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Non-aqueous electrolyte with high temperature characteristics and low impedance, its application and lithium-ion battery

A non-aqueous electrolyte, lithium-ion battery technology, applied in the field of non-aqueous electrolyte and lithium-ion batteries, can solve the problems of large storage DCR growth, high temperature gas production, poor high temperature characteristics, etc., and achieves both rate and high temperature storage. Effect

Active Publication Date: 2021-12-07
远景动力技术(湖北)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current low-impedance electrolyte has poor high-temperature characteristics, more gas production at high temperature, and a greater increase in storage DCR.

Method used

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  • Non-aqueous electrolyte with high temperature characteristics and low impedance, its application and lithium-ion battery
  • Non-aqueous electrolyte with high temperature characteristics and low impedance, its application and lithium-ion battery
  • Non-aqueous electrolyte with high temperature characteristics and low impedance, its application and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of non-aqueous electrolyte:

[0040] Mix EC / EMC / DEC into a non-aqueous organic solvent in a mass ratio of about 3:5:2, and mix the non-aqueous organic solvent with 14wt% LiPF 6 After the aqueous solution is mixed, and relative to 100 parts by weight of the non-aqueous electrolyte, add 1wt% lithium difluorophosphate, 1wt% LiFSi, 1wt% DTD, 1wt% PS, 0.2wt% VC, 0.2wt% TVS, 0.5wtTMSP , so as to obtain a non-aqueous electrolyte. In the obtained non-aqueous electrolyte, the mass fraction of non-aqueous organic solvent is 81.1%, LiPF 6 The mass fraction is 14%.

[0041] 2. Preparation of lithium secondary battery:

[0042]Based on the total weight of the positive electrode material, 97wt% NCM (LiNi x co y mn 1-x-y o 2 , x≥0.3, y≤0.3, 1-x-y≤0.5), 2wt% carbon black as a conductive agent, and 1wt% PVDF as a binder were added to the solvent NMP to make a positive electrode mixture slurry. The positive electrode mixture slurry is coated on the positive electro...

Embodiment 2

[0064] A lithium secondary battery was prepared in the same manner as in Example 1, except that the content of TVS in the non-aqueous electrolyte solution was 0.1 wt%, and the content of TMSP was 0.3 wt%. Specifically, based on the total weight of the non-aqueous electrolyte, the non-aqueous electrolyte is composed of the following mass fraction components:

[0065] Non-aqueous organic solvent 81.4wt% (EC / EMC / DEC is about 3:5:2 by mass ratio), LiPF 6 14wt%, 1wt% lithium difluorophosphate, 1wt% LiFSi, 1wt% DTD, 1wt% PS, 0.2wt% VC, TVS 0.1wt%, TMSP 0.3wt%.

Embodiment 3

[0067] A kind of nonaqueous electrolytic solution is based on its gross weight, and is made up of the component of following mass fraction:

[0068] Non-aqueous organic solvent 89.5wt% (EC / EMC / DEC is about 3:5:2 by mass ratio), LiPF 6 8.7wt%, 0.1wt% lithium difluorophosphate, 0.6wt% LiFSi, 0.3wt% PS, 0.5wt% TVS, 0.3wt% TMSP.

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Abstract

The invention relates to a non-aqueous electrolytic solution with high temperature characteristics and low impedance, its application and a lithium ion battery. The non-aqueous electrolytic solution of the present invention, based on its gross weight, includes the following components in mass fraction: 70-90% of non-aqueous organic solvent, 5-20% of electrolyte lithium salt and additives; based on the total weight of the non-aqueous electrolytic solution As a benchmark, the additives include 0.1-2.5% lithium difluorophosphate, 0.1-2.5% propane sultone, 0.5-3% lithium bisfluorosulfonimide, 0.1-1% tetravinylsilane and three (tri Methylsilyl) phosphate 0.1‑1.5%. The present invention uses TVS as a high-temperature additive, which suppresses the high-temperature gas production and DCR growth of the electrolyte; it is used with TMSP that reduces impedance, and balances the appropriate dosage to offset the increase in initial impedance caused by the addition of TVS, so as to achieve electrolysis liquid to achieve the purpose of both high temperature storage and magnification.

Description

technical field [0001] The invention relates to the technical field of power storage devices, in particular to a non-aqueous electrolytic solution with high temperature characteristics and low impedance, its application and a lithium ion battery. Background technique [0002] In recent years, power storage devices, especially lithium secondary batteries, have been widely used as power sources for small electronic devices such as mobile phones and notebook computers, as power sources for electric vehicles, and for power storage. Among them, in thin electronic devices such as tablet terminals and ultrabooks, as well as in some pure electric new energy vehicles, laminated batteries or prismatic batteries using laminated films such as aluminum laminated films for outer packaging components are often used. Batteries, but these batteries are thin and soft, so they are prone to deformation problems such as expansion due to the generation of gas inside the battery cells, which will ...

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 李轶余乐王仁和
Owner 远景动力技术(湖北)有限公司
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