Multilayer Supercapacitor Electrode with Electrochemical Deposition
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Solution Overview
Problem
Existing solid-state supercapacitors face challenges in achieving high specific capacitance and consistent electrode conductivity due to variations in conductive material distribution across the substrate, particularly when using aerogel or sponge-based substrates.
Innovation Solution
The development of a multilayer electrode structure on a sponge substrate using in-situ self-assembled polymerization of polypyrrole (PPy) and polyaniline (PANI), followed by electrochemical deposition of PANI-molybdenum disulfide (MoS2), integrated with a polyvinyl alcohol (PVA) gel electrolyte to enhance conductivity and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aerogel or sponge-based substrates are used with dip coating or mechanical pressing of conductive materials, then the manufacturing process is simple and large surface area is provided, but the electrode conductivity varies in different parts of the substrate
Solution Approach 1:
The patent replaces mechanical pressing methods with electrochemical deposition to deposit conductive polymer layers. This substitution ensures uniform conductivity distribution across the substrate by using electrochemical fields rather than mechanical force, resolving the contradiction between simple manufacturing and uniform conductivity.
Solution Approach 2:
The patent controls deposition parameters such as electrochemical potential, deposition time, and monomer concentration to achieve uniform conductive polymer coating. By optimizing these parameters, the method ensures consistent electrode conductivity across the entire substrate surface while maintaining manufacturing simplicity.
2Device complexity
If conventional electrode materials and structures are used, then the device structure is simple, but the specific capacitance is limited
Solution Approach 1:
The patent employs composite electrode structures combining conductive polymers (PPy, PANI) with porous substrates (sponge, aerogel) and electrochemically deposited metal oxide layers. These composite materials provide high specific capacitance through synergistic effects while maintaining relatively simple device architecture.
Solution Approach 2:
The patent utilizes porous substrates such as sponges and aerogels as electrode bases. The porous structure provides high surface area to volume ratio, enabling increased capacitance without significantly increasing device volume or complexity, thus resolving the contradiction between simple structure and high capacitance.
3Quantity of substance
If high surface area substrates are used to enhance capacitance, then the specific capacitance increases, but the electrode conductivity becomes non-uniform
Solution Approach 1:
The patent replaces mechanical coating methods with electrochemical deposition on high surface area substrates. The electrochemical field ensures uniform distribution of conductive polymer throughout the porous structure, maintaining both high capacitance from the large surface area and uniform conductivity distribution.
Solution Approach 2:
The electrochemical deposition process is self-regulating, where the deposition rate automatically adjusts based on local current density and monomer availability. This self-service mechanism ensures uniform conductive material distribution throughout the porous substrate without requiring complex external control systems.
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 results in a solid-state supercapacitor with a high specific capacitance of 631.6 F g−1, improved power density, and excellent cycle durability, stability, and shelf life, overcoming the limitations of previous technologies.
Implementation Method 1
depositing conducting polypyrrole (PPy) and polyaniline (PANI) on the surface of sponge using in-situ self-assembled polymerization technique
Implementation Method 2
in-situ self-assembled polymerization of polypyrrole (PPy) and polyaniline (PANI)
Implementation Method 3
electrochemical PANI and molybdenum disulfide (MoS2)-PANI are deposited by electrochemical techniques to form the electrodes
Implementation Method 4
polyaniline, polyaniline-graphene and polypyrrole, polypyrrole graphene are polymerized in PVA gel to obtain highly conducting electrolyte
Data Source
AI summary
A novel electrode and associated method of manufacturing said novel electrode comprising a porous structure having absorbed polystyrene sulfonate (PSS), a self-assembled polypyrole (PPy) layer adjacent to the PSS absorbed porous structure, a self-assembled polyaniline (PANI) layer adjacent to the PPy layer, an electrochemically deposited PANI layer adjacent to the PPy layer and an electrochemically deposited PANI-molybdenum disulfide (PANI-MoS2) layer adjacent to the electrochemically deposited PANI layer. A supercapacitor and associated method of manufacturing a supercapacitor comprising a first novel electrode and a second novel electrode separated by a polyvinyl gel and a porous separator.