Carbon Material Dispersant for All-Solid Batteries
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Solution Overview
Problem
Conventional dispersants like polyvinylpyrrolidone and polyvinylidene fluoride are insoluble in low-polar solvents, limiting their use in all-solid lithium ion secondary batteries, where a dispersant capable of improving dispersion uniformity and stability of carbon materials in low-polar solvents is needed for enhanced battery performance.
Innovation Solution
A dispersant containing a copolymer with a nitrogen content of 0.01 wt % to 5 wt % and an SP value of 8.0 to 12 (cal/cm3)1/2, which is soluble in low-polar solvents and media, is developed to improve the dispersion of carbon materials, specifically designed for use in the production of electrodes for all-solid lithium ion secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants like polyvinylpyrrolidone or polyvinylidene fluoride are used, then dispersion capability in high-polarity solvents is achieved, but solubility in low-polar solvents is lost
Solution Approach 1:
The dispersant's chemical structure is modified by incorporating fluorinated groups and adjusting the polymer composition to achieve solubility in low-polar solvents while maintaining dispersion capability. This changes the physical and chemical parameters of the dispersant to match the solvent environment.
Solution Approach 2:
The dispersant is designed as a composite polymer structure combining hydrophobic and hydrophilic segments, allowing it to interface effectively with both carbon materials and low-polar solvents. This composite structure enables simultaneous achievement of solubility and dispersion functionality.
2Adaptability or versatility
If carbon materials are dispersed in low-polar solvents without appropriate dispersants, then solvent compatibility is improved, but carbon material aggregation increases due to low affinity
Solution Approach 1:
The dispersant is designed as a functional additive that temporarily stabilizes the carbon material dispersion in low-polar solvents during battery manufacturing. It provides the necessary stability during processing without requiring long-term persistence.
Solution Approach 2:
The dispersant modifies the interfacial properties between carbon materials and low-polar solvents by changing surface energy parameters and affinity characteristics, enabling stable dispersion in low-polarity environments.
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 dispersant enhances the affinity of carbon materials for low-polar solvents, reducing aggregation and improving dispersion stability, resulting in better battery performance with excellent high-current charge/discharge characteristics, cycle characteristics, and electrode conductivity.
Implementation Method 1
the dispersant containing a copolymer... soluble in low-polar solvents and media, is developed to improve the dispersion of carbon materials
Data Source
AI summary
The present invention provides a dispersant for carbon materials, the dispersant containing a copolymer having a nitrogen-containing group, wherein the copolymer has a nitrogen content of 0.01 wt % or more and 5 wt % or less and the copolymer has an SP value of 8.0 to 12 (cal/cm3)1/2.