Composite Cathode Structure With Conductive Skeleton for High-Rate Cycling
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Solution Overview
Problem
Lithium-ion battery cathode materials face issues of poor conductivity, low compaction density, severe capacity attenuation under high current, and high production costs, which affect the electrochemical performance and industrial scalability.
Innovation Solution
A composite cathode material with a conductive core, conductive skeleton, and cathode material coating layer is developed, where the conductive skeleton extends into the coating layer, forming a conductive network structure that enhances conductivity, electrolyte penetration, and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cathode materials are used, then production cost is reduced, but conductivity is poor
Solution Approach 1:
The patent employs composite materials by combining conductive cores (carbon materials) with cathode active materials (lithium manganese iron phosphate), creating a core-shell structure that integrates the high conductivity of carbon materials with the electrochemical activity of the cathode material, thereby resolving the contradiction between conductivity and production cost
Solution Approach 2:
The conductive skeleton is strategically positioned within the cathode material coating layer, creating localized conductive networks at critical interfaces and within the coating matrix, which enhances overall conductivity without requiring uniform distribution of expensive conductive additives throughout the entire structure
2Quantity of substance
If conventional cathode materials are used, then production cost is reduced, but compaction density is low
Solution Approach 1:
The composite structure combines dense cathode material coating with a conductive skeleton framework, achieving high compaction density through the packed arrangement of coating particles while the skeleton provides structural support, allowing efficient space utilization without excessive cost
3Reliability
If conventional cathode materials are used, then structure is simple, but capacity attenuation is severe under high current
Solution Approach 1:
The conductive skeleton is locally distributed within the cathode material coating layer, creating conductive pathways at critical locations where electron transport is needed, rather than requiring a complex throughout structure, thus improving capacity retention with moderate structural complexity
Solution Approach 2:
The conductive skeleton acts as an intermediary component between the conductive core and the cathode material coating, facilitating electron transport across the interface and within the coating, which improves capacity retention under high current without requiring direct contact between all components
4Speed
If conventional cathode materials are used, then structure is simple, but rate performance is poor
Solution Approach 1:
The conductive skeleton serves as an intermediary that accelerates electron transport within the cathode material coating and at the core-coating interface, enabling faster charge transfer rates without requiring a fundamentally complex structure, thus improving rate performance with controlled structural complexity
Solution Approach 2:
The composite of conductive core, conductive skeleton, and cathode material coating creates a multi-phase structure with optimized charge transport pathways, where each component contributes specific properties that collectively enhance rate performance beyond what a single material could achieve
Data Source
AI summary
A composite cathode material, a preparation method thereof, and an application thereof are provided. The composite cathode material of the present application includes: a conductive core, and a cathode material coating layer covering the conductive core. The composite cathode material further includes a conductive skeleton. One end of the conductive skeleton is in contact with the conductive core, and an other end of the conductive skeleton at least extends into the cathode material coating layer. The composite cathode material of the present application has high conductivity, structural stability, and compaction density, and has high cycle performance and electrochemical performance. The preparation method of the composite cathode material can ensure that the structure and electrochemical performance of the prepared composite cathode material are stable, and the efficiency is high, thus saving production costs.