Electrode Forming Liquid Composition for Low-Viscosity Piezo Discharge
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Solution Overview
Problem
Conventional liquid compositions for electrochemical devices have high viscosity, making them unsuitable for stable discharge using piezo-type liquid discharge heads, and there is a need to adjust viscosity and surface tension for improved discharge stability while minimizing environmental impact.
Innovation Solution
A liquid composition comprising an active material, electrolyte, and a polymer with amide or imide bonds, which reduces viscosity to 200 mPa·s or less, enhancing storage and discharge stability, and includes a polymer with specific functional groups for improved solubility and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid composition with binder dissolved in dispersion medium is used, then the composition can form electrode composite material layer, but the viscosity becomes thousands to tens of thousands of mPa·s which is too high for liquid discharge method
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional binders (PVDF, CMC, SBR) with a specifically designed polymer containing amide or imide bonds and hydrophobic groups. This chemical parameter change reduces viscosity from thousands to tens of thousands of mPa·s to 200 mPa·s or less, enabling liquid discharge method while maintaining electrode formation capability
Solution Approach 2:
The patent creates a composite liquid composition by combining active material particles, electrolyte, dispersion medium, and a specially designed polymer with both hydrophobic groups (for adhesion) and amide/imide bonds (for solubility). This composite approach achieves low viscosity while maintaining binding functionality
2Stability of the object's composition
If binder content is reduced to lower viscosity, then viscosity decreases, but the binding function of binder becomes insufficient
Solution Approach 1:
The patent introduces local quality differentiation in the polymer structure by incorporating both hydrophobic groups (for adhesion to active material and substrate) and amide/imide bond-containing segments (for solubility in dispersion medium). This localized functional differentiation allows the polymer to simultaneously provide binding strength and maintain low viscosity
Solution Approach 2:
The patent changes the molecular structure parameters of the binder by designing a polymer with specific functional groups (amide/imide bonds and hydrophobic groups) rather than using conventional binders. This structural parameter change enables the polymer to provide adequate binding function at lower concentrations, achieving viscosity of 200 mPa·s or less
3Measurement precision
If piezo-type liquid discharge head is used for accurate discharge control, then discharge amount can be precisely controlled without heat, but the liquid composition requires adjusted viscosity and surface tension for stable discharge
Solution Approach 1:
The patent adjusts the physical-chemical parameters of the liquid composition by selecting a polymer with amide/imide bonds and hydrophobic groups that provides optimal viscosity (200 mPa·s or less) and surface tension characteristics. This parameter optimization enables stable discharge from piezo-type heads with accurate discharge amount control
Solution Approach 2:
The specially designed polymer acts as an intermediary substance that mediates between the active material particles and the dispersion medium, creating a liquid composition with balanced viscosity and surface tension properties suitable for piezo-type liquid discharge method while maintaining storage stability
4Strength
If conventional binders like PVDF, CMC, or SBR are used, then binding function is provided, but environmental load increases and process optimization is limited
Solution Approach 1:
The patent replaces conventional binders (PVDF, CMC, SBR) with a newly designed polymer that can be synthesized from readily available monomers containing amide or imide bonds. This substitution reduces environmental load while maintaining binding function and enabling low-viscosity liquid composition for liquid discharge method
Solution Approach 2:
The patent creates an environmentally friendly composite liquid composition by designing a polymer with amide/imide bonds and hydrophobic groups that replaces conventional binders. This composite approach provides adequate binding strength while reducing environmental impact and enabling process optimization for liquid discharge manufacturing
Data Source
AI summary
The present invention relates to a liquid composition for forming an electrochemical device contains one or both of an active material or an electrolyte;a dispersion medium; and a polymer, wherein the polymer contains constituent units having one or both of an amide bond or an imide bond, and having a group represented by a following general formula (I):wherein X is an oxygen atom, or a carbon atom substituted with a hydrogen atom or an alkyl group, wherein R1, R2, R3, and R4 are each independently hydrogen atoms, substituted or unsubstituted alkyl groups, or substituted or unsubstituted cycloalkyl groups, and m and n are positive integers.