Interphase Electrode Structure for Balancing Energy and Power Density
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Solution Overview
Problem
Existing battery technologies face challenges in achieving a balance between energy density and power density, with traditional electrodes often compromising on one aspect at the expense of the other, and struggling to maintain mechanical integrity and ion conductivity during charging and discharging.
Innovation Solution
The development of multilayer electrodes with an interphase structure, comprising a current collector substrate and an active material composite with distinct layers and an interpenetrating interphase layer, which enhances mechanical stability, electronic percolation, and ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional single-layer electrode structures are used, then manufacturing simplicity is maintained, but energy density and power density cannot be balanced
Solution Approach 1:
The electrode is divided into multiple distinct layers (first layer with larger particles, second layer with smaller particles, and interphase layer), where each layer serves specific functions. This segmentation allows optimization of energy density in one layer while maintaining power density in another, resolving the contradiction between energy and power density without requiring overly complex structures.
Solution Approach 2:
Different regions of the electrode are given different properties: the first layer contains larger particles for high energy density, the second layer contains smaller particles for high power density and ion conductivity, and the interphase layer provides mechanical integrity. This local differentiation allows the electrode to simultaneously achieve balanced energy and power density.
2Quantity of substance
If electrode thickness is increased to improve energy density, then power density and ion conductivity deteriorate
Solution Approach 1:
The thick electrode is segmented into multiple layers with different particle sizes and functions. The second layer with smaller particles positioned in the thicker region maintains ion conductivity and power density, while the first layer with larger particles contributes to energy density, allowing the electrode to be thick without sacrificing power performance.
Solution Approach 2:
The electrode structure provides different local properties at different thickness regions. Areas with larger particle sizes optimize for energy density, while regions with smaller particle sizes maintain ion conductivity and power density even at increased thickness, resolving the trade-off between energy and power density.
3Strength
If mechanical integrity is prioritized in electrode design, then ion conductivity and power density are compromised
Solution Approach 1:
The interphase layer acts as an intermediary between the first and second layers, providing mechanical bonding and structural integrity while maintaining ion conductivity pathways. This intermediate layer resolves the contradiction by ensuring mechanical strength without compromising ion transport, thereby maintaining power density.
Solution Approach 2:
The electrode uses a composite structure combining different particle sizes and materials in distinct layers. The interphase layer, with its intermediate particle size and composition, creates a composite material system that simultaneously provides mechanical integrity and ion conductivity, overcoming the trade-off between strength and power density.
Data Source
AI summary
Methods are disclosed for manufacturing an electrode for use in a device such as a secondary battery. Electrodes may include a first layer having first active particles adhered together by a binder, a second layer having second active particles adhered together by a binder, and an interphase layer interposed between the first and second layers. In some examples, the interphase layer may include an interpenetration of the first and second particles, such that substantially discrete fingers of the first layer interlock with substantially discrete fingers of the second layer.