Non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte, non-aqueous solvent technology, applied in non-aqueous electrolytes, batteries, electrolytes, etc., can solve problems to be improved, and achieve the effects of improving transfer kinetics, improving overcharge safety, and suppressing side reactions

Active Publication Date: 2021-03-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the above-mentioned non-aqueous electrolyte. For example, in a high-voltage system, the cycle performance, storage performance and safety performance of the above-mentioned non-aqueous electrolyte need to be improved. Safety performance such as overcharge safety and hot box safety of ion batteries also needs to be improved

Method used

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  • Non-aqueous electrolyte and lithium-ion battery
  • Non-aqueous electrolyte and lithium-ion battery
  • Non-aqueous electrolyte and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of non-aqueous electrolyte

[0058] Use compound A1 as a non-aqueous solvent, and then dissolve 1mol / L LiPF 6 As a lithium salt, 0.1% DTD is then added to configure a non-aqueous electrolyte.

[0059] (2) Preparation of positive pole piece

[0060] The cathode active material LiNi 0.5 mn 1.5 o 4 , the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) at a weight ratio of 94:3:3 are fully stirred and mixed in the N-methylpyrrolidone solvent system, and then coated on the current collector Al foil and dried. Cold pressing to obtain the positive electrode sheet.

[0061] (3) Preparation of negative pole piece

[0062] Negative electrode active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethyl cellulose in a weight ratio of 95:2:2:1 are fully stirred and mixed in a deionized water solvent system , coated on the current collector Cu foil, dried, ...

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Abstract

The invention provides a non-aqueous electrolytic solution and a lithium ion battery, the non-aqueous electrolytic solution includes a non-aqueous solvent, a lithium salt and an additive, the non-aqueous solvent is a high oxidation potential solvent, and the additive includes a cyclic sulfuric acid ester. The high oxidation potential solvent is selected from one or more of the compounds represented by formula I and formula II, and the cyclic sulfuric acid ester is selected from one or more of the compounds represented by formula III. The invention can not only improve the electrochemical performance of the lithium ion battery under high temperature and high voltage, improve the safety performance of the lithium ion battery such as overcharge safety, hot box safety, etc., but also ensure that the lithium ion battery has certain dynamic performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nonaqueous electrolytic solution and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and consumer electronics due to their advantages such as high energy density, high output power, long cycle life and low environmental pollution. The current demand for lithium-ion batteries is: high voltage, high power, long cycle life, long storage life and excellent safety performance. [0003] Lithium-ion batteries currently widely use a non-aqueous electrolyte system using lithium hexafluorophosphate as a conductive lithium salt and cyclic carbonate and / or chain carbonate as a solvent. However, there are still many deficiencies in the above-mentioned non-aqueous electrolyte. For example, in a high-voltage system, the cycle performance, storage performance and safety performance of the above-mentioned non-aqueous electrolyte need to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0569H01M10/0567H01M10/0525H01M10/4235H01M2300/0028H01M2300/0025Y02E60/10H01M10/0568H01M2220/20H01M4/505H01M4/525H01M2300/0034H01M2300/0037
Inventor 梁成都付成华陈培培冯俊敏
Owner CONTEMPORARY AMPEREX TECH CO
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