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A kind of high-voltage lithium-ion battery electrolyte and its additive

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of single effect and few types, and achieve the effects of protecting stability, improving high temperature performance and increasing energy density

Active Publication Date: 2022-05-13
HUZHOU KUNLUN YIENKE BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are few types of electrolytes for high-voltage lithium-ion batteries, and the effect is single

Method used

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  • A kind of high-voltage lithium-ion battery electrolyte and its additive
  • A kind of high-voltage lithium-ion battery electrolyte and its additive
  • A kind of high-voltage lithium-ion battery electrolyte and its additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-voltage lithium-ion battery electrolyte, including 1mol / L LiPF 6 , non-aqueous organic solvents and additives.

[0033] The non-aqueous organic solvent is a 1:1:1 mixture of EC:DMC:PC.

[0034] Additives include 2% VC, 1.5% LiTFSI and 0.5% BN in total mass fraction.

[0035] The liquid-injected battery cell to be dehydrated is obtained by pre-processing such as stirring, coating, and winding, in which the positive electrode is lithium cobaltate (LiCoO 2 ), and the negative electrode is graphite. The electrolyte is poured into it to prepare a lithium-ion battery.

Embodiment 2

[0037] A high-voltage lithium-ion battery electrolyte, including 1mol / L LiPF 6 , non-aqueous organic solvents and additives.

[0038] The non-aqueous organic solvent is a 1:1:1 mixture of EC:DMC:PC.

[0039] Additives include 2% VC, 3.0% LiTFSI and 1.0% BN in total mass fraction.

[0040] The liquid-injected battery cell to be dehydrated is obtained by pre-processing such as stirring, coating, and winding, in which the positive electrode is lithium cobaltate (LiCoO 2 ), and the negative electrode is graphite. The electrolyte is poured into it to prepare a lithium-ion battery.

Embodiment 3

[0042] A high-voltage lithium-ion battery electrolyte, including 1mol / L LiPF 6 , non-aqueous organic solvents and additives.

[0043] 1:1:1 EC:DMC:PC mixture of non-aqueous organic solvents.

[0044] Additives include 2% VC, 9.0% LiTFSI and 3.0% BN in total mass fraction.

[0045] The liquid-injected battery cell to be dehydrated is obtained by pre-processing such as stirring, coating, and winding, in which the positive electrode is lithium cobaltate (LiCoO 2 ), and the negative electrode is graphite. The electrolyte is poured into it to prepare a lithium-ion battery.

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Abstract

The invention discloses an electrolyte solution for a high-voltage lithium-ion battery, comprising a non-aqueous organic solvent, a lithium salt and an additive, wherein the additive comprises vinylene carbonate and bis(trifluoromethylsulfonyl)imide A mixture prepared from lithium and benzonitrile; vinylene carbonate accounts for 1 to 10% by mass of the electrolyte, and the mixture accounts for 1 to 20% by mass of the electrolyte; wherein, in the mixture, bis(trifluoromethylsulfonyl ) The mass ratio of lithium imide and benzonitrile is 3:1. The invention is used in lithium-ion batteries, and can form a stable solid electrolyte interface film on the surface of the positive electrode and negative electrode materials of the high-voltage lithium-ion battery, effectively protect the stability of the positive and negative electrode materials in the cycle process, and further greatly improve the performance of the lithium-ion battery. High energy density, effectively improving the high temperature performance of lithium-ion batteries.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to electrolytes and additives used in the production of lithium-ion batteries. Background technique [0002] Lithium-ion battery, as a new type of green energy, has made remarkable progress since 1990. Due to the advantages of high energy density, high power density, long cycle life and low price, lithium-ion batteries are widely used in daily life. However, whether it is a portable device or a means of transportation, the energy density of lithium-ion batteries is increasingly required. In order to meet the needs of consumers, it is imminent to develop new electrode materials and electrolyte systems to improve the energy density of lithium-ion batteries. [0003] One way to increase the energy density of lithium-ion batteries is to choose high-capacity positive and negative electrode materials, and another way is to increase the working voltage of the battery. At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCY02E60/10Y02P70/50
Inventor 柴茂荣郭营军郭连晓张和平
Owner HUZHOU KUNLUN YIENKE BATTERY MATERIAL CO LTD
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