Reduced Graphene Oxide Electrode Sheet for High-Capacity Storage
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Solution Overview
Problem
Current power storage devices, such as lithium-ion batteries, face challenges in achieving high capacity, high energy density, flexibility, long lifespan, and reliability while maintaining low characteristic reduction, particularly in electrode design.
Innovation Solution
A conductor with a sheet-like shape, composed of carbon and oxygen, including an aggregate of graphene with specific concentration and interlayer distance, and incorporating sulfur, is used as an electrode material. This conductor is formed by stacking graphene oxide sheets and subjecting them to reduction treatment, resulting in a high conductivity and flexible power storage device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrode materials are used to increase capacity, then energy density improves, but reliability and lifespan deteriorate
Solution Approach 1:
The patent employs a composite structure consisting of reduced graphene oxide (rGO) as the base material with metal oxide nanoparticles (such as MnO2, Co3O4, or NiO) dispersed throughout. This composite approach combines the high conductivity and structural stability of rGO with the high capacity of metal oxides, achieving both high capacity and long lifespan simultaneously
Solution Approach 2:
The patent creates local high-capacity regions by dispersing metal oxide nanoparticles throughout the rGO matrix. The metal oxide particles provide high capacity zones while the rGO provides structural stability and conductivity throughout, allowing different regions to contribute different properties to achieve overall high capacity and reliability
2Quantity of substance
If electrode thickness is increased to improve energy density, then capacity increases, but electrical conductivity deteriorates
Solution Approach 1:
The patent utilizes the two-dimensional sheet structure of reduced graphene oxide to create a thin-film electrode architecture. The rGO sheets provide extensive surface area for electroactive material deposition while maintaining excellent electrical conductivity through their planar structure, enabling high energy density without compromising conductivity
Solution Approach 2:
The patent transitions from traditional three-dimensional bulk electrode structures to a two-dimensional rGO-based architecture. This dimensional change increases the surface area-to-volume ratio, allowing more electroactive material to be exposed to electrolyte while maintaining short electron transport paths, thus achieving high energy density with preserved conductivity
3Strength
If rigid electrode structures are used to maintain structural integrity, then strength improves, but flexibility deteriorates
Solution Approach 1:
The patent employs reduced graphene oxide sheets as the electrode backbone, which inherently possess flexible two-dimensional structures. These thin-film rGO sheets can be bent and deformed without breaking, providing both mechanical strength for structural integrity and flexibility for adaptable device designs
Solution Approach 2:
The patent creates a dynamic electrode structure where rGO sheets can flex and adapt to mechanical deformation. The interconnected rGO network maintains electrical connectivity even when bent, allowing the electrode to dynamically adjust to different shapes and configurations while preserving both strength and flexibility
4Reliability
If high carbon concentration is used to improve conductivity, then electrical conductivity improves, but mechanical strength deteriorates
Solution Approach 1:
The patent creates a composite where reduced graphene oxide (high carbon content providing conductivity) is combined with metal oxide nanoparticles (providing mechanical strength). The rGO matrix ensures excellent electrical conductivity while the dispersed metal oxide particles reinforce the mechanical structure, achieving both high conductivity and strength simultaneously
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 provides a power storage device with enhanced capacity, energy density, flexibility, and reliability, with improved electrical conductivity and mechanical strength, while minimizing characteristic reduction.
Implementation Method 1
This conductor is formed by stacking graphene oxide sheets and subjecting them to reduction treatment, resulting in a high conductivity
Data Source
AI summary
A novel electrode is provided. A novel power storage device is provided. A conductor having a sheet-like shape is provided. The conductor has a thickness of greater than or equal to 800 nm and less than or equal to 20 μm. The area of the conductor is greater than or equal to 25 mm2 and less than or equal to 10 m2. The conductor includes carbon and oxygen. The conductor includes carbon at a concentration of higher than 80 atomic % and oxygen at a concentration of higher than or equal to 2 atomic % and lower than or equal to 20 atomic %.