performance and consider the low-temperature performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium secondary batteries, and in particular relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery containing the electrolyte solution. Background technique [0002] Due to the advantages of high energy density, high working voltage, low self-discharge rate, and environmental friendliness, lithium secondary batteries are widely used in notebooks, mobile phones, digital cameras, Bluetooth headsets, drones, electric vehicles, and large-scale energy storage. application. However, with the improvement of living standards, people put forward higher requirements for battery life. Therefore, new high-voltage and high-capacity cathode materials, such as high-nickel materials, have been developed for lithium secondary batteries. [0003] At present, problems such as poor cycle stability and high temperature storage expansion have become the biggest challenges for hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0525H01M10/42
CPCY02E60/10
Inventor 廖波李素丽王海王龙徐延铭李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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