Conductive Polymer Doping for Battery Electrode Capacity
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Solution Overview
Problem
Conductive polymers used in secondary electric energy storage devices have limited electron conductivity compared to conventional conductive agents, restricting the amount of electrode active material and thus the capacity and output of energy storage devices.
Innovation Solution
A novel doping method is applied to conductive polymers by introducing a dopant and applying a voltage higher than the conduction band, increasing movable charges and electron conductivity, allowing the polymer to function as both a binder and a conductive agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive agents (carbonaceous materials) are used to achieve high electron conductivity, then the electron conductivity is improved, but the capacity of the energy storage device is reduced due to the large amount of polymer binder and conductive agent required (5-10 wt% or more)
Solution Approach 1:
The conductive polymer is designed to perform multiple functions simultaneously: it acts as both the binder that holds the electrode structure together and as the conductive agent that provides electron transport pathways. This multi-functionality eliminates the need for separate binder and conductive agent components, thereby increasing the proportion of active material in the electrode and improving device capacity while maintaining high electron conductivity.
Solution Approach 2:
The invention merges the previously separate functions of binder and conductive agent into a single conductive polymer component. By combining these two distinct roles into one material, the electrode composition is simplified, reducing the total weight percentage of non-active materials and increasing the active material content, thus improving capacity without sacrificing conductivity.
2Reliability
If the amount of polymer binder and conductive agent is increased to ensure adequate conductivity and structural integrity, then the electron conductivity is improved, but the capacity of the energy storage device is reduced
Solution Approach 1:
The conductive polymer serves dual purposes as both binder and conductive agent, eliminating the need for separate components. This reduces the total weight percentage of non-active materials from 5-10 wt% or more to a much lower amount, thereby increasing the proportion of active material and improving device capacity while maintaining adequate electron conductivity and structural integrity.
3Quantity of substance
If a novel material is introduced to function as both binder and conductive agent to increase active material amount, then the capacity is improved, but the electron conductivity may be insufficient compared to conventional conductive agents
Solution Approach 1:
The conductivity of the conductive polymer is enhanced by modifying its chemical structure and doping state. By adjusting parameters such as the degree of conjugation, molecular weight, and dopant concentration, the polymer achieves electron conductivity levels comparable to conventional carbonaceous conductive agents, while simultaneously functioning as an effective binder and contributing to device capacity.
Solution Approach 2:
The conductive polymer is designed as a composite material that combines the binding properties of polymers with the high conductivity characteristics of conductive agents. This composite structure allows the material to exhibit both adequate electron conductivity and effective binding capability, enabling it to replace traditional separate binder and conductive agent components.
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 modified conductive polymer achieves electron conductivity comparable to conventional conductive agents, enabling a significant increase in electrode active material, enhancing the capacity and output of energy storage devices while maintaining the polymer's physical properties.
Implementation Method 1
a step of doping a conductive polymer with a dopant capable of introducing movable charge carriers into the repeating units of the polymer
Implementation Method 2
wherein a voltage higher than the conduction band of the polymer is applied to the polymer while the polymer is doped with the dopant, so as to modify the electron conductivity of the conductive polymer
Data Source
AI summary
Disclosed is a method for preparing a highly electron conductive polymer, the method comprising a step of doping a conductive polymer with a dopant capable of introducing movable charge carriers into the repeating units of the polymer, wherein a voltage higher than a conduction band of the polymer is applied to the polymer while the polymer is doped with the dopant, so as to modify electron conductivity of the conductive polymer. A highly electron conductive polymer obtained by the method, an electrode comprising the highly electron conductive polymer, and an electrochemical device including the electrode are also disclosed. The novel doping method for improving the electron conductivity of a conductive polymer can provide a conductive polymer with a conductivity comparable to the conductivity of a conventional conductive agent.