Porous Conductive Polymer Electrode Layer for Current Collector Integrity
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Solution Overview
Problem
Electrochemical devices with conductive polymer electrodes experience stress-induced breakage of the electrode current collector during charging and discharging due to expansion and contraction, affecting device performance.
Innovation Solution
Incorporating an electrode material layer with a conductive polymer that has a log differential pore volume distribution with peaks in the range of 50 nm to 8000 nm, which alleviates stress on the electrode current collector and enhances adhesiveness, reducing the likelihood of breakage and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode material layer uses a conductive polymer capable of doping and dedoping, then the electrochemical device achieves reversible charge storage, but the expansion and contraction of the conductive polymer generate stress that causes breakage of the electrode current collector
Solution Approach 1:
The electrode material layer is designed with a porous structure having specific pore size distribution (peak at 50-8000 nm), which provides buffer space for the expansion and contraction of the conductive polymer during doping and dedoping cycles, thereby reducing stress transmission to the current collector while maintaining electrochemical activity
Solution Approach 2:
The electrode material layer comprises a composite structure of conductive polymer and porous supporting material, where the porous material provides mechanical support and stress absorption, preventing current collector breakage while the conductive polymer enables reversible charge storage through doping and dedoping
2Reliability
If the electrode material layer is closely attached to the electrode current collector, then the stress from conductive polymer expansion and contraction is transmitted to the current collector causing breakage, but reducing attachment may affect electrical conductivity and adhesion
Solution Approach 1:
The porous structure of the electrode material layer acts as a stress buffer, allowing the conductive polymer to expand and contract within the porous matrix without transmitting excessive stress to the current collector, while maintaining sufficient attachment for electrical conductivity
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 solution effectively suppresses breakage of the electrode current collector and improves the infiltration of electrolytic solution, reducing reaction resistance and enhancing capacitance while maintaining a good balance between infiltration and effective reaction area.
Implementation Method 1
The conductive polymer is capable of doping and dedoping of a dopant
Implementation Method 2
A log differential pore volume distribution of the electrode material layer has at least one peak in a range of a pore diameter of more than or equal to 50 nm
Data Source
AI summary
An electrochemical device includes a pair of electrodes and an electrolytic solution. At least one of the pair of electrodes includes an electrode current collector and an electrode material layer supported by the electrode current collector. The electrode material layer includes at least a conductive polymer. A log differential pore volume distribution of the electrode material layer has at least one peak in a range of a pore diameter of more than or equal to 50 nm.