Blended Cathode Material Coating for Conductive Battery Bonding
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Solution Overview
Problem
Existing lithium manganese iron phosphate and ternary materials exhibit insufficient bonding, leading to conductivity issues and increased manufacturing costs due to multi-step preparation processes.
Innovation Solution
Uniformly mix ternary and lithium manganese iron phosphate materials through high-energy ball milling, followed by applying a polyphosphazene intermediate as a coating to form an ultra-thin layer, blocking electrolyte contact and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium manganese iron phosphate and ternary materials are combined to form a composite, then energy density and comprehensive battery performance are improved, but bonding between materials is insufficient leading to conductivity issues
Solution Approach 1:
The patent uses lithium manganese iron phosphate as an intermediary material that serves dual purposes: it maintains the stable olivine structure to ensure reliability while also providing conductive pathways to improve overall battery performance. The material acts as a bridge between the stable but low-performance lithium iron phosphate and the high-performance but unstable ternary materials.
Solution Approach 2:
The patent creates a composite positive electrode material by combining lithium manganese iron phosphate with other materials in specific ratios. This composite structure allows the material to inherit the structural stability of lithium manganese iron phosphate while gaining the high energy density characteristics of ternary materials, resolving the contradiction between reliability and performance.
2Reliability
If multi-step preparation processes are used to improve material performance, then bonding and conductivity are enhanced, but manufacturing complexity and costs increase
Solution Approach 1:
The patent merges the preparation steps into a more integrated process where lithium manganese iron phosphate is synthesized and combined with other materials in a unified approach. This reduces the number of separate multi-step processes while maintaining the bonding and conductivity improvements through the inherent properties of the composite material structure.
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
Improves electrical conductivity and structural stability of the ternary blended positive electrode material by ensuring uniform mixing and preventing direct electrolyte contact, while simplifying the manufacturing process.
Implementation Method 1
Uniformly mix ternary and lithium manganese iron phosphate materials through high-energy ball milling
Implementation Method 2
applying a polyphosphazene intermediate as a coating to form an ultra-thin layer, blocking electrolyte contact and enhancing stability
Data Source
AI summary
A ternary blended positive electrode material and a preparation method thereof and a battery are provided. The preparation method includes mixing a ternary material, a lithium manganese iron phosphate material and a coating material, and performing high-energy ball milling on the obtained mixture to obtain the ternary blended positive electrode material. The coating material includes a polyphosphazene intermediate.