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Thiophene ester compound electrolyte additive and high-voltage electrolyte containing same

An electrolyte additive and compound technology, which is applied in the field of thiophene ester compound electrolyte additives and high-voltage electrolytes, can solve the problems of poor cycle performance, easy decomposition, low charging and discharging efficiency of lithium ion batteries, etc., and achieves inhibition of oxidative decomposition, Improve cycle performance and reduce catalytic effect

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ester electrolyte of conventional lithium-ion batteries is easy to decompose under high voltage, resulting in low charge and discharge efficiency and poor cycle performance of lithium-ion batteries, which restricts the further development of high-voltage lithium-ion batteries.

Method used

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  • Thiophene ester compound electrolyte additive and high-voltage electrolyte containing same
  • Thiophene ester compound electrolyte additive and high-voltage electrolyte containing same
  • Thiophene ester compound electrolyte additive and high-voltage electrolyte containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a glove box filled with argon (moisture 6 , with a final concentration of 1.0mol / L to obtain a conventional electrolyte; then add a new type of substituted thiophene additive to the prepared conventional electrolyte in an amount of 5%; obtain a high-voltage electrolyte for lithium secondary batteries. The structural formula of the electrolyte additive is as follows:

[0027]

[0028] Preparation of lithium-ion batteries: LiNiMnO is selected as the positive electrode active material 4 , the negative electrode material is artificial graphite, Celgard2400 diaphragm is used, and the above-mentioned prepared electrolyte is injected to assemble a lithium-ion battery.

Embodiment 2

[0030] In a glove box filled with argon (moisture 6 , with a final concentration of 0.8mol / L to obtain a conventional electrolyte; then add a new type of substituted thiophene additive to the prepared conventional electrolyte in an amount of 3.5%; obtain a high-voltage electrolyte for lithium secondary batteries. The structural formula of the electrolyte additive is as follows:

[0031]

[0032] Preparation of lithium-ion batteries: LiNiMnO is selected as the positive electrode active material 4 , the negative electrode material is artificial graphite, Celgard2400 diaphragm is used, and the above-mentioned prepared electrolyte is injected to assemble a lithium-ion battery.

Embodiment 3

[0034] In a glove box filled with argon (moisture 6 , with a final concentration of 1mol / L to obtain a conventional electrolyte; then add a new type of substituted thiophene additive to the prepared conventional electrolyte in an amount of 8%; obtain a high-voltage electrolyte for lithium secondary batteries. The structural formula of the electrolyte additive is as follows:

[0035]

[0036] Preparation of lithium-ion batteries: LiNiMnO is selected as the positive electrode active material 4 , the negative electrode material is artificial graphite, Celgard2400 diaphragm is used, and the above-mentioned prepared electrolyte is injected to assemble a lithium-ion battery.

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Abstract

The invention relates to a thiophene ester compound electrolyte additive and a high-voltage electrolyte containing the same, and belongs to the field of lithium-ion batteries. A thiophene ester compound is applied to an electrolyte for the lithium battery to obtain the high-voltage electrolyte; the high-voltage electrolyte comprises a lithium salt, an organic solvent and the thiophene ester compound; and the mass of the thiophene ester compound is 0.1%-10% that of the electrolyte for the lithium battery. The thiophene ester compound provided by the invention is beneficial to forming of a stable and compact interfacial film on the surfaces of a cathode and a graphite anode and suppressing of oxygenolysis of the electrolyte, so that the safety performance of the lithium-ion battery and the cycle performance at a high voltage are improved.

Description

technical field [0001] The invention relates to a thiophene ester compound electrolyte additive and a high-voltage electrolyte containing the electrolyte additive, belonging to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have a series of advantages such as high working voltage, high energy and power density, long cycle life, small self-discharge, and environmental friendliness. They have become the most efficient energy storage devices and are widely used in mobile electronic devices. And it will be more widely developed in electric vehicles and hybrid vehicles. With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium batteries. In addition to the improvement of existing materials and battery manufacturing processes, high-voltage cathode materials are one of the more popular research directions. It achieves high energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567H01M2300/0025Y02E60/10
Inventor 李劼洪波赵星星张娟张治安赖延清张凯
Owner CENT SOUTH UNIV
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