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An electrolyte and a lithium-ion battery

An electrolyte and electrolyte technology, which is applied in the field of electrolyte, can solve the problems of lithium-ion battery capacity safety impact, accelerate electrolyte decomposition, and cracks in pole pieces, etc., and achieve the effects of reducing self-discharge, reducing dissolution, and inhibiting erosion

Active Publication Date: 2021-05-18
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-nickel ternary cathode materials have strong water absorption and low stability. Especially under high temperature conditions, the catalytic action of nickel will accelerate the decomposition of the electrolyte, resulting in oxidation of the electrolyte, gas production, and cracks and dissolution of the electrode. Transition metal ions such as manganese and cobalt can also damage the SEI film on the negative electrode, which seriously affects the capacity, cycle and safety of lithium-ion batteries in high-temperature environments.

Method used

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  • An electrolyte and a lithium-ion battery
  • An electrolyte and a lithium-ion battery
  • An electrolyte and a lithium-ion battery

Examples

Experimental program
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Effect test

Embodiment

[0041] 1) Preparation of electrolyte

[0042] The electrolyte solution of embodiment 1~10 and comparative example 1~4 is prepared according to the following method:

[0043] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate to a molar concentration of 1.0mol / L, the additive includes additive A and additive B, the additive type and its content in the embodiment and the comparative example electrolyte are shown in Table 1, wherein the ratio of the additive is the ratio accounting for the total weight of the electrolyte;

[0044] Table 1 Embodiment 1~10 and the additive of comparative example 1~4 and its content data table

[0045]

[0046]

[0047] 2) Preparation of positive electrode sheet

[0048] Mix high-nickel ternary cathode material (NCM811), Super-P, CNT and PVDF according to the mass ratio of 96:1.5:1:1.5, and then disperse them in NMP, ...

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Abstract

The invention provides a kind of electrolytic solution, comprise electrolyte lithium salt, non-aqueous organic solvent and additive, described additive is made up of additive A and additive B; Said additive A is selected from the compound shown in formula (I) and formula ( One or two of the compounds shown in II); the additive B is a compound containing an oxalate group. The present application also provides a lithium ion battery. The electrolyte provided by the application can be matched with the high-nickel ternary positive electrode material, which can significantly improve the normal temperature cycle, high temperature cycle and high temperature storage performance of the lithium ion battery, and greatly reduce the gas production during the high temperature storage process.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] In recent years, global new energy vehicles have achieved rapid development, and the application of lithium-ion batteries in the field of power batteries has become more and more common. With the increase of the cruising range of electric vehicles and the inclination of the national subsidy policy, the requirements for the energy density of power batteries are also getting higher and higher. [0003] Generally speaking, a high-nickel ternary cathode material is a ternary material with a nickel mole fraction greater than 0.6. This kind of material has the characteristics of high specific capacity and low cost. Therefore, the development of a high-nickel ternary cathode material system is an increasing One of the important ways of battery energy density. However, high-nickel ternary cathode mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 王海军熊俊俏齐士博陈小平
Owner SOUNDON NEW ENERGY TECH CO LTD
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