Gradient Nanocomposite Electrode Particles for Swelling-Stable Batteries
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Solution Overview
Problem
Conventional battery electrodes face challenges such as volume changes and low conductivity during operation, leading to cell degradation, particularly in high-capacity materials like metal-ion batteries, which result in reduced energy density and power performance.
Innovation Solution
A composite particle design featuring a high-capacity active material within a porous, electrically-conductive scaffolding matrix where material properties such as composition, pore size, and defect concentration gradient from the center to the perimeter, along with a protective shell, enhance mechanical stability and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-capacity active materials are used to increase energy density, then volumetric capacity is improved, but volume changes during operation occur leading to cell degradation
Solution Approach 1:
The patent embeds high-capacity active material particles within a porous scaffolding matrix structure, creating a nested configuration where the active material is contained within the matrix framework. This nesting approach allows the matrix to constrain and accommodate volume changes of the active material during ion insertion/extraction, preventing degradation while maintaining high volumetric capacity
Solution Approach 2:
The porous scaffolding matrix acts as a flexible structural framework that can dynamically adjust and accommodate volume changes of the embedded active material during battery cycling. The matrix structure provides mechanical flexibility to handle expansion and contraction without causing particle degradation or loss of electrical connectivity
2Quantity of substance
If high-capacity active materials are used to increase energy density, then ion storage ability is improved, but conductivity decreases leading to low power performance
Solution Approach 1:
The patent creates a composite structure combining high-capacity active material with a conductive porous scaffolding matrix. This composite design ensures that the active material particles remain electrically connected through the conductive matrix network, maintaining high power performance while utilizing high-capacity materials for ion storage
Solution Approach 2:
The porous scaffolding matrix provides locally optimized electrical conductivity throughout the electrode structure, ensuring that each region maintains adequate conductivity regardless of the intrinsic conductivity limitations of the high-capacity active material. The matrix creates continuous conductive pathways that compensate for poor conductivity of the active material
3Quantity of substance
If active material concentration is increased to improve energy density, then capacity is improved, but mechanical stability decreases due to volume changes
Solution Approach 1:
The nested configuration of active material particles within the porous scaffolding matrix allows high active material concentration while maintaining mechanical stability. The matrix framework provides structural support that constrains volume changes, preventing particle aggregation and maintaining electrode integrity even at high capacity loadings
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
A battery electrode composition comprising composite particles, each composite particle comprises a high-capacity active material provided to store and release ions during battery operation, wherein the active material exhibits (i) a specific capacity of at least 220 mAh/g as a cathode active material or (ii) a specific capacity of at least 400 mAh/g as an anode active material; and a porous, electrically-conductive scaffolding matrix material within the pores of which the active material is disposed, wherein each composite particle exhibits at least one material property that changes from the center to the perimeter of the scaffolding matrix material.