Composite anode material including surface-stabilized active material particles and methods of making same
A technology of anode materials and active materials, applied in the field of electrochemical batteries, can solve the problems of reduced lithium ion insertion and removal, reduced capacity cycle life, increased capacity loss, etc.
Active Publication Date: 2020-05-01
SINODE SYST
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Problems solved by technology
Such structural degradation of silicon within the active material typically results in reduced intercalation and deintercalation of lithium ions within the active material, resulting in reduced capacity and / or cycle life
Additionally, mechanical degradation of silicon often results in electrical disconnection of silicon within the active material
This electrical disconnection of the silicon, caused by the mechanical degradation of the silicon particles, often results in a further reduction in cycle life and increased capacity loss
Method used
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[0018] In general, the present invention relates to structures of electrochemically active materials, including silicon and graphene, and methods of forming them. Active materials can be formed into electrodes that can be incorporated into electrochemical cells. More specifically, the present invention relates to structures and methods of forming electrochemically active materials comprising silicon and graphene that can be formed into electrodes for use with lithium ion electrochemical cells designed to provide increased capacity and capacity retention .
[0019] In various embodiments, the electrochemically active material of the present application comprises at least one electrochemically active component wrapped or encapsulated in graphene, partially reduced graphene oxide, or graphene oxide at least one of the constituent sacs or shells. In various embodiments, the active material particles include a core-shell structure. In various embodiments, the core-shell structur...
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Abstract
Composite anode materials and methods of making same, the anode materials including capsules including graphene, reduced graphene oxide, graphene oxide, or a combination thereof, and particles of an active material disposed inside of the capsules. The particles may each include a core and a buffer layer surrounding the core. The core may include crystalline silicon, and the buffer layer may include a silicon oxide, a lithium silicate, carbon, or a combination thereof.
Description
technical field [0001] The present invention relates to the field of electrochemical cells, and more particularly, to composite anode materials comprising surface-stabilized active material particles encapsulated in graphene or reduced graphene oxide and methods of making the same. Background technique [0002] Lithium (Li)-ion electrochemical cells typically have a relatively high energy density and are commonly used in a variety of applications including consumer electronics, wearable computing devices, military mobile devices, satellite communications, spacecraft devices, and electric vehicles . Lithium-ion batteries are particularly popular for use in large-scale energy applications such as low-emission electric vehicles, renewable energy power plants and stationary grids. In addition, lithium-ion batteries are at the forefront of a new generation of wireless and portable communication applications. One or more lithium-ion batteries can be used to configure the battery...
Claims
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IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M4/587H01M4/134H01M4/1395C01B33/02C01B33/32C01B32/182
CPCC01B33/113H01M4/134H01M4/366H01M4/483H01M4/485H01M4/587H01M4/133Y02E60/10Y02P20/133H01M4/62H01M4/386H01M4/625H01M4/1395C01B33/02C01B33/32C01B32/182H01M10/0525H01M4/622C01B32/198
Inventor J·麦金尼C·M·海纳J·J·劳S·贺F·王
Owner SINODE SYST