Polycarbonate Resin Composition for Low-Toxicity Coating Electrolytes
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Solution Overview
Problem
The challenge is to develop a resin composition that has low toxicity and can be easily applied as an ink or painting material while also forming a coating film and functioning as an electrolyte, particularly with improved solubility of polycarbonate resin in carbonate-based solvents.
Innovation Solution
A resin composition comprising a polycarbonate resin with specific constituent units and a carbonate-based organic solvent, where the polycarbonate resin is dissolved in the solvent to create a solution that can be used as a coating material and electrolyte, with lithium salts added for conductivity, and the solvent composition optimized for solubility and toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a common bisphenol A-type polycarbonate resin is used, then the resin has good mechanical properties and processability, but it cannot be dissolved in carbonate-based organic solvents with low toxicity
Solution Approach 1:
The patent modifies the chemical structure parameters of the polycarbonate resin by introducing specific side chains (formula 1) with adjustable parameters (R1-R14, a, X, R7-R8, b) to enhance solubility in carbonate-based solvents while maintaining low toxicity
Solution Approach 2:
The patent creates a composite resin structure combining polycarbonate backbone with specific side chain components (formulae 2-4) to achieve both solubility in eco-friendly solvents and desired mechanical properties
2Ease of manufacture
If methylene chloride is added as a solvent to improve solubility, then the resin can be coated as a colloidal solution, but it causes large environmental impact and safety concerns
Solution Approach 1:
The patent extracts and eliminates the harmful methylene chloride solvent from the system by designing a resin (formula 1) that achieves comparable coating performance using only carbonate-based organic solvents
Solution Approach 2:
The patent replaces expensive and harmful solvents with cheaper, environmentally friendly carbonate-based solvents that are already widely used in lithium ion batteries, reducing both environmental impact and cost
3Manufacturing precision
If the content of polycarbonate resin is increased to improve coating film quality, then the coating performance improves, but the solubility and ease of application deteriorates
Solution Approach 1:
The patent optimizes the molecular structure parameters of the polycarbonate resin (formula 1), particularly the side chain length and composition (R1-R14, a, X, R7-R8, b), to achieve a balance where high resin content (0.05-50% by mass) maintains good solubility and application properties
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 resin composition achieves low toxicity, improved solubility, and functionality as both a coating material and electrolyte, maintaining high conductivity even when the polycarbonate resin is dissolved, making it suitable for various applications including lithium-ion batteries.
Implementation Method 1
a polycarbonate resin having a specific constituent unit has excellent solubility in a carbonate-based organic solvent with low toxicity
Implementation Method 2
An electrolyte prepared by dissolving 0.1% to 30% by mass of lithium salts in the resin composition
Data Source
AI summary
According to the present invention, there can be provided a resin composition, comprising: a polycarbonate resin comprising a constituent unit represented by the following general formula (1):wherein R1 to R4 and R11 to R14 each independently hydrogen, fluorine, chlorine, bromine or iodine, etc., a represents an integer of 1 to 1,000, and X represents —S—, etc.; and a carbonate-based organic solvent, wherein the content of the polycarbonate resin in the resin composition is 0.05% to 50% by mass; the content of the carbonate-based organic solvent in the resin composition is 50% to 99.5% by mass, and the total percentage of constituent units represented by the following formulae (2) to (4) in all of the constituent units represented by the general formula (1) is 0% to 75% at a molar percentage: