Copolymer Dispersant Viscosity Control for Lithium Ion Battery
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Solution Overview
Problem
Current methods for adjusting the viscosity of dispersion materials containing crystalline polymer fine particles are limited, leading to difficulties in handling and energy efficiency, particularly in rechargeable lithium ion batteries, where high viscosity hinders the permeation of electrolytic solutions and increases electric resistance, and existing dispersants fail to effectively reduce viscosity or require complex control mechanisms.
Innovation Solution
A method using a copolymer dispersant comprising a first monomer crystallizable as a polymer with a molecular structure identical to the dispersed particles, selected from various monomers such as ethylene, (meth)acrylates, and vinyl esters, which can adjust the viscosity of the dispersion material by changing temperature, allowing for the reduction or increase of viscosity within a predetermined range, thereby improving handling and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of fine particles of crystalline polymer is increased to improve energy density, then the concentration of dispersion material increases, but the viscosity sharply increases making it difficult to handle
Solution Approach 1:
A dispersant comprising a copolymer of a first monomer and a second monomer is introduced as an intermediary substance. The first monomer is a monomer crystallizable as a polymer having a molecular structure identical to that of the dispersed particle, while the second monomer is a (meth)acrylate, (meth)acrylamide, vinyl ether, vinyl ester, maleic acid ester, itaconic acid ester, or acrylamide. This dispersant mediates between the crystalline polymer particles and the dispersion medium, reducing viscosity and enabling high concentration dispersion to be handled easily.
2Ease of operation
If conventional dispersants are used to reduce viscosity, then handleability improves, but complex control mechanisms are required
Solution Approach 1:
The dispersant system operates on self-service principles where the copolymer dispersant automatically adjusts to the dispersion requirements. The specific composition of the dispersant (first monomer matching the dispersed particle structure and second monomer providing dispersion functionality) enables the system to self-regulate viscosity without requiring complex external control mechanisms, temperature adjustments, or additional equipment.
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 method significantly reduces viscosity, enabling easier application and higher concentration of fine particles, improving energy efficiency and reducing electric resistance in lithium ion batteries, while eliminating the need for complex control mechanisms, thus enhancing the performance and safety of rechargeable lithium ion batteries.
Implementation Method 1
a dispersant comprising a copolymer of a first monomer and a second monomer... significantly reduces viscosity
Implementation Method 2
adjust the viscosity of the dispersion material by changing temperature, allowing for the reduction or increase of viscosity within a predetermined range
Data Source
AI summary
A dispersant of the present invention is used after being added to a dispersant obtained by dispersing fine particles of a crystalline polymer as a dispersed particle and is characterized by containing a copolymer of a first monomer and a second monomer, the first monomer being a monomer that can be crystallized as a polymer having the molecular structure identical to that of the dispersed particle.