A kind of lithium ion battery electrolyte and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of materials, can solve the problems of battery performance damage and long industrialization process, and achieve the effects of high wettability and good high-temperature output characteristics

Active Publication Date: 2021-10-01
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries are more and more widely used in people's production and life, which makes its safety issues become the focus of attention. The solution to lithium-ion battery safety issues in terms of electrolytes: Approach 1: Research on electrolytes for all-solid-state lithium-ion batteries, It is still in the research and development stage, immature, and the road to industrialization is still very long; Approach 2: Improve the electrolyte system of the existing lithium-ion battery, that is, use flame retardant or even non-flammable solvents (fluorine-containing solvents) or flame retardants One of the most promising ways to solve the flammability problem of electrolytes in lithium-ion batteries at present, they have less damage to battery performance and the effect of inhibiting electrolyte combustion is obvious

Method used

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  • A kind of lithium ion battery electrolyte and application thereof
  • A kind of lithium ion battery electrolyte and application thereof
  • A kind of lithium ion battery electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] in an argon-filled glove box (H 2 O6 ) in it, and then add 0%, 0.01%, 0.05%, 0.1%, 0.5% perfluoroalkyl alcohol polyoxyethylene ether of the total amount of electrolyte to the electrolyte.

[0032] Test the contact angle of each electrolyte on the artificial graphite negative electrode material, diaphragm and ternary positive electrode material, select the ternary graphite battery to form the battery with 0.1C charge and discharge, and test the normal temperature cycle performance of the battery. Test results such as figure 1 and figure 2 shown.

Embodiment 2

[0034] in an argon-filled glove box (H 2 O6 ) in it, and then respectively add 0%, 0.1%, and 0.5% perfluoroalkyl alcohol polyoxyethylene ethers of the total amount of the electrolyte to the electrolyte solution.

[0035] Test the contact angle of each electrolyte on the artificial graphite negative electrode material, such as image 3 shown.

Embodiment 3

[0037] in an argon-filled glove box (H 2 O2 f) 2 ) to this electrolyte solution, 0.1% of the total electrolyte solution perfluoroalkyl alcohol polyoxyethylene ether, 1% of the total electrolyte solution vinylene carbonate, and 1% lithium difluorophosphate were added.

[0038]A nickel-cobalt-aluminum-graphite battery is selected, and the battery is formed by charging and discharging at 0.1C, and the first charge and discharge efficiency is measured, and a high temperature cycle of 45°C is performed. The test results are shown in Table 1 and Figure 4 shown.

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PUM

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Abstract

The present invention relates to a kind of lithium-ion battery electrolyte, comprise solvent, lithium salt and additive, described additive comprises the fluorine-containing nonionic surfactant shown in structural formula (1), wherein R 1 , R 3 Independently selected from fluoroalkyl, fluoroalkoxy, fluorophenyl, fluorophenoxy and fluorogroups composed of O, S, N and P, wherein fluoro is fully substituted or partially substituted; R 2 are independently selected from alkyl groups, alkoxy groups, groups consisting of O, S, N and P, and n is an integer of 3-12. The lithium-ion battery electrolyte of the invention has high wettability, and the lithium-ion battery using the electrolyte has good high-temperature output characteristics, rate and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a lithium-ion battery electrolyte and an application thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in people's production and life, which makes its safety issues become the focus of attention. The solution to lithium battery safety issues in terms of electrolytes: Approach 1: Research on electrolytes for all-solid-state lithium-ion batteries, It is still in the research and development stage, immature, and the road to industrialization is still very long; Approach 2: Improve the electrolyte system of the existing lithium-ion battery, that is, use flame retardant or even non-flammable solvents (fluorine-containing solvents) or flame retardants One of the most promising ways to solve the flammability problem of electrolytes in lithium-ion batteries at present is that they have less damage to battery performance and have a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 陈晓琴甘朝伦张力顾名遥
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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