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Non-aqueous electrolyte and lithium-ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in non-aqueous electrolytes, batteries, electrolytes, etc., can solve problems that need to be improved

Active Publication Date: 2021-09-21
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

Examples

Experimental program
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Effect test

Embodiment 1

[0058] (1) Preparation of non-aqueous electrolyte

[0059] Mix compound A1, ethyl methyl carbonate (EMC), and ethylene carbonate (EC) in a weight ratio of 30:65:5 as a non-aqueous solvent, and then dissolve 1mol / L LiPF 6 and LiFSI as lithium salt, LiPF 6 The weight ratio of LiFSI and LiFSI is 10:1, and it is configured as a non-aqueous electrolyte.

[0060] (2) Preparation of positive pole piece

[0061] The cathode active material LiNi 0.8 co 0.1 mn 0.1 o 2 , 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.

[0062] (3) Preparation of negative pole piece

[0063]Negative electrode active material artificial graphite, conductive agent acetylene black, binder styrene-butadiene rubber, thickener sodium carboxymethyl cellulose i...

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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 and a lithium salt, the non-aqueous solvent includes a carbonate solvent and a high oxidation potential solvent, the lithium salt for LiPF 6 With LiN(FSO 2 ) 2 A mixed lithium salt composed of, wherein, the high oxidation potential solvent is selected from one or more of the compounds represented by formula I and formula II. 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): H01M10/0569H01M10/0568H01M10/0525
CPCH01M10/0569H01M10/0568H01M10/0525H01M2300/0037Y02E60/10H01M10/0567H01M2300/0034H01M4/505H01M4/525H01M2220/20H01M2300/0022H01M2300/0028
Inventor 陈培培付成华冯俊敏梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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