Boron-Doped Nanodiamond Electrode Material for Higher Capacitor Energy Density
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Solution Overview
Problem
Electrochemical capacitors have limited storage capacity and energy density compared to secondary batteries, and metal oxide-based pseudo double-layer capacitors face challenges with low cell voltage and high costs due to the use of rare and expensive materials.
Innovation Solution
The use of boron-doped nanodiamond (BDND) with a specific surface area of 110 m2/g or greater and electrical conductivity of 5.0×10−3 S/cm or greater, combined with metal oxide, such as ruthenium oxide, at a specific proportion in the electrode, enhances dispersibility and electrochemically effective area, increasing storage capacity and energy density while reducing the amount of expensive metal oxide needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal oxide is used in the electrode to increase storage capacity through faradaic reaction, then storage capacity is improved, but cell voltage decreases and cost increases
Solution Approach 1:
The patent combines boron-doped diamond particles (providing high conductivity and stability) with metal oxide particles (providing faradaic reaction capability) to create a composite electrode material that merges the advantages of both materials, achieving high storage capacity while maintaining acceptable cell voltage
Solution Approach 2:
The electrode uses a composite material system consisting of boron-doped diamond particles, metal oxide particles, and binder, where the boron-doped diamond provides structural framework and conductivity while metal oxide provides pseudocapacitance, creating a material with superior overall performance
2Quantity of substance
If metal oxide is used in the electrode to increase storage capacity through faradaic reaction, then storage capacity is improved, but manufacturing cost increases due to use of rare and expensive materials
Solution Approach 1:
The patent combines boron-doped diamond particles (providing high conductivity and stability) with metal oxide particles (providing faradaic reaction capability) to create a composite electrode material that merges the advantages of both materials, achieving high storage capacity while maintaining acceptable cell voltage
Solution Approach 2:
The patent optimizes the particle size parameters of boron-doped diamond (D50: 1-100 nm) and metal oxide (D50: 1-100 nm) to maximize surface area and electrochemically active sites, thereby improving storage capacity per unit mass and reducing the total amount of expensive metal oxide required
3Area of stationary object
If boron-doped nanodiamond with large specific surface area is used, then electric double-layer capacitance is increased, but particle aggregation may occur reducing effectiveness
Solution Approach 1:
The patent combines boron-doped diamond particles (providing high conductivity and stability) with metal oxide particles (providing faradaic reaction capability) to create a composite electrode material that merges the advantages of both materials, achieving high storage capacity while maintaining acceptable cell voltage
Solution Approach 2:
The patent uses binder material as an intermediary substance to disperses and anchor the boron-doped diamond and metal oxide particles onto the current collector, preventing particle aggregation while maintaining high surface area and electrochemically active sites
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 combination results in an electrochemical capacitor with increased storage capacity, energy density, and output density, enabling rapid charging and discharging with high efficiency and long cycle life, suitable for power storage devices and electric vehicles, while reducing maintenance costs and power generation losses.
Implementation Method 1
when insulating diamond is doped with a high concentration of boron, holes are created (p-type semiconductors) and metallic conductivity is imparted
Implementation Method 2
at an interface where the electrode and an electrolytic solution contact, positive and negative charges are oriented at a very short distance to form an electric double layer
Implementation Method 3
charges can be stored due to a faradaic reaction process involving a redox reaction on the surface or in the vicinity of the surface of the metal oxide
Data Source
AI summary
Provided is an electrode-forming material for an electrochemical capacitor useful for forming an electrode of an electrochemical capacitor having a high storage capacity and a high energy density. The electrode-forming material for an electrochemical capacitor according to an embodiment of the present invention includes boron-doped nanodiamond (A) having a specific surface area of 110 m2/g or greater and an electrical conductivity at 20° C. of 5.0×10−3 S/cm or greater; and a metal oxide (B), and the content of the (B) is from 20 to 95 mass % with respect to the total content of the (A) and (B).