Lithium Battery Electrode Coating for Adhesion-Conductivity Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rechargeable lithium batteries face a trade-off between adhesive strength and conductivity due to the use of binders like CMC and PVdF, which limits their cycle-life characteristics.
Innovation Solution
Incorporating a compound with a catechol functional group, a quinone functional group, or a combination thereof into the conductive coating layer of the electrode, allowing for reduced binder usage while maintaining or improving adhesive strength and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of binder is increased to improve adhesive strength, then adhesive strength is improved, but conductivity decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the conductive coating layer by introducing compounds with catechol or quinone functional groups. These compounds provide strong chelation ability that enhances adhesive strength without requiring increased binder content, thereby maintaining conductivity while improving adhesion.
Solution Approach 2:
The invention creates a composite conductive coating layer containing conductive material, binder, and compounds with catechol/quinone functional groups. This composite structure synergistically combines the adhesive properties of the catechol/quinone compounds with the conductive properties of the conductive material, resolving the trade-off between adhesion and conductivity.
2Reliability
If the amount of conductive material is increased to improve conductivity, then conductivity is improved, but adhesive strength decreases
Solution Approach 1:
The invention modifies the chemical composition by adding compounds with catechol or quinone functional groups that provide strong chelation ability. This allows the conductive coating layer to maintain high conductivity through increased conductive material content while compensating for reduced adhesive strength through the chelation effect of the catechol/quinone compounds.
3Strength
If conventional binders (CMC, PVdF) are used to provide adhesive strength, then adhesive strength is achieved, but cycle-life characteristics deteriorate due to the trade-off between adhesion and conductivity
Solution Approach 1:
The invention changes the chemical composition by incorporating compounds with catechol or quinone functional groups that provide strong chelation ability. This allows for reduced binder content while maintaining adhesive strength, and the improved conductivity resulting from higher conductive material content enhances cycle-life characteristics by reducing resistance increase during operation.
Solution Approach 2:
The invention creates a composite conductive coating layer that combines conventional binder with compounds having catechol/quinone functional groups and conductive material. This composite structure achieves both sufficient adhesive strength and high conductivity, thereby improving cycle-life characteristics without the limitations of using only conventional binders.
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 electrode exhibits excellent adhesive strength and conductivity, leading to improved cycle-life characteristics of the rechargeable lithium battery by minimizing resistance increase and energy density decrease during operation.
Implementation Method 1
a compound including a catechol functional group, a quinone functional group, or a combination thereof
Implementation Method 2
a conductive coating layer on the current collector; and an active material layer on the conductive coating layer, wherein the conductive coating layer includes a conductive material
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are an electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same, the electrode including a current collector; a conductive coating layer on the current collector; and an active material layer on the conductive coating layer, wherein the conductive coating layer includes a conductive material; a binder; and a compound including a catechol functional group, a quinone functional group, or a combination thereof.