NiO/Fe2VO4 Nanocomposite Electrode for Higher-Capacitance Supercapacitors
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Solution Overview
Problem
Current supercapacitors face challenges with low energy density and high self-discharge rates, despite their fast charge and discharge capabilities, primarily due to limitations in electrode materials.
Innovation Solution
A nanocomposite electrode comprising NiO/Fe2VO4 nanoparticles, a substrate, a binding compound, and a conductive additive, which are coated on a substrate surface to enhance electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-material electrode materials are used, then the electrode structure is simple and easy to manufacture, but the electrochemical performance (specific capacitance, charge capacity, electrical conductivity) is insufficient
Solution Approach 1:
The patent applies composite materials by combining NiO nanoparticles with Fe2VO4 nanoparticles to create a nanocomposite electrode material. This composite structure integrates the advantages of both materials: NiO provides high specific capacitance through surface redox reactions, while Fe2VO4 contributes to electrical conductivity and structural stability. The synergistic effect of this composite material resolves the technical contradiction by achieving superior electrochemical performance compared to single-material electrodes, while maintaining a manageable structural complexity through controlled nanoparticle aggregation into chain-like structures.
2Use of energy by moving object
If supercapacitors use conventional electrode materials, then the device structure is simple, but the energy density is low and self-discharge rate is high
Solution Approach 1:
The patent applies parameter changes by optimizing the nanoscale dimensions of the electrode materials. By reducing NiO and Fe2VO4 to nanoparticle size (1-20 nm) and arranging them in chain-like aggregates (1-50 μm), the material parameters are fundamentally altered to enhance surface area-to-volume ratio, improve ion transport kinetics, and increase active sites for electrochemical reactions. This nanoscale parameter transformation enables higher energy density while the interconnected chain structure reduces self-discharge by providing efficient electron pathways and stabilizing the electrochemical environment.
3Quantity of substance
If single-material electrodes are used, then the manufacturing process is simple, but the charge capacity and electrical conductivity are insufficient
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing NiO and Fe2VO4 nanoparticles with controlled size and morphology before combining them into the composite electrode structure. This preliminary preparation of nanomaterials with optimized properties (1-20 nm particles, spherical shape) allows for better dispersion and aggregation control during electrode fabrication. The pre-formed nanoparticles are then combined with conductive additives and binding agents to create the final electrode, which achieves high charge capacity while simplifying the overall manufacturing process compared to synthesizing complex composite structures in a single step.
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 nanocomposite electrode achieves a specific capacitance of 250-300 Farad per gram at a current density of 1-5 ampere per gram, with improved charge capacity and electrical conductivity, addressing the limitations of traditional single-material electrodes.
Implementation Method 1
Iron, nickel, and vanadium-based nanocomposites have been reported as electrode materials with enhanced redox behaviors, charge capacity and electrical conductivity
Implementation Method 2
Iron, nickel, and vanadium-based nanocomposites have been reported as electrode materials with enhanced redox behaviors, charge capacity and electrical conductivity
Data Source
AI summary
A nanocomposite electrode including a substrate, a binding compound, a conductive additive, and NiO/Fe2VO4 nanoparticles. The NiO/Fe2VO4 nanoparticles have a substantially spherical shape. A mixture of the binding compound, the conductive additive and the NiO/Fe2VO4 nanoparticles, is at least partially coated on a first surface of the substrate. A method of making the NiO/Fe2VO4 nanoparticles is described.