A kind of lithium ion battery electrolyte and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of materials, can solve problems such as narrow chemical window, easy decomposition, and battery deterioration, and achieve the effects of improving cycle life, suppressing internal resistance increase, and suppressing battery swelling

Active Publication Date: 2021-10-01
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used carbonate solvents have a narrow electrochemical window and are easy to decompose under high voltage. At the same time, the reaction between the positive electrode and the electrolyte will also increase, which will eventually lead to the deterioration of the battery.

Method used

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  • A kind of lithium ion battery electrolyte and application thereof
  • A kind of lithium ion battery electrolyte and application thereof
  • A kind of lithium ion battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The non-aqueous organic solvents are fluoroethylene carbonate, diethyl carbonate, and ethyl methyl carbonate, and the three account for 30%, 20%, and 34.5% of the total mass of the electrolyte respectively; the lithium salt is LiPF 6 , and the lithium salt accounts for 12.5% ​​of the total mass fraction of the electrolyte, the additive lithium difluorooxalate borate accounts for 0.3% of the total mass of the electrolyte, and the additive is 1,3-propane sultone accounts for 1% of the total mass of the electrolyte The percentage is 1%, the percentage of the additive biphenyl accounting for the total mass of the electrolyte is 0.2%, the percentage of the additive 1,3,6-hexanetrinitrile accounting for the total mass of the electrolyte is 1%, the additive The percentage of the total mass of the electrolyte is 0.5%.

Embodiment 2

[0048] The non-aqueous organic solvents are fluoroethylene carbonate, diethyl carbonate, and ethyl methyl carbonate, and the mass ratios of the three to the electrolyte are 30%, 20%, and 34% respectively; the lithium salt is LiPF 6 , and the lithium salt accounts for 12.5% ​​of the total mass fraction of the electrolyte; the additive lithium difluorooxalate borate accounts for 0.3% of the total mass of the electrolyte, and the additive is 1,3-propane sultone accounts for 1% of the total mass of the electrolyte The percentage is 1%, the percentage of the additive biphenyl accounting for the total mass of the electrolyte is 0.2%, the percentage of the additive 1,3,6-hexanetrinitrile accounting for the total mass of the electrolyte is 1%, the additive The percentage of the total mass of the electrolyte is 1%.

Embodiment 3

[0050] The non-aqueous organic solvents are fluoroethylene carbonate, diethyl carbonate, and ethyl methyl carbonate, and the three account for 30%, 20%, and 33.5% of the total mass of the electrolyte respectively; the lithium salt is LiPF 6 , and the lithium salt accounts for 12.5% ​​of the total mass fraction of the electrolyte; the additive lithium difluorooxalate borate accounts for 0.3% of the total mass of the electrolyte, and the additive is 1,3-propane sultone accounts for 1% of the total mass of the electrolyte The percentage is 1%, the percentage of the additive biphenyl accounting for the total mass of the electrolyte is 0.2%, the percentage of the additive 1,3,6-hexanetrinitrile accounting for the total mass of the electrolyte is 1%, the additive The percentage of the total mass of the electrolyte is 1.5%.

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Abstract

The present invention relates to a kind of electrolyte solution of lithium ion battery, comprises solvent, lithium salt and additive, and described additive comprises lithium difluorobismalonate phosphate shown in structural formula (1) and derivative thereof and / or as shown in structural formula ( 2) Lithium tetrafluoromalonate phosphate and derivatives thereof; (2); wherein, Rx, Ry, and Rz independently represent an oxygen atom, or R1, R2, R3, R4, R5, R6, R7, R8 independently represents a hydrogen atom, a halogen atom, an alkyl group containing 1 to 12 carbon atoms, a haloalkyl group, an alkoxy group, a cyano group, an amino group or a nitro group, n is an integer of 1 to 12, and a and b are independently It is an integer of 1 to 6. The invention can greatly improve the cycle life of the 5V high-voltage positive electrode material lithium-ion battery at a relatively high voltage of 4.85V, suppress battery swelling and internal resistance increase, and pass the battery in a fully charged state without explosion and fire. Safety test.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium-ion battery electrolyte and an application thereof. Background technique [0002] In recent years, lithium-ion batteries have gradually replaced traditional batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride due to their high energy density, long cycle life, and environmental friendliness. However, with the development of portable electronic products in the direction of miniaturization and multi-function, the energy density requirements of lithium-ion batteries are getting higher and higher, and increasing the working voltage of lithium-ion batteries is one of the most effective ways to increase their energy density. The currently commonly used carbonate solvents have a narrow electrochemical window and are easy to decompose under high voltage. At the same time, the reaction between the positive electrode and the electrolyte will also in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 陈黎甘朝伦秦虎王婷婷
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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