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Perfluoropolyether additives for lithium ion battery anodes

A lithium-ion battery, perfluoropolyether technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as harmful battery performance

Pending Publication Date: 2019-11-12
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can continuously and irreversibly consume electrolyte and lithium, and may further introduce new reaction products that are detrimental to battery performance

Method used

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Examples

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Embodiment Construction

[0015] As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

[0016] The stabilization of SEI layer growth on Li-Si anodes can be significantly improved by adding fluoroethylene carbonate (FEC) and vinylene carbonate (VC) to the electrolyte. These additives can preferentially decompose on the surface of the silicon particle surface, forming free radical species that can promote solvent polymerization. Solvent polymerization can improve the elasti...

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PUM

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Abstract

The disclosure provides perfluoropolyether additives for lithium ion battery anodes. A lithium ion battery includes a cathode, an anode including a silicon-based active material, a separator between the anode and the cathode, a liquid electrolyte, and an elastic and hydrophobic solid-electrolyte interphase layer between and in contact with the anode and electrolyte. Further, the electrolyte or a surface of the anode includes a perfluoropolyether compound.

Description

technical field [0001] The present disclosure relates to lithium ion battery cells, and more particularly to stabilizing active materials in lithium ion battery anodes. Background technique [0002] Li-ion battery anodes contain active materials that store lithium ions. The most commonly used active material is graphite, which has a specific capacity of 372mAh / g. The volumetric and gravimetric energy density of Li-ion batteries can be increased by adding silicon to the battery anode. Compared with graphite, silicon has a specific capacity of 4200mAh / g, and each silicon atom can bind more than 4 lithium ions. Given this increased specific capacity and the fact that silicon is cheap and naturally abundant, the integration of silicon into Li-ion battery anodes is an attractive alternative to graphite for next-generation Li-ion battery cells. [0003] In Li-ion batteries, through electrochemical and chemical reactions between lithium ions, electrolyte solvent, electrolyte sal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0088H01M4/133H01M4/134H01M4/364H01M4/386H01M4/483H01M4/587H01M10/0562H01M2300/0085Y02E60/10Y02P70/50H01M4/62H01M2004/027H01M2300/0025
Inventor 安德鲁·罗伯特·德雷斯凯文·吴季克
Owner FORD GLOBAL TECH LLC