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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion battery electrolyte and lithium-ion batteries, can solve the problems of not being able to effectively improve the performance of the battery’s hot box and low-temperature performance, and achieve improved material stability, reduced positive electrode interface impedance, The effect of improving stability

Active Publication Date: 2022-03-11
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention is to provide an electrolyte solution for lithium-ion batteries to solve the problem that the current electrolyte solution cannot effectively improve the battery’s hot box performance and low-temperature performance. The electrolyte solution of the present invention can also improve cycle performance and storage. performance

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

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Embodiment 1

[0047] A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte spaced between the positive electrode sheet and the negative electrode sheet, wherein the positive electrode sheet uses lithium cobaltate as the positive electrode active material, and the negative electrode sheet uses graphite as the Negative electrode active material, the diaphragm is a polypropylene diaphragm.

[0048] Preparation of electrolyte: In a glove box filled with argon, mix ethylene carbonate, propylene carbonate, and diethyl carbonate in a mass ratio of EC:PC:DEC=1:1:3, and then slowly add to the mixed solution Add 14.5wt% lithium hexafluorophosphate (LiPF 6) and 0.5wt% lithium difluorooxalate borate (LiODFB), and finally add 0.2wt% of the first additive with the structure shown in formula I based on the total weight of the electrolyte, 0.2wt% of the second additive with the structure shown in formula II, 6wt% % fluoroethylene carbonate...

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Abstract

The invention provides a lithium ion battery electrolyte and a lithium ion battery, the lithium ion battery electrolyte comprises a lithium salt, an organic solvent, a first additive and a second additive, the first additive has a structural formula as shown in formula I; the second additive has a structural formula as shown in a formula II; the two additives have a synergistic effect and generate stable and low-impedance interfacial films on the surfaces of a positive electrode and a negative electrode respectively, so that the hot box performance and the low-temperature performance of the battery are improved, and meanwhile, the cycle performance and the storage performance of the battery are both improved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used because of their high working voltage, high specific energy, long cycle life and no memory effect. At present, lithium-ion batteries have been widely used in 3C digital consumer electronics products and power batteries and other fields. As the "blood" of lithium-ion batteries, electrolyte is one of the important components of lithium-ion batteries. It plays a role in transporting lithium ions between the positive and negative electrodes and plays a vital role in the performance of lithium-ion batteries. [0003] The currently used electrolyte generally includes solvents, lithium salts and additives, which play an important role in the low temperature, cycle, storage and safety performance of lithium-ion batteries. However, the current electrolyte stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 李希平熊伟马斌陈杰杨山
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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