Self-healing Battery Electrode Binders
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Solution Overview
Problem
Conventional battery electrodes and polymers lack self-healing capabilities, leading to mechanical fractures and reduced lifespan due to volumetric changes during cycling, which results in loss of electrical contact and capacity decay.
Innovation Solution
Development of self-healing composites with a cross-linked polymeric matrix and conductive additives, where the matrix is formed through reversible bonds, allowing for autonomous repair of mechanical damages and maintaining electrical conductivity at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional battery electrodes are used, then manufacturing is simple, but mechanical fractures occur due to volumetric changes during cycling
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating self-healing polymer components with specific functional groups (amines, carboxylic acids, phenols) that form reversible bonds. This allows the binder to dynamically adapt its mechanical properties during cycling, maintaining strength while accommodating volumetric changes of electrochemically active materials.
Solution Approach 2:
The patent creates a composite binder system combining conventional polymer binders with self-healing polymer components. This composite structure integrates the mechanical stability of conventional binders with the self-healing capabilities of the polymer system containing reversible bonding groups, resolving the contradiction between simple manufacturing and improved cycle life.
2Reliability
If self-healing polymers are incorporated into battery electrodes, then cycle life is extended, but device complexity increases
Solution Approach 1:
The self-healing polymer binder autonomously repairs mechanical damages through reversible bond formation without requiring external intervention. The functional groups (amines, carboxylic acids, phenols) automatically re-bond at fracture sites during cycling, extending cycle life while maintaining a relatively simple overall electrode structure that processes similarly to conventional electrodes.
3Reliability
If mechanical fractures occur in battery electrodes, then electrical contact is lost, but the fractures result from volumetric changes during cycling
Solution Approach 1:
The patent introduces dynamic reversible bonds into the binder structure that can continuously form and break during cycling. This dynamic characteristic allows the binder to adapt to volumetric changes of electrochemically active materials, maintaining structural stability and electrical contact despite the changing volume during charge-discharge cycles.
Solution Approach 2:
The reversible bonding mechanism changes the structural parameters of the binder dynamically during cycling. The functional groups (amines, carboxylic acids, phenols) adjust their bonding state in response to volumetric changes, maintaining electrical contact stability while accommodating structural variations without permanent fracture.
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 self-healing composites demonstrate extended cycle life, maintaining high capacity and conductivity, with the ability to spontaneously heal cracks and maintain electrical contact, significantly improving the durability and performance of battery electrodes.
Implementation Method 1
a cross-linked polymeric matrix and conductive additives, where the matrix is formed through reversible bonds, allowing for autonomous repair of mechanical damages
Implementation Method 2
conductive additives dispersed in the matrix. The self-healing composite has an electrical conductivity of at least 1 S/cm
Implementation Method 3
the piezoresistive sensor includes a self-healing polymer including a matrix formed of molecules cross-linked through reversible bonds
Data Source
AI summary
A battery electrode includes an electrochemically active material and a binder covering the electrochemically active material. The binder includes a self-healing polymer and conductive additives dispersed in the self-healing polymer to provide an electrical pathway across at least a portion of the binder.