Structural zinc-ion supercapacitors (ZIHSCs)
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Solution Overview
Problem
Existing energy storage devices, such as batteries and supercapacitors, face challenges in achieving a balance between mechanical strength and electrochemical performance, particularly in structural applications like electric vehicles and satellites, with low energy densities and poor power densities.
Innovation Solution
Development of zinc-ion hybrid supercapacitors (ZIHSCs) using unidirectional nitrogen-doped highly-porous carbon nanofibers and a polyvinyl alcohol gel electrolyte, which provide a multilayered configuration for enhanced mechanical strength and electrochemical performance, including a metallic zinc anode for load-bearing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If batteries are used for energy storage, then energy capacity is improved, but power density and life-time deteriorate
Solution Approach 1:
The patent combines battery-type faradaic electrode and capacitor-type electrode into a hybrid supercapacitor system, merging the energy storage advantage of batteries with the power density advantage of supercapacitors to achieve both high energy capacity and high power density simultaneously
Solution Approach 2:
The patent uses composite electrode structures combining different material types (faradaic and capacitive materials) to create a hybrid system that exhibits both battery-like energy storage and capacitor-like power delivery characteristics
2Power
If supercapacitors are used for energy storage, then power density is improved, but energy density deteriorates
Solution Approach 1:
The patent merges capacitor-type and battery-type electrodes in a hybrid configuration, allowing the device to achieve high power density from the capacitive component while simultaneously achieving high energy density from the faradaic component
3Strength
If structural energy storage devices are developed, then mechanical strength is improved, but energy density deteriorates
Solution Approach 1:
The patent designs structural energy storage devices where the electrode materials serve dual functions: providing mechanical strength and load-bearing capability while simultaneously delivering high energy density through electrochemical energy storage
Solution Approach 2:
The patent employs composite structural materials that combine mechanical reinforcement with electrochemically active materials, creating a unified structure that provides both structural integrity and high energy density
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 ZIHSCs achieve a battery-level gravimetric energy density of 80.2 Wh/kg, outstanding areal energy density of 600 mF/cm², and excellent mechanical properties, outperforming state-of-the-art structural electrode materials with cycling stability over 7,500 cycles and performance in cryogenic conditions.
Implementation Method 1
a gel electrolyte including polyvinyl alcohol (PVA) therein
Implementation Method 2
unidirectional nitrogen-doped highly-porous carbon nanofibers (N-CNF)
Implementation Method 3
the battery-type electrodes contribute a high energy capacity through ion insertion and extraction reactions
Implementation Method 4
the capacitor-type electrode allows for great power density through the process of rapid ion adsorption and desorption
Data Source
AI summary
In an embodiment, the present disclosure pertains to a supercapacitor composed of a cathode material, a gel electrolyte, and a zinc foil anode. In some embodiments, the cathode material, the gel electrolyte, and the zinc foil anode are in a multilayered configuration. In some embodiments, the cathode and anode materials provide load-bearing capability. In an additional embodiment, the present disclosure pertains to a method of making a supercapacitor. In general, the method includes fabricating a cathode material, preparing a gel electrolyte, coating a zinc foil electrode with the gel electrolyte, and sandwiching the zinc foil electrode with the cathode material. In some embodiments, the sandwiching forms a multilayered configuration composed of the cathode material, the gel electrolyte, and the zinc foil anode. In some embodiments, the cathode and anode materials provide load-bearing capability that can include, without limitation, maximum tensile strength, Young's modulus, toughness, and combinations thereof.