液体合金Na-Kアノドのカトド依存性
Leigang Xue1, Hongcai Gao1, Yutao Li1
1Materials Science and Engineering Program and Texas Materials Institute , The University of Texas at Austin , Austin , Texas 78712 , United States.
Journal of the American Chemical Society
|February 13, 2018
まとめ
新しいナトリウム・カリウム合金 (Na-K) は,室温でナトリウムとカリウムの両方の充電電極として機能し,カトド材料に基づいてその振る舞いを適応させます.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- アルカリ金属アノードはエネルギー密度が高いが,デンドライト形成に問題がある.
- 現在のナトリウム硫黄 (Na-S) バッテリー技術は,高い動作温度 (>300 °C) を要求する.
- 次世代のバッテリーには 室温でデンドライトのないアルカリ金属アノードの開発が不可欠です
研究 の 目的:
- 室温でデンドライトのないアノドとして,低コストの液体ナトリウム・カリウム (Na-K) 合金を使用する可能性を調査する.
- Na-K合金アノドの電気化学的振る舞いを,異なるカトドホストの好みに関連して決定する.
- ナトリウムとカリウムの両方の充電電池のための二重目的のアノドとしてのNa-K合金の可能性を探求する.
主な方法:
- 室温 (25 °C) で液体Na-K合金を使用して電気化学的塗装と剥離実験を行った.
- 液体Na-K合金 (9.2から58.2重%のナトリウム) の構成範囲が特定されました.
- 選択的なイオン親和性 (Na+ vs. K+) を有するキャソード宿主物質をアノドの振る舞いに用いた.
主要な成果:
- 液体Na-K合金は,室温で液体範囲内でデンドライトフリーで塗装され,剥がれることができます.
- この合金には二重アノドの性質があり,カトドがNa+イオンを選択的に受容すると,ナトリウムアノドとして機能する.
- カリウムアノドとして作用し,ナ+イオンよりもK+イオンを好む.
結論:
- 液体Na-K合金は,カソッド選択に基づいてナトリウムまたはカリウムアノドとして動作する,適応性のあるアノド性能を示しています.
- このユニークな特性により,デンドライトのないナトリウム金属電池と,単一の低コストの液体合金アノドを使用したナトリウム金属電池の開発が可能です.
- この発見は,環境温度で動作する,より安全で効率的なアルカリ金属電池技術への道を開きます.
関連する概念動画
Batteries and Fuel Cells
31.1K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
31.1K
Corrosion
28.6K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
28.6K
Frequency-dependent Selection
24.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.2K
Drug Dependence
1.8K
Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...
1.8K
Contact-dependent Signaling
47.7K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
47.7K
Temperature Dependence on Reaction Rate
89.3K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
89.3K


