Conductive Polymer Binder Composition for Battery Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conductive polymer binders face challenges with poor processability due to strong intermolecular forces and weak solvent interactions, leading to insolubility and reduced electrical conductivity, which complicates their use in electrode preparation and affects the performance of energy storage devices and sensors.
Innovation Solution
An integrated conductive polymer binder composition comprising 80 wt % to 99.99 wt % of a conductive polymer solution and 0.01 wt % to 20 wt % of an organic compound with multiple polar groups, such as alkyl group-substituted aromatic organic acids and polar sugars, which enhances solubility and adhesion, facilitating uniform conductivity and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer is used as a binder to improve electrical conductivity, then the electrical resistance is reduced, but the polymer exhibits poor solubility in organic solvents due to strong intermolecular forces
Solution Approach 1:
The patent applies parameter changes by modifying the molecular structure of the conductive polymer through controlled polymerization conditions (temperature, catalyst, monomer ratios) to achieve optimal balance between conductivity and solubility. The polymerization process parameters are specifically tuned to create polymers with desired molecular weight distributions and structural characteristics that enable both electrical conductivity and processability in organic solvents.
Solution Approach 2:
The patent employs composite materials by combining the conductive polymer with specific organic solvents and additives to create a binder composition that achieves both conductivity and solubility. The composite system includes the conductive polymer matrix combined with solvent systems and processing aids that enhance solubility while maintaining the electrical conductive properties of the polymer network.
2Reliability
If the degree of polymerization is increased to improve electrical conductivity, then the conductivity improves, but the dispersibility in solvent is reduced
Solution Approach 1:
The patent controls the degree of polymerization through specific polymerization parameters (monomer concentration, catalyst type, reaction temperature, reaction time) to achieve an optimal molecular weight range. This parameter control ensures that the polymer chains are long enough to provide electrical conductivity pathways but not so long that they aggregate and lose solubility. The patent specifies particular polymerization conditions that target a controlled degree of polymerization.
Solution Approach 2:
The patent introduces dynamic control of polymerization through staged or controlled polymerization processes where the degree of polymerization is adjusted during the synthesis process. This allows optimization of both conductivity and dispersibility by controlling the evolution of polymer chain length and structure during synthesis, rather than using a fixed one-step polymerization approach.
3Stability of the object's composition
If an excessive amount of polymer is used as the binder to reduce volumetric expansion, then the volumetric change is reduced, but the electrical resistance is increased due to the insulating property of the binder
Solution Approach 1:
The patent changes the fundamental parameter of the binder from insulating to conductive by using a conductive polymer. This allows the binder to simultaneously provide mechanical binding function and electrical conductivity, eliminating the need to balance between binder amount for structural stability versus conductivity. The conductive polymer binder maintains its conductive properties even at higher concentrations needed for structural support.
Solution Approach 2:
The conductive polymer binder serves multiple functions simultaneously: it provides mechanical binding between active materials and current collector, suppresses volumetric expansion through its polymeric structure, and maintains electrical conductivity through its conductive properties. This multi-functionality resolves the contradiction by allowing the binder to fulfill both structural and electrical roles without compromise.
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 composition exhibits excellent durability, coating performance, and electrochemical properties, reducing production costs and improving the performance of energy storage devices and sensors by acting as a self-electrode and conductive binder, while maintaining anticorrosive properties.
Implementation Method 1
A binder provides binding strength between active materials, between the active material and a current collector
Implementation Method 2
an organic compound that has multiple polar groups, such as alkyl group-substituted aromatic organic acids and polar sugars, which enhances solubility
Implementation Method 3
proposals for using a conductive polymer such as polyacetylene or polyaniline, and the like, as a binder to improve the conductivity and reduce the internal resistance of a battery
Data Source
AI summary
The present invention relates to a polymer binder composition, and more specifically, to an integrated conductive polymer binder composition simultaneously having adhesion and conductivity, a method for preparing the binder composition, an energy storage device comprising the binder composition, a sensor comprising a sensing portion formed from the binder composition, and an anticorrosive coating composition comprising the binder composition as an active component.