Multilayer LMFP Electrode Sheet With Angled Fibers for Low Resistance
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Solution Overview
Problem
The existing multilayer composite electrode sheets for energy storage apparatuses have high internal resistance due to connecting interfaces between lithium manganese iron phosphate layers, which limits their energy density and electrochemical performance.
Innovation Solution
A multilayer composite electrode sheet is designed with first and second conductive fibers inserted at acute angles between lithium manganese iron phosphate layers, improving connection stability and reducing interface resistance by forming conductive pathways and enhancing structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple lithium manganese iron phosphate layers are stacked to increase energy density, then the energy density of the energy storage apparatus is improved, but the internal resistance increases due to connecting interfaces between layers
Solution Approach 1:
Conductive fibers are introduced as intermediary elements between adjacent lithium manganese iron phosphate layers. These fibers penetrate through the interfaces of multiple layers, establishing direct conductive pathways that bridge the electrical connection across layer boundaries, thereby reducing interface resistance while preserving the high energy density benefits of multilayer stacking
Solution Approach 2:
The electrode structure is designed as a composite system combining lithium manganese iron phosphate active material layers with conductive fiber networks. This composite architecture integrates the high capacity characteristics of the phosphate material with the excellent electrical conductivity of the fiber network, achieving both high energy density and low internal resistance
2Strength
If conductive fibers are inserted at acute angles between layers, then the connection stability and structural strength are improved, but the manufacturing complexity increases
Solution Approach 1:
Instead of inserting conductive fibers horizontally between layers, the invention transitions to a vertical/diagonal insertion approach where fibers penetrate through multiple layers in the thickness direction at acute angles. This dimensional change in insertion orientation simplifies the manufacturing process while achieving superior mechanical interlocking and electrical connection across the multilayer 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
The solution reduces internal resistance and enhances electrochemical performance, achieving higher energy density and structural strength in energy storage apparatuses.
Implementation Method 1
first conductive fibers, and second conductive fibers... forming conductive pathways
Data Source
AI summary
Disclosed are a multilayer composite electrode sheet, an energy storage apparatus and a preparation method. A positive current collector, a first lithium manganese iron phosphate layer, a second lithium manganese iron phosphate layer, a third lithium manganese iron phosphate layer are sequentially formed. One end of a first conductive fiber is inserted obliquely into the surface of the first lithium manganese iron phosphate layer on the one side and the other end is inserted obliquely into a surface of the second lithium manganese iron phosphate layer on one side. One end of a second conductive fiber is inserted obliquely into the surface of the second lithium manganese iron phosphate layer facing away from the positive current collector and the other end is inserted obliquely into a surface of the third lithium manganese iron phosphate layer facing toward the positive current collector.