シングルイオンリ+,Na+,およびMg2+の固体電解質は,メソポラスアニオン基亜塩酸金属有機枠で支えられている
Sarah S Park1, Yuri Tulchinsky1, Mircea Dincă1
1Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|September 8, 2017
まとめ
この研究は,固体電解質の記録イオン負荷を可能にする,可逆的な相移行を可能にする新しい金属有機フレームワーク (MOF) を導入します. これらのMOFは高いイオン伝導性を示し バッテリー技術を進めている.
科学分野:
- 材料科学
- 無機化学
- 電気化学
背景:
- メタル・オーガニック・フレームワーク (MOF) は,様々な用途のために調節可能な多孔構造を提供します.
- 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
- 既存のMOFベースの電解質は,イオン伝導性と負荷能力の課題に直面しています.
研究 の 目的:
- 管状の毛穴を持つ新しいCu (II) -アゾラートMOFを合成し,特徴づけること.
- MOFの単結晶から単結晶への移行を調査する.
- Li+,Na+,Mg2+イオンのための高性能固体電解質としてのMOFの可能性を調査する.
主な方法:
- 単一結晶のX線微分法で 構造的変異を研究する
- アニオン交換のためのハリド/偽ハリド塩とのステキオメトリック反応.
- Li+,Na+,Mg2+塩でイオンに負荷されている.
- イオン伝導性を測定するための電気化学阻力スペクトロスコーピー.
主要な成果:
- リバーシブルな相移行を示す新しいCu (II) -アゾラートMOFが成功して合成されました.
- MOFはリチウム+,ナ+およびMg2+イオンの記録的な量のステキオメトリック負荷を示した.
- シングルイオン伝導性は,1D孔内の静止アニオンと移動カチオンにより達成された.
- 達成されたイオン伝導度:4.4 × 10^-5 S/cm (Li+),1.8 × 10^-5 S/cm (Na+),8.8 × 10^-7 S/cm (Mg2+).
- LiBF4を加えると,Li+伝導性が4.8 × 10^-4 S/cmに増加した.
結論:
- 新しいMOFは,高性能固体電解質の開発のための効率的なプラットフォームとして機能します.
- リバーシブル・フェーズ・トランジション・メカニズムは,高いイオン負荷能力を促進する.
- 観測されたイオン伝導性は,これまでMOF固体電解質で報告された最高値を表しています.
- この研究は,MOFベースの先進的なエネルギー貯蔵アプリケーションへの道を切り開きます.
さらに関連する動画
関連する概念動画
Ionic Crystal Structures
18.6K
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...
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...
18.6K
Ionic Bonding and Electron Transfer
51.2K
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.
51.2K
Metal-Ligand Bonds
24.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.6K
Ion Exchange
1.4K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.4K
Extraction: Advanced Methods
1.2K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.2K
Formation of Complex Ions
26.4K
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...
26.4K


