結晶リチウムイミダゾラート 高リチウムイオン伝導性の共性有機フレームワーク
Yiming Hu1, Nathan Dunlap2, Shun Wan3
1Department of Chemistry , University of Colorado , Boulder , Colorado 80309 , United States.
Journal of the American Chemical Society
|April 16, 2019
まとめ
研究者らは,固体電解質のための新しいイオン共性有機フレームワーク (ICOF) を開発した. これらのICOFは高いリチウムイオン伝導性と低い活性化エネルギーを示し,先進的な固体電池の道を開く.
科学分野:
- 材料科学
- 電気化学
- ポリマー化学
背景:
- イオン共性有機フレームワーク (ICOF) は,固体電解質のための先進的な材料として登場しています.
- 効率的な固体電解質の開発は 次世代のエネルギー貯蔵装置にとって不可欠です
研究 の 目的:
- シングルイオン導電性固体電解質材料として結晶イミダゾラートを含むICOFの最初のシリーズを報告する.
- これらのICOFのイオン伝導性を影響する構造-特性関係を調査する.
主な方法:
- 結晶のイミダゾラートを含むICOFの合成
- ICOF構造と多孔性のフレームワークの特徴
- リチウムイオン輸送のためのイオン伝導性と活性化エネルギーの測定.
主要な成果:
- 高いイオン伝導度 (7.2 × 10−3 S cm−1) と低い活性化エネルギー (0.10 eV) を達成した.
- 弱いリチウムイオン-イミダゾラート結合とよく定義された多孔構造がイオン輸送を促進することを実証した.
- イオン対の相互作用を弱めることで,電子を取り除く置換剤がイオン伝導性を大幅に改善することを発見した.
結論:
- イミダゾラートを含むICOFは,高効率の単離導体固体電解質の新種である.
- これらのICOFは,完全に固体電解装置のための材料の開発に有望なボトムアップアプローチを提供します.
- 代替物質の電子特性を調整することは,ICOFにおけるイオン伝導性を最適化するための効果的な戦略です.
関連する概念動画
02:18Network Covalent Solids
16.1K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
16.1K
01:29Covalent Bonds
160.9K
Overview
160.9K
01:08Covalent Bonds
10.2K
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
10.2K
02:46Covalent Bonding and Lewis Structures
61.0K
Compared to ionic bonds, which results from the transfer of electrons between metallic and nonmetallic atoms, covalent bonds result from the mutual attraction of atoms for a “shared” pair of electrons.
61.0K
02:04Covalently Linked Protein Regulators
8.9K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
8.9K
02:54Trends in Lattice Energy: Ion Size and Charge
26.6K
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:
26.6K