3D Mesh Solid-State Battery Electrode for Lower Internal Resistance
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Solution Overview
Problem
All solid type batteries face challenges with high internal resistance and reduced capacity due to large gaps between active material and solid electrolyte particles, which hinder electron and ionic conductivity.
Innovation Solution
A method involving the preparation of a nonwoven fabric precursor with polymer filaments, mixing with an electrode forming slurry, drying, pressing, and sintering to create a 3-dimensional mesh structure with fibrous carbon materials and inorganic solid electrolyte, enhancing contact and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode structure is used, then manufacturing is simple, but large gaps between particles increase internal resistance and reduce conductivity
Solution Approach 1:
The patent transitions from conventional granular electrode structures to a three-dimensional mesh structure formed by carbonized polymer filaments. This dimensional transformation creates a continuous conductive network that eliminates particle gaps while maintaining structural integrity, resolving the contradiction between reduced internal resistance and structural complexity.
Solution Approach 2:
The electrode employs a composite structure combining carbonized polymer filaments (providing electronic conductivity) with inorganic solid electrolyte particles and active material particles. This composite approach creates a dual-function network that simultaneously reduces internal resistance and maintains manufacturing feasibility through integrated material design.
2Reliability
If particle contact is improved by reducing gaps, then electron and ionic conductivity increase, but energy density decreases due to lower fill ratio
Solution Approach 1:
The patent applies different functional qualities to different regions of the electrode structure. The carbonized polymer filaments form a continuous three-dimensional mesh providing electronic conductivity pathways, while the spaces within this mesh are filled with inorganic solid electrolyte particles and active material particles. This local differentiation allows simultaneous optimization of conductivity and energy density without compromise.
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 resulting electrode exhibits improved electron and ionic conductivity, reducing internal resistance and increasing energy density by ensuring uniform dispersion and high fill ratio of components.
Implementation Method 1
a sintering step of thermally treating the pressed preliminary electrode to carbonize the polymer filaments
Implementation Method 2
the polymer filaments are prepared by spinning a polymer material by an electrospinning method
Data Source
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AI summary
An electrode for an all solid type battery according to the present disclosure is designed such that fibrous carbon materials serving as a conductor are densely arranged cross into a 3-dimensional structure in the form of a mesh of a nonwoven fabric-like shape, and an inorganic solid electrolyte and electrode active material particles are impregnated and uniformly dispersed in the structure. By this structural feature, the electrode for an all solid type battery according to the present disclosure has very good electron conductivity and ionic conductivity.