Imidazole Conductive Paste for Electrode Slurry Viscosity Control
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Solution Overview
Problem
Conventional slurry compositions for electrochemical devices face challenges in achieving high solid content concentrations, which limits their electrical characteristics, particularly low-temperature output and cycle performance, and the addition of benzimidazole-based anti-aging agents has not sufficiently addressed these issues.
Innovation Solution
A conductive material paste comprising an imidazole compound with a specific structure, a binder, and an organic solvent, where the imidazole compound is represented by formula (I), is used to increase the solid content concentration and enhance low-temperature output and cycle characteristics of electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the solid content concentration of a slurry composition for an electrode is increased to improve electrical characteristics, then low-temperature output characteristics and cycle characteristics are enhanced, but the viscosity of the slurry composition increases excessively, making it difficult to ensure coatability during electrode production
Solution Approach 1:
The patent introduces an imidazole compound as an intermediary substance that mediates between the solid content concentration and viscosity of the slurry composition. This compound acts as a dispersant and viscosity modifier, allowing high solid content concentration to be achieved without excessive viscosity increase, thereby maintaining both improved electrical characteristics and manufacturability
Solution Approach 2:
The patent changes the chemical composition parameters of the slurry by incorporating specific imidazole compounds with particular molecular structures and properties. This parameter change enables the slurry to achieve high solid content concentration while maintaining appropriate viscosity levels for coating processes, resolving the contradiction between performance improvement and manufacturing ease
2Duration of action of stationary object
If a benzimidazole-based anti-aging agent is compounded in a slurry composition for an electrode, then internal degradation is reduced and service life is extended, but the solid content concentration of the slurry composition cannot be sufficiently increased, limiting electrical characteristics improvement
Solution Approach 1:
The patent merges the functions of the anti-aging agent and the dispersant/viscosity modifier by using an imidazole compound that combines both anti-aging properties and the ability to maintain low viscosity at high solid content concentrations. This merging allows the slurry to achieve both extended service life and high solid content concentration for improved electrical characteristics
Solution Approach 2:
The imidazole compound serves multiple functions simultaneously: it acts as an anti-aging agent to extend service life, as a dispersant to maintain uniform distribution of solid content, and as a viscosity modifier to enable high solid content concentration without excessive thickening. This multi-functionality resolves the contradiction between service life extension and electrical characteristics improvement
Data Source
AI summary
A conductive material paste for an electrochemical device contains a conductive material, an imidazole compound represented by the following formula (I), a binder, and an organic solvent. In formula (I), X1 and X2 are each hydrogen or a monovalent organic group that optionally forms a ring structure, and X3 and X4 are each hydrogen or an independent monovalent organic group.