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

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 ...

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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 charge capacity (capacity fade) and very limited cycle life are often observed during cycling of conventional silicon-containing electrodes.

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