レイヤード (Li-Ag) CrS2における高速リチウムイオン伝導度
Jing Peng1, Yuhua Liu1, Yu Pan1,2
1Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science & Technology of China, Hefei 230026, P. R. China.
Journal of the American Chemical Society
|September 9, 2020
まとめ
銀イオンによる"柱効果"を用いて 新しい2Dの高速リチウムイオン導体を開発しました この構造は,高度なエネルギー貯蔵装置に不可欠な高いイオン伝導性を達成します.
科学分野:
- 材料科学
- 固体化学
- 電気化学
背景:
- 高性能の充電可能なエネルギー貯蔵には不可欠です.
- 安全で熱的に安定した固体電解質の開発は依然として課題です.
- 二次元 (2D) 材料はイオン輸送の強化の可能性を提供します.
研究 の 目的:
- 新しいコンセプトを導入するために,
- 柱の効果
- 2Dの高速リチウムイオン (Li+) 導体を設計する.
- 層状のLiAg1-CrS2 (0 < x < 0.4) の構造とイオン輸送特性を調査する.
- エネルギー貯蔵の応用におけるこの新しい材料システムの可能性を調査する.
主な方法:
- 異なる銀含有量 (x) の層状のLiAg1-CrS2材料の合成
- 層構造と柱としてのAg+の役割を確認するための構造的特徴.
- イオン伝導率と活性化エネルギーを測定するための電気化学阻力スペクトル.
- イオン移動メカニズムを分析するための温度依存伝導度測定.
主要な成果:
- 開発されたLiAg1-CrS2構造は,イオンチャネルを固める柱としてAg+を効果的に利用しています.
- この柱状構造は,マルチイオンの協調移動を容易にし,低活性化エネルギーと高速のLi+拡散につながります.
- x = 0.31で最大19.6 mS·cm-1の室温イオン伝導性が達成された.
- Li+とAg+の競合する移動に起因する異常な逆温度依存性が観察されました.
結論:
- その
- 柱の効果
- このコンセプトにより,2Dの高速なLi+導体を作ることが可能になった.
- LiAg1-CrS2システムは,エネルギー貯蔵のための競争力のあるイオン伝導性を実証しています.
- この研究は,ピラー効果に基づいた先進的な固体電解質の設計に新しい道を開きます.
関連する概念動画
02:42Ionic Crystal Structures
16.4K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.4K
02:37Metallic Solids
20.2K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.2K
02:48Ionic Bonding and Electron Transfer
48.0K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
48.0K
02:54Trends in Lattice Energy: Ion Size and Charge
26.2K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
26.2K