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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

16.6K
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...
16.6K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

26.3K
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:
26.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.7K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
19.7K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

48.3K
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. 
48.3K
Metallic Solids02:37

Metallic Solids

20.3K
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....
20.3K
Formation of Complex Ions03:45

Formation of Complex Ions

25.5K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
25.5K

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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全固体電池用ハリド固体電解質

Jianwen Liang1, Xiaona Li1, Shuo Wang2

  • 1Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario N6A 3K7, Canada.

Journal of the American Chemical Society
|March 28, 2020
PubMed
まとめ
この要約は機械生成です。

研究者は,全固体リチウム電池 (ASSLB) のための新しいハライド固体電解質 (SSEs) を開発した. これらのLiScCl3+材料は高いイオン伝導性と安定性を示し,バッテリーの性能を向上させます.

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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科学分野:

  • 材料科学
  • 電気化学
  • 固体化学

背景:

  • 高エネルギー密度全固体リチウム電池 (ASSLB) には,高伝導性と安定した固体電解質 (SSEs) が必要です.
  • ハライド製のSSEはASSLBの発展に有望な機会を提供します.

研究 の 目的:

  • 新しい一連のLiScCl3+SSEを発見し,特徴づけること.
  • 構成,構造,およびLi+輸送特性との関係を調査する.
  • これらのSSEの電気化学性能をASSLBで評価する.

主な方法:

  • コメルトリング合成戦略
  • 構造分析と好ましい方向の観察
  • Li+の拡散性とイオン伝導性の体系的な探査.
  • 電気化学的な窓の測定とリチウム塗装/剥離試験
  • LiCoO2/Li3ScCl6の製造と試験について

主要な成果:

  • LiScCl3+ SSEs (x = 2.5, 3, 3.5, 4) が発見され,室温のイオン伝導性は3 × 10-3 S cm-1までであった.
  • "x"値の調整により調整可能なLi+の移行が示され,導電性が向上し,ブロック効果が低下する.
  • Li3ScCl6は,広範囲の電気化学窓 (0.9-4.3 V 対 Li+/Li) を表しており,2500時間以上安定したLiプレッティング/ストリッピングを行っています.
  • Li3ScCl6を使用したASSLBは,良好なサイクル寿命で104.5 mAh g-1の可逆容量を達成した.

結論:

  • LiScCl3+SSEは,高いイオン伝導性と電気化学的安定性があるため,ASSLBの有効な候補である.
  • LiScCl3+の組成チューニングにより,Li+の輸送を最適化することができます.
  • これらの発見は,高性能ASSLBのための高度なSSEを設計するための新しい戦略を提供します.