Secondary Battery Electrode with Reactive Functional Groups
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Solution Overview
Problem
The existing electrodes for secondary batteries, such as lithium-ion batteries, face an increase in internal resistance due to the use of a significant amount of binder, which compromises the energy density and output performance.
Innovation Solution
An electrode design featuring a current collecting foil with reactive functional groups and a mixture layer containing an active material, carbon nanotubes with surface functional groups that react with these functional groups, reducing the need for a high binder content by enhancing the bonding between the foil and the mixture layer, thereby decreasing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a significant amount of binder is added to the mixture layer to ensure bonding between the current collecting foil and the mixture layer, then the bonding strength is improved, but the internal resistance of the battery increases
Solution Approach 1:
Carbon nanotubes with surface functional groups serve as an intermediary bonding agent between the current collecting foil and the active material. The surface functional groups on carbon nanotubes react with reactive functional groups on the foil surface, creating a chemical bridge that enhances bonding without requiring excessive binder material.
Solution Approach 2:
The invention changes the chemical parameters of the carbon nanotubes by introducing surface functional groups (such as carboxyl, hydroxyl, or amine groups) that can chemically interact with the foil surface. This chemical modification enables strong bonding through chemical reactions rather than relying solely on physical adhesion from binders.
2Stability of the object's composition
If the amount of binder is increased to stabilize the electrode material, then the binding property is improved, but the energy density decreases
Solution Approach 1:
Carbon nanotubes with surface functional groups act as a mediator that provides stable bonding between the foil and active material. This intermediary structure creates a robust interface that stabilizes the electrode composition without requiring large amounts of binder, thus preserving energy density.
Solution Approach 2:
The invention creates a composite structure where carbon nanotubes with surface functional groups are integrated with the active material and foil. This composite material system combines the mechanical stability of carbon nanotubes with the electrochemical activity of the active material, achieving both stability and high energy density.
3Reliability
If the amount of binder is increased to ensure stable fixation of electrode material, then the fixation stability is improved, but the output performance decreases
Solution Approach 1:
Carbon nanotubes with surface functional groups serve as an intermediary that provides stable fixation of electrode material to the foil. This intermediary structure creates strong chemical bonds that ensure fixation stability while maintaining the electrical conductivity needed for high output performance.
Solution Approach 2:
The invention changes the bonding mechanism from physical adhesion (binder-based) to chemical bonding (functional group-based). This parameter change in the bonding mechanism achieves stable fixation while preserving electrical pathways, thereby maintaining high output performance.
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
This configuration results in an electrode with high durability and reduced internal resistance, allowing for increased energy density and output characteristics while minimizing the binder amount.
Implementation Method 1
carbon nanotubes including surface functional groups reactive with the reactive functional groups
Data Source
AI summary
An electrode for a secondary battery having high durability while reducing the internal resistance of the battery, and a method for manufacturing the electrode for a secondary battery are provided. An electrode for a secondary battery includes a current collecting foil including reactive functional groups on a front surface and a mixture layer formed on the front surface of the current collecting foil and including an active material, a binder, and carbon nanotubes including surface functional groups reactive with the reactive functional groups. More functional groups derived from the surface functional groups are present in the vicinity of the rear surface of the mixture layer than in the vicinity of the front surface of the mixture layer.