Multilayer LMFP Electrode Sheet With Conductive Fiber Interfaces
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Solution Overview
Problem
Existing multilayer composite electrode sheets for energy storage apparatuses face high internal resistance due to connecting interfaces between lithium manganese iron phosphate layers, which affects their energy density and structural strength.
Innovation Solution
Incorporating first and second conductive fibers between lithium manganese iron phosphate layers at specific acute angles, forming connections that reduce interface resistance and enhance structural stability, thereby improving the electrochemical performance.
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 bypass the high-resistance connecting interfaces. The conductive fibers act as mediators that transfer electrical current efficiently across layer boundaries, thereby reducing the overall internal resistance while maintaining the multilayer structure for high energy density
Solution Approach 2:
The patent creates a composite structure by combining lithium manganese iron phosphate layers with conductive fiber materials. This composite architecture integrates the high capacity benefits of lithium manganese iron phosphate with the excellent electrical conductivity of the fiber material. The conductive fibers form a three-dimensional network within the multilayer composite, providing multiple parallel conduction paths that significantly reduce internal resistance while preserving the high energy density characteristics of the stacked layer structure
2Reliability
If conductive fibers are inserted at acute angles between layers, then the connection stability and conductive ability are improved, but the device complexity increases
Solution Approach 1:
The patent specifies optimal parameter ranges for the conductive fiber insertion, including acute angles between 0-45 degrees relative to the layer surface and fiber diameter between 1-10 micrometers. By defining these specific parameter ranges, the invention transforms a potentially complex manufacturing process into a controllable process with clear specification limits. The acute angle insertion geometry is maintained within these parameter bounds to ensure both connection stability and manufacturability
Solution Approach 2:
The conductive fibers are selectively inserted at acute angles specifically at the interfaces between lithium manganese iron phosphate layers, where the conductive need is most critical. This localized quality approach applies the acute angle insertion technique only where it provides maximum benefit for electrical connection, rather than uniformly throughout the entire electrode structure. The local application of this geometric configuration optimizes connection stability at the critical interfaces while minimizing overall device complexity
Data Source
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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.