Solid-State Battery Electrode Composition for Conductive Thick Layers
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Solution Overview
Problem
Current solid-state batteries face challenges in achieving high electrically conductive properties and suitable thickness due to limitations in electrode materials and manufacturing processes, which affect their performance and suitability for mass production.
Innovation Solution
The electrode for solid-state batteries incorporates active material particles coupled with a resin containing polyimide, polyamide, or polyamideimide, which is carbonized in part to form an electrically conductive network, along with an inorganic solid-state electrolyte including lithium salts like Li2CO3, Li2SO4, or Li3BO3, to enhance conductivity and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid-state battery uses conventional electrode materials and manufacturing processes, then the battery structure is simple and manufacturing is easier, but the electrically conductive properties are insufficient and the battery cannot achieve high capacity and output
Solution Approach 1:
The electrode uses a composite structure consisting of active material particles, a carbonized resin binder (polyimide, polyamide, or polyamideimide), and inorganic solid-state electrolyte particles. This composite material system provides both high electrical conductivity through the carbonized resin network and mechanical integrity through the binder, resolving the contradiction between conductivity and structural complexity
Solution Approach 2:
The resin binder is carbonized by heating to a specific temperature range (500-800°C) to transform it from an insulating state to a conductive state. This parameter change (thermal treatment) enables the resin to form an electrically conductive network while maintaining its binding function, thus improving conductivity without excessive structural complexity
2Strength
If the electrode uses resin with high bonding property to strongly couple active material particles, then the electrode has high mechanical strength and prevents cracking, but the electrically conductive properties may be reduced due to insulation of the resin
Solution Approach 1:
The resin binder undergoes thermal carbonization at 500-800°C, which fundamentally changes its electrical properties from insulating to conductive while preserving its mechanical binding capabilities. This parameter change allows the same material to simultaneously provide both strength and conductivity
Solution Approach 2:
The carbonized resin forms localized conductive pathways and networks within the electrode structure, creating regions of high electrical conductivity where needed (at particle interfaces and within the binder matrix) while maintaining the overall mechanical integrity provided by the resin's binding function
3Productivity
If the solid-state battery electrode aims for high capacity and output, then the performance is superior, but the electrode thickness and material composition become more complex to achieve
Solution Approach 1:
The electrode employs a tri-component composite system (active material particles, carbonized resin binder, and inorganic solid-state electrolyte) that enables high capacity and output performance. The carbonized resin provides conductivity, the active material provides capacity, and the inorganic electrolyte ensures ion transport, achieving superior performance through synergistic material combination
Solution Approach 2:
The carbonized resin binder performs multiple functions simultaneously: it mechanically binds active material particles, provides electrical conductivity through carbonized networks, and maintains structural integrity during battery operation. This multi-functionality reduces the need for additional separate components, managing material complexity while achieving high performance
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
This configuration allows for a solid-state battery with improved electrically conductive properties, enabling higher capacity and output while maintaining flexibility and preventing electrode cracking, thus addressing the limitations of existing technologies.
Implementation Method 1
The resin includes at least one selected from the group consisting of polyimide, polyamide, and polyamideimide and includes a carbide in part
Data Source
AI summary
An electrode for a solid-state battery is provided and includes active material particles, a resin, and an inorganic solid-state electrolyte. The resin includes at least one selected from the group consisting of polyimide, polyamide, and polyamideimide and includes a carbide in part. The inorganic solid-state electrolyte includes a lithium salt that includes at least one element selected from the group consisting of boron (B), carbon (C), sulfur (S), and chlorine (Cl).