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Application of 2, 2-difluoroethyl acetate in battery electrolyte

A difluoroethyl ester and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of battery capacity loss, increased manufacturing cost, and reduced battery performance, and achieve gas expansion Low, increased storage performance, long cycle life effect

Pending Publication Date: 2021-12-17
SHIJIAZHUANG SAN TAI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent structure of these positive electrode materials changes under high voltage, and the transition metal is easy to dissolve and deposit on the negative electrode. In addition, the commonly used electrolyte usually decomposes at a voltage higher than 4V, producing gas, thereby will lead to a decrease in battery performance
In order to solve the above problems, researchers usually carry out surface protection coating or doping on the positive electrode material to improve the cycle performance under high voltage, but these methods are often accompanied by the loss of battery capacity, and the manufacturing process is cumbersome and the manufacturing cost increases.

Method used

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  • Application of 2, 2-difluoroethyl acetate in battery electrolyte
  • Application of 2, 2-difluoroethyl acetate in battery electrolyte
  • Application of 2, 2-difluoroethyl acetate in battery electrolyte

Examples

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Effect test

Embodiment 1

[0017] The battery electrolyte includes LiPF at a mass ratio of 15:84.9:0.1 6 , butyl trifluoroacetate and 2,2-difluoroethyl acetate (a purity of more than 99.5%), the water content in the battery electrolyte is 26ppm, and the acid value is 39ppm.

Embodiment 2

[0019] Take propylene carbonate, methyl propionate and methyl trifluoroacetate with a volume ratio of 30:40:30 and mix them to obtain an organic solvent;

[0020] Take LiBF with a weight ratio of 1:2 4 and LiSO 3 CF 3 together as a lithium salt;

[0021] The battery electrolyte includes lithium salt with a mass ratio of 17:82:1, an organic solvent and 2,2-difluoroethyl acetate (a purity of more than 99.5%). The water content in the obtained battery electrolyte is 31ppm, and the acid value is 39ppm.

Embodiment 3

[0023] Mix ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and ethyl trifluoroacetate with a volume ratio of 10:20:30:10:30 to obtain an organic solvent;

[0024] Take LiClO with a weight ratio of 1:2:1 4 , LiN(CF 3 SO 2 ) 2 and LiC(CF 3 SO 2 ) 3 together as a lithium salt;

[0025] The battery electrolyte includes lithium salt with a mass ratio of 15.6:83:1.4, an organic solvent and 2,2-difluoroethyl acetate (a purity of more than 99.5%). The water content in the obtained battery electrolyte is 28ppm, and the acid value is 38ppm.

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Abstract

The invention discloses an application of 2, 2-difluoroethyl acetate in a battery electrolyte, which relates to the technical field of battery electrolyte additives. The 2, 2-difluoroethyl acetate is added into the battery electrolyte as an additive, and the use amount of the 2, 2-difluoroethyl acetate is 0.1-10% of the mass of the battery electrolyte. The prepared battery electrolyte added with 2, 2-difluoroethyl acetate is high in charging and discharging efficiency and good in cycle performance, and the capacity retention rate can reach 73.5% or above under the condition of 50 DEG C after 600 times of charging and discharging cycles at 1C; particularly, the low-temperature (-40 DEG C) discharge efficiency of 80.02% or above can be ensured while the high-temperature cycle performance of the lithium battery is improved, the storage performance of the battery can be improved, and other performances of the lithium battery are not influenced.

Description

technical field [0001] The invention relates to the technical field of battery electrolyte additives, in particular to the application of 2,2-difluoroethyl acetate in battery electrolyte. Background technique [0002] Recently, there has been increasing interest in energy storage technologies. As energy storage technology extends to devices such as cellular phones, camcorders, notebook computers, personal computers, and electric vehicles, the demand for high energy density batteries used as energy sources for such electronic devices is also increasing. Lithium ion secondary batteries are one of the most satisfactory batteries, and various studies for their improvement are currently being actively conducted. [0003] Among the currently used secondary batteries, the lithium secondary battery developed in the early 1990s includes an anode made of a carbon material capable of intercalating or extracting lithium ions, a cathode made of a lithium-containing oxide, and a A non-a...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525Y02E60/10
Inventor 武利斌闫彩桥许晓丹闫朋飞杨世雄赵光华高山林胜赛李庆占邢艳召刘鹏田丽霞张茜张民彭鹏鹏郝俊侯荣雪王军葛建民张利辉何蕊
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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