Conductive Electrode Paste for Low-Resistance Solid-State Batteries
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Solution Overview
Problem
Existing all-solid-state secondary batteries face challenges in reducing internal resistance and improving high-temperature cycle characteristics, limiting their application in various devices.
Innovation Solution
A conductive material paste for all-solid-state secondary battery electrodes, comprising a specific polymer and organic solvent, is used to create a slurry composition that enhances dispersibility and electrical contact, resulting in reduced internal resistance and improved high-temperature cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slurry composition is used for all-solid-state secondary battery electrode, then manufacturing process is simple, but internal resistance is high and high-temperature cycle characteristics are poor
Solution Approach 1:
The conductive material paste is prepared in advance by compounding conductive material, binder, and organic solvent in specific proportions before being added to the slurry composition. This preliminary preparation ensures optimal dispersion and distribution of conductive material in the electrode, reducing internal resistance and improving high-temperature cycle characteristics without significantly complicating the overall manufacturing process.
Solution Approach 2:
The invention specifies particular parameters for the organic solvent (solubility parameter 6.4-10.0 (cal/cm³)¹/², boiling point 60-120°C) and binder (specific proportions of (meth)acrylic acid ester monomer units) to optimize the conductive material paste formulation. These parameter changes ensure proper viscosity, dispersion, and electrochemical stability, leading to reduced internal resistance and improved cycle performance at high temperatures.
2Reliability
If conductive material paste with specific binder and organic solvent is used, then internal resistance is reduced and high-temperature cycle characteristics are improved, but paste formulation becomes more complex
Solution Approach 1:
The invention defines specific parameter ranges for the organic solvent (solubility parameter 6.4-10.0 (cal/cm³)¹/², boiling point 60-120°C) and binder composition ((meth)acrylic acid ester monomer units in 25-95 mass%) to optimize paste performance. These controlled parameter changes achieve the desired balance between reducing internal resistance and maintaining manageable formulation complexity.
Solution Approach 2:
The conductive material paste is formulated as a composite system combining conductive material, specifically designed binder polymer, and organic solvent in optimized proportions. This composite approach ensures synergistic effects where each component contributes to overall performance: conductive material provides electrical pathways, binder ensures adhesion and structural integrity, and organic solvent enables proper dispersion and processing.
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 conductive material paste achieves significantly reduced internal resistance and excellent high-temperature cycle characteristics in all-solid-state secondary batteries, enhancing their performance and versatility.
Implementation Method 1
an organic solvent having a solubility parameter (SP value) of not less than 6.4 (cal/cm3)1/2 and not more than 10.0 (cal/cm3)1/2
Data Source
AI summary
Provided is a conductive material paste for an all-solid-state secondary battery electrode that can bring about sufficiently reduced internal resistance and excellent high-temperature cycle characteristics in an all-solid-state secondary battery. The conductive material paste for an all-solid-state secondary battery electrode contains a conductive material, a polymer including a (meth)acrylic acid ester monomer unit in a proportion of not less than 25 mass % and not more than 95 mass %, and an organic solvent having a solubility parameter (SP value) of not less than 6.4 (cal/cm3)1/2 and not more than 10.0 (cal/cm3)1/2.