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A kind of high-voltage lithium-ion battery electrolyte additive

An electrolyte additive, lithium-ion battery technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of short cycle life, large initial capacity loss, explosion, etc.

Active Publication Date: 2021-01-01
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this material are also obvious, such as low battery reserve, large initial capacity loss, short cycle life, poor thermal stability, easy release of gas to make the battery expand, and the risk of explosion, etc.

Method used

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  • A kind of high-voltage lithium-ion battery electrolyte additive
  • A kind of high-voltage lithium-ion battery electrolyte additive
  • A kind of high-voltage lithium-ion battery electrolyte additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Positive electrode sheet preparation

[0033] Prepare the binder. Weigh 1g PVdF (polyvinylidene fluoride) and 9gnmp (n-methylpyrrolidone) and put it into a glass bottle, seal the lid with sealing glue and place it on a magnetic stirrer to stir for 12 hours until the The substance turned completely into a clear viscous mass.

[0034] Prepare slurry. First, weigh 1.000g of NCM811 powder and 0.0556g of superconducting graphite, transfer them to a grinding jar for grinding, wait until the grinding is uniform and become a fine powder, take out 0.95g and put it into a glass bottle, and add 0.5g of the above The prepared binder and 1.5gnmp were put into a magnet and stirred on a magnetic stirrer for 12 hours. During this process, the thickness should be constantly observed, and the amount of nmp should be adjusted constantly.

[0035] Apply pole piece. The pole pieces need to be coated on aluminum foil in a dehumidified environment. First, wipe the experimental platf...

Embodiment 2

[0055] In this embodiment, except that the composition and content of the electrolyte additive is 0.2 wt%, the others are the same as in the embodiment 1.

Embodiment 3

[0057] In this embodiment, except that the type of the lithium salt is lithium hexafluorophosphate, the others are the same as in the embodiment 1.

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Abstract

A high-voltage lithium ion battery electrolyte additive is prepared from dithiocarbonyl olefin compound as additive and features high cycling performance and high battery stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to an electrolyte, in particular to an electrolyte additive for a high-voltage lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices because of their excellent energy and power density. With the continuous discovery of new positive electrode active materials, the voltage range of lithium-ion batteries is on the line from the original 3V (vs, Li / LI + ) to the current 4.3V (vs, Li / LI + ), but it is also accompanied by many negative effects, such as cycle instability, faster specific capacity decay and other issues. [0003] Nowadays, the use of lithium-ion batteries as energy storage devices in electric vehicles and hybrid electric vehicles has become a hot spot of scientific research, which requires batteries with extremely high energy and power density, and requires excellent cycle stability and capacity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 陈仕谋高维群王世力张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI