Co-Doped Porous Graphene Electrodes for Higher Conductivity
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Solution Overview
Problem
Existing carbon-containing electrode materials suffer from inferior electrochemical properties, short shelf-life, insufficient doping efficiency, use of hazardous chemicals, limited binder compatibility, lack of versatility, and scalability/manufacturing challenges.
Innovation Solution
Development of nitrogen and sulfur co-doped porous graphene (NSPG) electrode materials, which enhance electrical conductivity, introduce additional redox active sites, and modulate the electronic structure for improved energy storage capacity and electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon-containing electrode materials are used, then basic electrochemical function is provided, but electrochemical properties are inferior
Solution Approach 1:
The patent applies parameter changes by doping graphene with nitrogen and sulfur atoms, which fundamentally alters the electronic structure and chemical properties of the carbon material. This doping introduces new active sites and modifies conductivity, directly improving electrochemical performance and energy storage capacity while maintaining the base carbon material structure.
Solution Approach 2:
The patent creates a composite material system by combining graphene with metal oxides (such as MnO2, RuO2, Co3O4) and conducting polymers (such as polyaniline, polypyrrole, PEDOT). This composite approach leverages the high conductivity of graphene, the high specific capacitance of metal oxides, and the reversible redox activity of polymers to achieve superior overall electrochemical properties.
2Duration of action of stationary object
If conventional electrode materials are used, then manufacturing is simple, but shelf-life is short
Solution Approach 1:
The doping process modifies the chemical stability and electrochemical durability of graphene through nitrogen and sulfur incorporation. These parameter changes enhance the material's resistance to degradation during cycling and storage, extending shelf-life and operational duration while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The composite structure of graphene with metal oxides and polymers creates a synergistic system where each component contributes to durability. The metal oxides provide structural stability, the polymers offer flexible redox couples for sustained activity, and graphene ensures continuous conductivity, collectively extending the electrode's operational life.
3Reliability
If undoped graphene is used, then basic conductivity is provided, but electrical conductivity is insufficient
Solution Approach 1:
Nitrogen and sulfur doping fundamentally changes the electronic parameters of graphene by introducing dopant atoms with different electronegativities and orbital configurations. This creates charge carriers, modifies the band structure, and enhances electrical conductivity by 1-2 orders of magnitude compared to undoped graphene, directly improving charge transfer kinetics.
4Quantity of substance
If simple carbon materials are used, then material availability is good, but active sites are insufficient
Solution Approach 1:
Doping graphene with nitrogen and sulfur introduces new active sites through heteroatom functional groups and defect structures. These dopant atoms create additional redox centers and enhance the material's ability to interact with electrolyte ions, increasing the number of active sites and specific capacitance.
Solution Approach 2:
The composite structure combines graphene's high surface area with the redox-active metal oxides and polymers. The metal oxides (MnO2, RuO2, Co3O4) provide pseudocapacitive sites, while the conducting polymers (polyaniline, polypyrrole, PEDOT) contribute reversible redox couples, collectively multiplying the number of active sites beyond what pure carbon can provide.
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
NSPG electrodes exhibit a 1 to 2 orders of magnitude increase in electrical conductivity, 100 to 300 times improvement in conductivity, and 10% to 50% increase in active sites compared to undoped graphene, with greater than 80% capacity retention over numerous charge/discharge cycles and high specific capacity.
Implementation Method 1
nitrogen and sulfur co-doped porous graphene (NSPG) electrode materials, which enhance electrical conductivity, introduce additional redox active sites, and modulate the electronic structure
Implementation Method 2
NSPG electrodes exhibit a 1 to 2 orders of magnitude increase in electrical conductivity, 100 to 300 times improvement in conductivity
Implementation Method 3
greater than 80% capacity retention over numerous charge/discharge cycles and high specific capacity
Data Source
AI summary
This invention relates generally to the field of energy storage, batteries, electrodes, including electrode materials and methods to make the electrodes materials comprising graphene and/or graphene with a plurality of dopants. This invention also relates to anode materials and/or cathode materials and methods to make said materials.