Zinc Anode Battery Boron Nitride Coated Particles
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Solution Overview
Problem
Zinc batteries face challenges in handling and dispersing zinc particles due to their tendency to stick together, leading to poor flow and difficulty in mixing and filling the battery casing, which requires improving lubricity without affecting battery performance.
Innovation Solution
Applying a thin boron-containing film, typically up to 10 nm thick, onto zinc metal or alloy particles using an atomic layer deposition process involving triethylboron and ammonia, which enhances lubricity without interfering with the battery's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If zinc particles are used as anode material, then battery performance is maintained, but particles stick together causing poor flow and handling difficulties
Solution Approach 1:
A boron-containing film is applied as an intermediary coating layer on the zinc particle surface. This film acts as a mediator that prevents direct contact and adhesion between zinc particles, improving flow properties while maintaining electrochemical performance through controlled thickness (up to 10 nm) and composition.
Solution Approach 2:
The physical and chemical parameters of the zinc particle surface are changed by depositing a boron-containing film. This modifies surface properties such as lubricity and wettability, transforming the particles from sticky to free-flowing while controlling film thickness and composition to preserve electrochemical activity.
2Ease of operation
If a coating is applied to improve lubricity, then flow properties improve, but coating thickness may interfere with battery performance
Solution Approach 1:
A thin boron-containing film (up to 10 nm) is deposited on the zinc particles to provide lubricity improvement. The film thickness is carefully controlled to be sufficient for reducing particle adhesion and improving flow, yet thin enough to allow electrochemical reactions to proceed effectively at the zinc surface.
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 boron-containing coating significantly improves the flow properties of zinc particles, facilitating the manufacturing process and ensuring better dispersion in electrolytes, thereby simplifying the mixing and filling steps in battery production.
Implementation Method 1
exposing the zinc metal or zinc alloy particles to triethylboron in the vapor phase at a temperature of no greater from 100 to 600° C. such that the boron atom of the triethylboron forms a bond to the surface of the zinc metal or zinc alloy particles
Implementation Method 2
performing one or more atomic layer deposition reaction cycles in the presence of the zinc metal or zinc alloy particles, wherein in each atomic layer deposition cycle the zinc metal or zinc alloy particles are exposed alternatively and sequentially to vapor phase triethylboron and vapor phase ammonia
Data Source
AI summary
Triethylboron is a useful precursor for depositing films in an atomic layer deposition process. This precursor is useful for depositing boron containing films. Boron containing films are excellent lubricating coatings for zinc powders, improving their flow properties and simplifying powder handling. This makes the coated zinc powders especially useful for battery applications in which a zinc powder is used as an anode material.