Electrode Slurry Composition for CNT Dispersion in Solid-State Batteries
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Solution Overview
Problem
The electrode slurry used for all solid state batteries faces challenges in achieving sufficient dispersion of fiber-shaped conductive materials like carbon nanotubes due to their tendency to form bundle structures, especially when dispersed in low-polarity dispersion media.
Innovation Solution
The electrode slurry comprises an electrode active material with a hydroxyl group, a fiber-shaped conductive material with an acidic functional group, a solid electrolyte, and a low-polarity dispersion medium. This combination enhances the dispersibility of the fiber-shaped conductive material by interacting through hydroxyl and acidic functional groups, inhibiting aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a low-polarity dispersion medium is used to inhibit solid electrolyte decomposition, then the stability of the solid electrolyte is improved, but the dispersibility of fiber-shaped conductive material deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the dispersion medium by introducing a specific compound containing both basic and acidic functional groups. This dual-functional compound adjusts the interaction balance between fiber-shaped conductive materials and the low-polarity dispersion medium, enabling sufficient dispersion while maintaining solid electrolyte stability.
Solution Approach 2:
The compound containing basic and acidic functional groups acts as an intermediary substance that mediates between the fiber-shaped conductive material and the low-polarity dispersion medium. The basic functional group interacts with acidic groups on the conductive material surface, while the acidic functional group interacts with the dispersion medium, achieving stable dispersion without compromising electrolyte stability.
2Reliability
If fiber-shaped conductive material is dispersed in low-polarity dispersion medium, then the stability of the battery system is improved, but the uniformity of conductive material distribution deteriorates
Solution Approach 1:
The invention modifies the chemical interaction parameters by using a compound with dual functional groups that can simultaneously interact with both the conductive material and the low-polarity dispersion medium, achieving uniform distribution while maintaining system stability.
Solution Approach 2:
The invention uses a composite dispersion medium containing a compound with both basic and acidic functional groups, creating a multi-functional dispersion system that addresses both stability and uniformity requirements simultaneously.
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 proposed solution achieves excellent dispersibility of fiber-shaped conductive materials, leading to improved electrode layer formation and enhanced performance of all solid state batteries, including reduced cell resistance and higher electron conductivity.
Implementation Method 1
an electrode active material including a hydroxyl group, a fiber shaped conductive material including an acidic functional group
Implementation Method 2
a fiber shaped conductive material including an acidic functional group
Data Source
AI summary
A main object of the present disclosure is to provide an electrode slurry of which dispersibility of a fiber shaped conductive material is well. The present disclosure achieves the object by providing an electrode slurry used for an all solid state battery, the electrode slurry containing an electrode active material including a hydroxyl group, a fiber shaped conductive material including an acidic functional group, a solid electrolyte, and a dispersion medium.