Carbon Interlayer Electrode for High-Temperature Adhesion
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Solution Overview
Problem
Existing all-solid-state batteries experience a decrease in adhesiveness between the current collector and active material layer at high temperatures, leading to potential durability issues.
Innovation Solution
Incorporating a carbon material layer with a dispersion material and binder between the current collector and active material layer, enhancing adhesiveness and maintaining ion conduction paths even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a carbon material layer with adhesive property is provided between current collector and active material layer, then adhesiveness is improved, but at high temperatures the adhesive property decreases leading to reduced adhesiveness
Solution Approach 1:
The patent changes the chemical composition parameters of the carbon material layer by incorporating specific dispersants (5-50 wt% relative to carbon material) and conductive additives (1-50 wt% relative to carbon material). This compositional modification allows the layer to maintain adhesive properties at high temperatures while preserving electrical conductivity, resolving the contradiction between adhesiveness and temperature stability.
Solution Approach 2:
The patent creates a composite carbon material layer combining carbon material with dispersants and conductive additives. This composite structure provides both adhesive functionality and high-temperature stability, as the dispersant phase prevents aggregation and maintains structural integrity at elevated temperatures while the conductive additive ensures electrical pathways remain functional.
2Strength
If carbon material layer is added to improve adhesiveness, then bonding between layers is enhanced, but electrical conductivity may be compromised
Solution Approach 1:
The patent designs the carbon material layer to perform multiple functions simultaneously: the carbon material provides both adhesive bonding and electrical conductivity, the dispersant enhances adhesion and prevents aggregation, and the conductive additive ensures electrical pathways. This multi-functional composite layer resolves the contradiction between adhesiveness and electrical conductivity.
Solution Approach 2:
The dispersant acts as an intermediary between the carbon material particles and the electrode layers, improving interfacial adhesion while the conductive additive serves as an intermediary to maintain electrical pathways through the carbon material layer. These intermediary substances enable the layer to achieve both adhesive and conductive functions.
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 provides an electrode with satisfactory adhesiveness and durability at high temperatures, suppressing resistance increases and ensuring the integrity of the battery performance.
Implementation Method 1
when the all-solid-state battery reaches a high temperature (for example, 80°C), the adhesive property of the carbon material layer may decrease
Implementation Method 2
maintaining ion conduction paths even at high temperatures
Data Source
Figure 1~3
Figure 4A~4E
Figure 5
AI summary
An electrode (10) for an all-solid-state battery (100) includes a current collector (1), a carbon material layer (3) having an adhesive property, and an active material layer (2) in this order in the thickness direction, and the carbon material layer (3) contains a carbon material, a dispersion material, and a binder.