Composite-Coated Anode Material for Uniform Battery Dispersion
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Solution Overview
Problem
Lithium secondary batteries face challenges in anode production due to the hydrophobic nature of carbon-based materials, leading to low miscibility with hydrophilic solvents, non-uniform dispersion, and initial irreversible reactions, which affect battery capacity and productivity.
Innovation Solution
A method involving a core-shell structure where a crystalline carbon-based material is coated with a composite layer of low crystalline or amorphous carbon and silicon oxide, enabling intercalation and deintercalation of ions, is developed. This involves mixing a precursor with silicon oxide, purifying it, and then applying it to the crystalline carbon-based core, followed by baking to create a uniform composite coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon-based material is used as anode active material, then high energy density and long cycle lifespan are achieved, but hydrophobicity causes low miscibility with hydrophilic solvent and non-uniform dispersion
Solution Approach 1:
The patent applies composite materials by coating carbon-based anode active material with a composite coating layer containing silicon oxide and carbon. This composite structure combines the high energy density and long cycle lifespan of carbon-based materials with the hydrophilic properties of silicon oxide, achieving both improved dispersion uniformity and maintained battery performance.
2Reliability
If carbon-based material is used as anode active material, then high energy density is achieved, but hydrophobicity causes low miscibility with hydrophilic solvent, complicating electrolyte impregnation
Solution Approach 1:
The patent uses silicon oxide as an intermediary substance in the composite coating layer. This intermediary provides hydrophilic properties that facilitate electrolyte impregnation while the carbon component maintains high energy density. The intermediary layer acts as a bridge between the hydrophobic carbon-based material and the hydrophilic electrolyte.
3Stability of the object's composition
If surfactant is added to anode or electrolyte, then miscibility and dispersion uniformity are improved, but side effects on driving properties occur
Solution Approach 1:
The patent extracts and eliminates the need for surfactants by incorporating hydrophilic silicon oxide directly into the anode active material structure. This intrinsic modification provides improved miscibility and dispersion uniformity without introducing external surfactants that would cause side effects on driving properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves the uniformity of the anode active material, reduces impregnation time of electrolytes, and enhances battery capacity and productivity by minimizing the formation of a solid electrolyte interface layer, thus addressing the issues of hydrophobicity and initial irreversible reactions.
Implementation Method 1
baking the core-shell precursor to carbonize the raw material of the one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon into the one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon
Implementation Method 2
silicon oxide enabling intercalation and deintercalation of ions
Data Source
AI summary
Disclosed is a method for preparing an anode active material comprising a core composed of a crystalline carbon-based material, and a composite coating layer composed of one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon, and silicon oxide enabling intercalation and deintercalation of ions, the method comprising (a) mixing a precursor for a raw material of the one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon with silicon oxide enabling intercalation and deintercalation of ions, followed by purification, to prepare a mixture for coating, (b) mixing the mixture for coating with a crystalline carbon-based material to prepare a core-shell precursor comprising the raw material mixture for coating applied to the core composed of the crystalline carbon-based material, and (c) baking the core-shell precursor to carbonize the raw material of the one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon into the one or more materials selected from the group consisting of low crystalline carbon and amorphous carbon.