Carbon Nanotube Structural Network for Lithium Battery Electrodes
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Solution Overview
Problem
Existing secondary cell electrodes face challenges in balancing conductivity and binding strength due to the non-adhesive nature of conductive materials and the non-conductive properties of binders, leading to potential electrical disconnection and cracking during charging and discharging operations.
Innovation Solution
The use of a structural network comprising carbon nanotubes and a binder in the active material layer, where carbon nanotubes form a three-dimensional conductive network connected by the binder, acting as a supporting framework to maintain uniform electric potential and prevent cracking, while also serving as a conductive material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive material is added to increase conductivity, then charging and discharging characteristics are improved, but the material can be electrically disconnected due to cracks because it is not adhesive
Solution Approach 1:
The patent combines conductive material and binder into a single integrated component - carbon nanotubes that inherently possess both conductive properties and adhesive characteristics. This merging eliminates the need for separate conductive material and binder layers, resolving the contradiction between conductivity and adhesive strength by making one material fulfill both functions simultaneously.
Solution Approach 2:
The patent uses carbon nanotubes as a composite material that integrates the functions of both conductive material and binder. The carbon nanotube structure provides electrical conductivity while its surface properties and ability to form networks provide adhesive strength, creating a composite solution that simultaneously addresses both requirements without the drawbacks of using separate materials.
2Strength
If binder is added to prevent cracks and improve binding strength, then structural integrity is improved, but conductivity decreases because the binder is not conductive
Solution Approach 1:
The patent merges the functions of binder and conductive material into a single carbon nanotube component. The carbon nanotubes form a network structure that provides both mechanical binding strength to prevent cracks and electrical conductivity pathways, eliminating the trade-off between binding strength and conductivity that exists when using traditional separate binder and conductive material layers.
Solution Approach 2:
The carbon nanotube network acts as a composite material that simultaneously provides mechanical support and electrical conductivity. Unlike traditional binders that require separate conductive additives, the carbon nanotubes themselves form a conductive composite structure that maintains both structural integrity and electrical pathways throughout the electrode.
3Reliability
If both conductive material and binder are included to improve both conductivity and binding strength, then charging and discharging characteristics can be improved, but material usage and complexity increase
Solution Approach 1:
The patent applies the merging principle by combining what were traditionally separate components (conductive material and binder) into a single carbon nanotube component. This reduces the number of layers and materials needed in the electrode structure while maintaining or improving both conductivity and binding strength, thereby simplifying the overall device complexity.
Solution Approach 2:
The carbon nanotube serves multiple functions simultaneously: it acts as a conductive material, a binder, and a structural support framework. This multi-functionality eliminates the need for separate dedicated conductive layers and binder layers, reducing material usage and simplifying the electrode structure while achieving improved charging and discharging characteristics.
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 approach enhances the cycle-life characteristics of lithium batteries by maintaining uniform electric potential and preventing cracking, thereby improving both conductivity and binding strength without using excessive materials.
Implementation Method 1
carbon nanotubes form a three-dimensional conductive network... maintaining uniform electric potential
Implementation Method 2
a structural network comprising a network of carbon nanotubes and a binder... carbon nanotubes form a three-dimensional conductive network connected by the binder
Data Source
AI summary
An electrode including a current collector, and an active material layer disposed on the current collector. The active material layer includes a structural network and an active material composition. The structural network includes a network of carbon nanotubes and a binder. The active material composition includes an active material and a polar medium.