Silicon-Carbon Nanocomposite Anode With Embedded Silicon Platelets
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Solution Overview
Problem
Current silicon-based anode materials for lithium ion batteries face challenges in achieving high capacity and good cycle life retention, limiting their versatility across various devices.
Innovation Solution
A particulate silicon-carbon nanocomposite (SCN) material is developed, comprising a graphite particle core with an amorphous carbon layer and silicon nanostructures exhibiting plate-like morphologies, which are embedded and distributed conformally across the graphite surface, enhancing stability and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based anode materials are used to enhance capacity, then battery capacity is improved, but cycle life retention deteriorates
Solution Approach 1:
The patent applies composite materials by combining silicon nanostructures with graphite particle cores and amorphous carbon matrices. This composite structure leverages the high capacity of silicon while the graphite and carbon components provide structural stability and cycling performance, resolving the contradiction between capacity enhancement and cycle life retention
Solution Approach 2:
The patent segments silicon into nanostructures (nanoparticles, nanowires, or nanosheets) rather than using bulk silicon. This segmentation reduces the mechanical stress during lithium insertion/extraction cycles, preventing structural degradation and maintaining cycle life while preserving the high capacity benefit of silicon
2Quantity of substance
If silicon-based anode materials are used to achieve high capacity, then battery performance is improved, but adaptability across different devices deteriorates
Solution Approach 1:
The patent controls critical parameters including silicon nanostructure size (5-100 nm), composition ratios (silicon:graphite:carbon), and morphological characteristics. By optimizing these parameters, the anode material achieves consistent high capacity performance across different battery formats and applications, thereby improving adaptability and versatility
Data Source
AI summary
In an embodiment, a process for producing a particulate silicon-carbon nanocomposite (SCN) material includes: providing primary graphite particles carrying nanoscale silicon particles on outer surfaces thereof; performing a high shear mixing procedure to produce primary graphite particles carrying a multiplicity of silicon nanostructures exhibiting plate-like morphologies; distributing a source of amorphous carbon over the primary graphite particles carrying such silicon nanostructures; and producing by way of a carbonization procedure an amorphous carbon layer at least partially surrounding the outer surface of each primary graphite particle, within which such silicon nanostructures are embedded. In an embodiment, each SCN particle can have or be formed as: a graphite particle core; silicon nanostructures distributed across at least portions of the outer surface of the graphite particle core, including silicon nanostructures exhibiting plate-like morphologies; and an amorphous carbon layer encapsulating the silicon nanostructures and at least portions of the graphite particle core.