High performance silicon electrodes having improved interfacial adhesion among binder, silicon and conductive particles

A binder and negative electrode technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of reduced electrochemical cycle performance and cycle life

Inactive Publication Date: 2018-03-27
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, cracking of the negative electrode (e.g., anode), degradation of electrochemical cycling performance and large loss of Coulombic

Method used

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  • High performance silicon electrodes having improved interfacial adhesion among binder, silicon and conductive particles
  • High performance silicon electrodes having improved interfacial adhesion among binder, silicon and conductive particles
  • High performance silicon electrodes having improved interfacial adhesion among binder, silicon and conductive particles

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Embodiment 1

[0083] Amino-grafted carbon black particles were treated with HNO at 95 °C 3 (0.3M) oxidized carbon black for 6 hours to form a suspension to prepare carbon black ( ). The suspension was centrifuged and the carbon was washed by resuspension in water. Add 15 g of thionyl chloride (SOCl 2). While stirring, 1 g of oxidized carbon black was added. The flask opening was closed with a stopper, and the reaction mixture was initially heated slowly in an oil bath to a bath temperature of 50°C, then stirring was continued for 2 hours at a bath temperature of 80°C. The carbon black with -COCl was then centrifuged. Centrifuged carbon black with -COCl (5 g) was mixed with 5 g p-phenylenediamine and reacted overnight (about 6 to about 12 hours) at room temperature (about 18° C. to about 25° C.) to form ammonia grafted carbon black particles. Amino-grafted carbon black particles can be separated by centrifugation. Amino-grafted silicon (Si) particles were prepared from Si particles ...

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Abstract

Methods for making a negative electrode material for use in an electrochemical cell, like a lithium ion battery, are provided. The electroactive material includes a functionalized surface having a grafted reactive group (e.g., an amino group, a carboxyl group, an anhydride group, and the like). The electrically conductive material includes a functionalized surface having a grafted reactive group (e.g., an amino group, a carboxyl group, and the like). The functionalized electroactive material and the functionalized electrically conductive material is admixed and reacted with at least one binderprecursor having a reactive group (e.g., an amino group, an anhydride group, and the like). A porous solid electrode material is thus formed. Negative electrodes are also provided, which provide significant performance benefits and reduce the issues associated with capacity fade, diminished electrochemical cell performance, cracking, and short lifespan associated with conventional silicon anode materials.

Description

technical field [0001] The present invention relates to high performance silicon-containing electrodes for lithium-ion electrochemical devices, wherein the improved silicon-containing electrodes comprise silicon particles and conductive particles treated for improved and long-term interface of the binder Bonding to minimize capacity fade and enhance long-term performance, and methods of making and using such improved silicon-containing electrodes. Background technique [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] High-energy-density electrochemical cells, such as lithium-ion batteries, can be used in various consumer products and vehicles, such as hybrid electric vehicles (HEV) and electric vehicles (EV). A typical lithium-ion battery includes a first electrode (eg, a cathode), a second electrode of opposite polarity (eg, an anode), an electrolyte material, and a separator. Conventional ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/62H01M10/0525
CPCH01M4/134H01M4/1395H01M4/622H01M10/0525H01M2004/021H01M2004/027H01M4/133H01M4/1393H01M4/364H01M4/386H01M4/587H01M4/624H01M4/625H01M10/052Y02E60/10H01M4/60
Inventor 黄晓松
Owner GM GLOBAL TECH OPERATIONS LLC
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