High-voltage electrolyte for lithium ion battery and preparation method of high-voltage electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as failure and poor performance of lithium-ion batteries

Active Publication Date: 2021-07-30
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of poor performance or even failure of the above-mentioned lithium-ion battery in a high-voltage environment, the present invention provides an electrolyte solution for a lithium-ion battery that can be used in a high-voltage environment

Method used

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  • High-voltage electrolyte for lithium ion battery and preparation method of high-voltage electrolyte
  • High-voltage electrolyte for lithium ion battery and preparation method of high-voltage electrolyte
  • High-voltage electrolyte for lithium ion battery and preparation method of high-voltage electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In a glove box with a nitrogen-filled humidity of less than 0.1ppm, weigh DMC and EMC with a mass ratio of 3:5, then add PC with a volume ratio of DMC-EMC:PC=100:4 to form a ternary organic solvent; Then add LiPF 6 To make its concentration 1mol / L; add the second additive FEC at the ratio of volume ratio DMC-EMC:FEC=100:2, add the first additive TTD at the ratio of mass ratio DMC-EMC:TTD=100:0.5. That is, the high-voltage electrolyte solution of the present invention is obtained.

Embodiment 2

[0050] The high-voltage electrolyte of Example 2 was prepared in a similar manner to Example 1, except that the first additive TTD was added in a mass ratio of DMC-EMC:TTD=100:1 on the basis of Example 1.

Embodiment 3

[0052] The high-voltage electrolyte of Example 2 was prepared in a similar manner to Example 1, except that the first additive TTD was added in a mass ratio of DMC-EMC:TTD=100:2 on the basis of Example 1.

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Abstract

The invention relates to a high-voltage electrolyte for a lithium ion battery and a preparation method of the high-voltage electrolyte, and belongs to the technical field of lithium ion batteries. The high-voltage electrolyte is composed of a ternary organic solvent, an electrolyte and an additive, and the additive comprises thiophene-2, 5-diyl dimethyl phosphonic acid tetramethyl ester (TTD). The high-temperature electrolyte is relatively low in cost of required raw materials, simple to prepare and excellent in high-pressure performance, and when the high-temperature electrolyte is applied to the lithium ion battery taking a high-nickel material (NCM811) as a positive electrode, the electrochemical performance, especially the cycle rate performance, of the battery is obviously improved.

Description

【Technical field】 [0001] The invention belongs to the field of lithium-ion batteries, in particular, the invention relates to a high-voltage electrolyte for lithium-ion batteries and a preparation method thereof. The present invention also relates to the synthesis of the high-voltage electrolyte additive TTD, and a lithium ion battery containing the high-voltage electrolyte. 【Background technique】 [0002] Because of its high capacity, high energy, small size, light weight, and environmental friendliness, lithium-ion batteries have been widely used in portable mobile electronic products such as mobile phones, notebook computers, and digital cameras since their commercialization. In this context, there is no doubt that higher requirements are put forward for the technology of lithium-ion batteries. Therefore, how to improve the energy density of power batteries, extend the cruising range, and reduce the cost of batteries under the premise of ensuring safety is an urgent probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02P70/50
Inventor 陈军吕伟霞曹米红
Owner JIANGXI UNIV OF SCI & TECH
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