Zinc-Ion Hybrid Supercapacitor Electrodes for Dendrite-Stable Cycling

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Solution Overview

Problem

Existing zinc ion hybrid supercapacitors (ZIHSCs) face issues with poor cycle stability and inefficient energy storage due to zinc dendrite growth, leading to short circuits and low efficiency.

Innovation Solution

The development of a ZIHSC with a Zn nanosheets electrodeposited metal substrate (Zn ED-MS) anode and a jute activated carbon coated conductive carbon substrate (JAC-CCS) cathode, utilizing an aqueous zinc salt electrolyte, enhances the device's performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If Zn metal anodes are used in ZIHSCs, then the device can achieve high energy density, but zinc dendrites develop due to uneven stripping and plating, leading to poor cycle stability and short circuits

Engineering Contradiction:

Improveenergy densityVSAvoidcycle stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent employs a porous Cu substrate with a three-dimensional network structure as the anode. The porous structure provides uniform Zn deposition sites and prevents dendrite formation by distributing current evenly across the electrode surface. The pore structure also accommodates volume changes during Zn stripping and plating, maintaining structural integrity over multiple cycles while achieving high energy density.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent changes the material parameter from Zn metal to electrodeposited Zn on porous Cu substrate. This parameter change transforms the anode from a dense metal structure to a porous composite structure, which fundamentally alters the deposition behavior of Zn ions and prevents dendrite formation while maintaining high capacity.

Inventive Principle:

Principle #35Parameter changes

2Speed

If capacitor-type carbon cathodes are used in ZIHSCs, then the device achieves quick kinetics, but the specific capacitance remains low

Engineering Contradiction:

ImprovekineticsVSAvoidspecific capacitance

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The patent uses a composite cathode structure combining conductive carbon substrate with pseudocapacitive materials (such as metal oxides or hydroxides). The conductive carbon provides quick kinetics and electrical conductivity, while the pseudocapacitive materials contribute additional charge storage capacity through surface redox reactions, achieving both fast kinetics and high specific capacitance.

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If divalent or trivalent metal ions are used as charge carriers, then the energy density increases, but the requirement for manufacturing precision increases due to uneven ion distribution

Engineering Contradiction:

Improveenergy densityVSAvoidion distribution uniformity

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent applies local quality by creating heterogeneous nucleation sites within the porous Cu substrate structure. The three-dimensional network provides localized regions with different properties that guide uniform Zn ion deposition. This local structural variation ensures even distribution of divalent Zn ions throughout the electrode, preventing concentration gradients and uneven plating while maintaining high energy density.

Inventive Principle:

Principle #3Local quality

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 ZIHSC achieves high specific energy density, power density, and improved cycle stability with a capacity retention rate of 94% after 10,000 cycles, addressing the dendrite-related inefficiencies of previous designs.

Implementation Method 1

Zn nanosheets electrodeposited metal substrate (Zn ED-MS) as an anode

Methodology Applied

Scientific EffectElectrodeposition: Electrodeposition

Implementation Method 2

zinc ion hybrid supercapacitor (ZIHSC) in the form of an electrochemical cell

Methodology Applied

Scientific EffectIon insertion/extraction:

Implementation Method 3

The electrical double-layer storage method produces low specific capacitances yet quick kinetics for the carbon-based electrodes used in ZIHSC cathodes

Methodology Applied

Scientific EffectElectrical double-layer storage: Capacitance

Implementation Method 4

an electrolyte containing an aqueous solution of a Zn salt at a concentration of 0.05 to 5 molars (M)

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 5

Dendrites would develop at the Zn metal due to the uneven stripping and plating. Poor cycle stability and insufficient energy efficiency of ZISHCs may result from Zn dendrite proliferation

Methodology Applied

Scientific EffectDendrite prevention:

Data Source

PatentUS12512276B2Zinc-ion hybrid supercapacitor and methods of preparation thereof

Publication Date: 2025.12.30 KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

AI summary

A zinc (Zn) ion hybrid supercapacitor (ZIHSC) in the form of an electrochemical cell includes a Zn nanosheets electrodeposited metal substrate (Zn ED-MS) as an anode, and a jute activated carbon coated conductive carbon substrate (the JAC-CCS) as a cathode, an electrolyte including an aqueous solution of Zn salt at a concentration of 0.05 to 5 molars (M), and a membrane as a separator.