Gel Electrolyte Supercapacitor Electrodes for High Cycle Stability
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Solution Overview
Problem
Current supercapacitors face limitations in achieving high specific capacity, specific energy, rate capability, and cycle performance, particularly when using traditional electrodes, which often result in reduced efficiency and durability.
Innovation Solution
The development of nanocomposite electrodes comprising a substrate coated with a mixture of a binding compound, conductive additive, and molybdenum-doped carbon materials, such as molybdenum-doped graphene and carbon nanotubes, which are synthesized through a method involving heating, sonicating, and pH adjustment to form a dispersion, followed by mixing MoO42− molybdate ions and drying to create a molybdenum-doped carbon material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrodes are used in supercapacitors, then the device structure is simple and easy to manufacture, but the specific capacity, specific energy, rate capability, and cycle performance are limited
Solution Approach 1:
The patent uses composite materials by combining molybdenum oxide nanoparticles with carbon nanotubes or graphene to create nanocomposite electrodes. This composite structure integrates the high surface area and conductivity of carbon materials with the faradaic reaction capabilities of molybdenum oxide, achieving enhanced cycle performance and specific capacity while maintaining structural integrity over thousands of charge-discharge cycles.
Solution Approach 2:
The patent applies local quality by creating heterogeneous electrode structures where molybdenum oxide nanoparticles are distributed throughout the carbon matrix. Different regions of the electrode perform different functions: carbon nanotubes/graphene provide structural framework and electrical conductivity, while molybdenum oxide nanoparticles contribute faradaic reactions. This localized functional distribution optimizes both performance and durability.
2Use of energy by moving object
If molybdenum oxide is integrated with carbon nanomaterials to enhance energy density, then specific energy and rate capability improve, but the electrode preparation process becomes more complex
Solution Approach 1:
The patent employs preliminary action by pre-synthesizing molybdenum oxide nanoparticles through hydrothermal treatment before integrating them with carbon nanotubes or graphene. This pre-preparation step allows for controlled formation of the active material with optimized morphology and size, which then simplifies the subsequent electrode fabrication process by enabling direct mixing and coating without requiring complex in-situ synthesis during electrode manufacturing.
3Quantity of substance
If nanocomposite electrodes with high loading of molybdenum doped carbon material are used, then specific capacitance and energy density increase, but the conductivity of the electrode may decrease
Solution Approach 1:
The patent applies parameter changes by systematically varying the loading ratio of molybdenum doped carbon material to conductive additive in the electrode composition. By optimizing this parameter, the patent achieves the right balance where sufficient active material provides high specific capacitance while adequate conductive additive maintains electrical conductivity for fast charge-discharge rates. The patent specifically uses ratios that maximize capacitance while preventing excessive resistance.
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 electrodes demonstrate enhanced specific capacitance, energy density, and cycle stability, maintaining at least 88-90% of initial capacitance after 10,000 charge-discharge cycles, with flexible and wearable device applications, and the ability to power electronic devices efficiently.
Implementation Method 1
heating, sonicating, and pH adjustment to form a dispersion
Implementation Method 2
heating, sonicating, and pH adjustment to form a dispersion
Implementation Method 3
supercapacitors have been positioned as new energy-storage devices, which use electrochemical porous or activated materials as electrodes
Data Source
AI summary
A nanocomposite electrode and a supercapacitor device including said nanocomposite electrode. The nanocomposite electrode includes a mixture of at least one binding compound, at least one conductive additive, and at least one molybdenum doped carbon material coated onto a substrate. The supercapacitor device includes two nanocomposite electrodes disposed facing one another, wherein the substrate of each nanocomposite electrode is coated with the mixture on an inside facing surface and the outer surfaces of the nanocomposite electrodes are not coated with the mixture, and the inside facing surfaces are separated by at least one electrolyte.