Core-Shell Conductive Slurry Polymer for Anti-Agglomeration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing conductive agents in secondary batteries agglomerate due to Van der Waals forces, leading to uneven distribution of electrode plates and reduced conductivity, necessitating the use of dispersants that affect slurry stability and production efficiency.
Innovation Solution
A core-shell structured polymer is developed, comprising a fluorine-containing core and a shell, optimized by controlling mass and molar content of specific monomers, which improves slurry viscosity, filterability, and reduces agglomeration without additional dispersants, enhancing electrode plate quality and battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive agents are added to improve conductivity, then battery performance is improved, but the conductive agents agglomerate due to Van der Waals forces, leading to uneven distribution and reduced effectiveness
Solution Approach 1:
The patent uses a core-shell structured polymer as an intermediary substance. The core contains conductive agent particles, while the shell is made of fluorine-containing polymer that prevents agglomeration. This intermediary structure allows conductive agents to be dispersed uniformly without direct contact between conductive agent particles, eliminating the Van der Waals attraction problem while maintaining conductivity enhancement.
Solution Approach 2:
The patent creates a composite material system where conductive agents are combined with fluorine-containing polymer in a core-shell structure. This composite approach integrates the high conductivity of conductive agents with the excellent dispersibility and anti-agglomeration properties of fluorine-containing polymers, achieving both improved conductivity and uniform distribution.
2Stability of the object's composition
If dispersants are added to prevent agglomeration, then distribution uniformity is improved, but slurry stability and production efficiency are affected
Solution Approach 1:
The core-shell structured polymer is self-service in nature. The fluorine-containing polymer shell inherently provides steric hindrance and electrostatic repulsion that prevents conductive agent agglomeration without requiring additional dispersants. The structure itself performs the dispersing function, eliminating the need for separate dispersant additives and simplifying the formulation process.
Solution Approach 2:
The patent applies local quality by concentrating the dispersing function in the shell layer of the core-shell structure. The fluorine-containing polymer in the shell provides localized steric hindrance and surface modification exactly where needed (at the conductive agent surface), preventing agglomeration without affecting the bulk slurry properties or requiring global additives.
3Ease of manufacture
If conventional polymers are used as binders, then processing is simplified, but the slurry exhibits settling and gelling issues, affecting storage performance
Solution Approach 1:
The patent changes the chemical parameters of the polymer binder by using fluorine-containing polymers with specific molecular weights and compositions. The fluorine atoms provide strong electrostatic repulsion and the specific molecular weight range (100,000-300,000) optimizes both processability and storage stability. This parameter optimization prevents gelling and settling while maintaining ease of manufacture.
Solution Approach 2:
The fluorine-containing polymer creates an inert-like environment around the conductive agents and active materials. The fluorine atoms form a protective barrier that prevents unwanted interactions between components, reducing gelling tendencies and improving storage stability without complicating the manufacturing process.
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 core-shell structured polymer improves dispersity and stability of the conductive slurry, reducing production costs and increasing efficiency by preventing gelling and settling, while maintaining optimal viscosity and adhesion, thus enhancing battery performance.
Implementation Method 1
the core-shell structured polymer improves dispersity, processing performance and storage performance of the conductive slurry... can alleviate the settling and agglomeration of a conductive agent
Implementation Method 2
the core containing a building block derived from a monomer represented by formula I... where R1, R2 and R3 are each independently selected from one or more of hydrogen, fluorine, chlorine
Implementation Method 3
the core-shell structured polymer can optimize viscosity of the slurry to enable the slurry to have excellent anti-settling property, anti-gelling property and filterability
Implementation Method 4
the core-shell structured polymer can optimize viscosity of the slurry to enable the slurry to have excellent anti-settling property
Data Source
AI summary
A core-shell structured polymer, a conductive slurry, a secondary battery, and an electrical apparatus. The core-shell structured polymer comprises a core and a shell at least partially covering the core. The core contains a building block derived from a monomer represented by formula I and a building block derived from a monomer represented by formula II, and the shell contains the building block derived from the monomer represented by the formula I and a building block derived from a monomer represented by formula III, where R1, R2 and R3 are each independently selected from one or more of hydrogen, fluorine, chlorine, and fluorine-substituted C1-3 alkyl, and R4, R5, R6, R7, R8 and R9 are each independently selected from one or more of hydrogen, substituted or unsubstituted C1-5 alkyl.