Conductive-Coated Zinc Powder Anodes for Dendrite Suppression
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Solution Overview
Problem
Zinc dendrite growth and low zinc utilization rate in zinc foil anodes of aqueous zinc-ion batteries, leading to uncontrollable side reactions and reduced performance.
Innovation Solution
A preparation method involving zinc powder and a conductive material, dispersed in a solvent, followed by ball milling, heating, introduction of supercritical carbon dioxide, and subsequent depressurization, cooling, and drying to form a uniformly coated zinc powder anode material, enhancing electrochemical stability and inhibiting dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If zinc foil is used as anode material, then the battery structure is simple and easy to manufacture, but zinc dendrite growth is uncontrollable and zinc utilization rate is low
Solution Approach 1:
The patent divides the continuous zinc foil into discrete zinc powder particles (0.1-25 μm), creating a segmented anode structure. This segmentation prevents continuous dendrite growth pathways while maintaining manufacturability through standard powder handling and coating processes.
Solution Approach 2:
The patent applies a conductive material coating (5-20 nm thickness) specifically on the surface of zinc powder particles, creating local quality enhancement at the particle surface. This localized coating improves electron conductivity and controls dendrite formation at critical growth sites without requiring complete structural redesign.
2Ease of manufacture
If zinc foil is used as anode material, then the manufacturing process is simple, but zinc utilization rate is low
Solution Approach 1:
By segmenting zinc into fine powder particles (0.1-25 μm), the patent dramatically increases the surface area to volume ratio, exposing more zinc surface for electrochemical reactions. This segmentation enables higher zinc utilization rates while maintaining simple powder-based manufacturing processes.
Solution Approach 2:
The conductive coating applied locally on zinc powder surfaces improves electron transfer efficiency at the particle level, enhancing the electrochemical activity of each zinc particle and thereby increasing overall zinc utilization without complicating the manufacturing process.
3Ease of manufacture
If conventional coating methods are used, then the process is simple, but coating uniformity on zinc powder surface is poor
Solution Approach 1:
The patent utilizes the phase transition of carbon dioxide to supercritical state (above 31°C and 7.38 MPa) for coating zinc powder surfaces. The supercritical CO2 penetrates uniformly into the powder aggregate, enabling homogeneous coating distribution while maintaining relatively simple process conditions and equipment requirements.
Solution Approach 2:
The patent employs supercritical carbon dioxide as an intermediary medium to deliver the conductive material coating uniformly onto zinc powder surfaces. The CO2 acts as a carrier that penetrates the powder structure and facilitates even coating distribution, then evaporates completely, leaving no residue and achieving uniform coating without complex equipment.
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 method results in a zinc powder anode material with improved zinc utilization rate and electrochemical stability, effectively inhibiting dendrite growth and hydrogen evolution, while being cost-effective and practical.
Implementation Method 1
introducing carbon dioxide into the sealed container, stopping introducing carbon dioxide when a pressure in the sealed container reaches a target pressure, and leaving same to stand for preset time, where in this case, carbon dioxide reaches a supercritical state at the target pressure and the target temperature, and by means of a physicochemical action of supercritical carbon dioxide fluid, a surface of the zinc powder is fully infiltrated
Data Source
AI summary
Disclosed are a zinc powder anode material, a preparation method therefor, and a zinc-ion battery, which relate to the technical field of batteries. The preparation method for a zinc powder anode material includes the following steps: providing zinc powder and a conductive material; dispersing zinc powder and a conductive material in a solvent to obtain a mixed solution; performing ball milling of the mixed solution; transferring the ball-milled mixed solution to a sealed container, heating same to a target temperature, stopping heating, introducing carbon dioxide into the sealed container, stopping introducing carbon dioxide when a pressure in the sealed container reaches a target pressure, and leaving same to stand for preset time, where carbon dioxide reaches a supercritical state at the target pressure and the target temperature; and sequentially performing depressurizing, cooling, coating, and drying to obtain a zinc powder anode material.