NiO/Fe2VO4 Nanocomposite Electrode for Higher Supercapacitor Energy Density
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Solution Overview
Problem
Current energy storage devices, such as batteries and supercapacitors, face limitations in power and energy density, with supercapacitors having high self-discharge rates and low energy density, while traditional single-material electrodes suffer from performance and structural defects.
Innovation Solution
A nanocomposite electrode comprising a substrate, binding compound, and NiO/Fe2VO4 nanoparticles with a spherical shape, aggregated and forming interconnected chains, is developed, along with a conductive additive, to enhance electrochemical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional single-material electrodes are used, then the electrode structure is simple, but the electrochemical performance and energy density are insufficient
Solution Approach 1:
The patent employs composite materials by combining NiO and Fe2VO4 nanoparticles into a NiO/Fe2VO4 nanocomposite electrode. This composite structure integrates the advantages of both materials: NiO provides high theoretical capacitance and catalytic activity, while Fe2VO4 offers structural stability and enhanced conductivity. The composite achieves superior energy density (250-300 F/g) compared to single-material electrodes, resolving the contradiction between performance improvement and structural complexity.
2Speed
If supercapacitors are used, then the charge and discharge rate is fast, but the energy density is low
Solution Approach 1:
The patent changes the physical and chemical parameters of the electrode material by synthesizing NiO/Fe2VO4 nanoparticles with controlled size (1-20 nm) and specific morphology. The nanoscale dimensions increase the surface area to volume ratio, enhancing both the charge/discharge rate and energy density. The specific capacitance reaches 250-300 F/g at current densities of 1-5 A/g, simultaneously improving both speed and energy storage capacity.
Solution Approach 2:
The patent applies local quality by creating a heterogeneous nanocomposite where NiO and Fe2VO4 particles are distributed at the nanoscale level. This local integration allows different regions of the electrode to contribute different functions: NiO regions provide high capacitance while Fe2VO4 regions provide structural support and conductivity pathways. This local differentiation enables the electrode to achieve both fast charge/discharge rates and high energy density.
3Reliability
If metal-based nanocomposites with multiple metals are developed, then the electrochemical performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing NiO and Fe2VO4 nanoparticles with controlled properties before combining them into the final composite electrode. This approach allows optimization of each component's characteristics (particle size, morphology, crystallinity) independently, ensuring high electrochemical performance. The pre-prepared nanoparticles are then easily incorporated into the electrode structure, reducing the overall manufacturing complexity compared to synthesizing the composite 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, improving energy storage capabilities and stability.
Implementation Method 1
The nanocomposite electrode achieves a specific capacitance of 250-300 Farad per gram at a current density of 1-5 ampere per gram, improving energy storage capabilities and stability.
Implementation Method 2
A nanocomposite electrode comprising a substrate, binding compound, and NiO/Fe2VO4 nanoparticles with a spherical shape, aggregated and forming interconnected chains, is developed, along with a conductive additive, to enhance electrochemical performance.
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.