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A kind of high-voltage additive for lithium battery electrolyte, electrolyte and lithium battery

An electrolyte and additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as shortening battery life and battery performance degradation, and achieve enhanced stability, cycle life and high-temperature storage life, and reduce impedance. Effect

Active Publication Date: 2022-06-17
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when studying high-voltage lithium batteries, researchers in the industry found that as the voltage of lithium batteries increases, in the application scenario of high-voltage lithium batteries, the traditional lithium battery electrolyte will not only oxidize and decompose itself, but also interact with the positive electrode. The chemical reaction of the material causes the performance of the battery to deteriorate, which seriously shortens the service life of the battery

Method used

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  • A kind of high-voltage additive for lithium battery electrolyte, electrolyte and lithium battery
  • A kind of high-voltage additive for lithium battery electrolyte, electrolyte and lithium battery
  • A kind of high-voltage additive for lithium battery electrolyte, electrolyte and lithium battery

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Embodiment 1

[0035] This embodiment provides a high-voltage additive A for lithium battery electrolyte:

[0036]

[0037] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In the glove box of ≤2.0ppm, the organic solvents ethylene carbonate (EC), propylene carbonate (PC), fluoroethylene carbonate (FEC), and methyl ethyl carbonate (EMC) are prepared according to the mass ratio EC: PC: FEC: EMC=10:15:5:70 for mixing, then add lithium salt LiPF 6 and LiDFOB for dissolution, where LiPF 6 The content of LiDFOB accounts for 10% of the mass ratio of the solution, the content of LiDFOB is 5%, and then the auxiliary additive vinylene carbonate (VC) is added according to the mass fraction 0.5%, and then 1% of the high-voltage additive A is added to prepare the electrolyte. I.

Embodiment 2

[0039] This embodiment provides a high-voltage additive B for lithium battery electrolyte:

[0040]

[0041] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O2 In the glove box of ≤2.0ppm, the organic solvents ethylene carbonate (EC), propylene carbonate (PC), fluoroethylene carbonate (FEC), and methyl ethyl carbonate (EMC) are prepared according to the mass ratio EC: PC: FEC: EMC=10:15:5:70 for mixing, then adding lithium salt LiPF 6 and LiDFOB for dissolution, where LiPF 6 The content of LiDFOB accounts for 10% of the mass ratio of the solution, the content of LiDFOB is 5%, and then the auxiliary additive vinylene carbonate (VC) is added according to the mass fraction 0.5%, and then 1% of the high-voltage additive B is added to prepare the electrolyte. II.

Embodiment 3

[0043] This embodiment provides a high-voltage additive C for lithium battery electrolyte:

[0044]

[0045] In an argon atmosphere, the environmental index is H 2 O≤0.5ppm, O 2 In the glove box of ≤2.0ppm, the organic solvents ethylene carbonate (EC), propylene carbonate (PC), fluoroethylene carbonate (FEC), and methyl ethyl carbonate (EMC) are prepared according to the mass ratio EC: PC: FEC: EMC=10:15:5:70 for mixing, then adding lithium salt LiPF 6 and LiDFOB for dissolution, where LiPF 6 The content of LiDFOB is 10% of the mass ratio of the solution, the content of LiDFOB is 5%, and then the auxiliary additive vinylene carbonate (VC) is added according to the mass fraction 0.5%, and then 1% of the high-voltage additive C is added to prepare the electrolyte. III.

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Abstract

The invention relates to a high-voltage additive for lithium battery electrolyte, electrolyte and lithium battery. The high-voltage additive is a 2,5-disulfonyl cyanothiophene compound or a 2,5-disulfonyl cyanate thiophene compound, and the structural formula is: wherein, R is a carbon number of 1- 6 alkyl and / or haloalkyl, M is one of nitrile or cyanate.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-voltage additive for a lithium battery electrolyte, an electrolyte and a lithium battery. Background technique [0002] Since commercialization in the 1990s, lithium batteries have been widely used due to their high energy density, high charge-discharge efficiency, small self-discharge, long service life, and environmental friendliness. At present, it has been applied to the fields of consumer electronics, aerospace, military, power tools and electric vehicles. [0003] With the development of technology, whether it is in the field of consumption or power batteries, people have higher and higher requirements for the energy density of lithium-ion batteries. Improving the working voltage of lithium batteries has become one of the technologies to improve the energy density of lithium batteries. [0004] The development of high energy density lithium batteries is cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0567H01M10/0566H01M10/0568H01M10/0569H01M10/0525Y02E60/10
Inventor 高田慧李立飞
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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