Mgイオン電池電極:Mgイオン挿入に圧縮された有機固体のヘリングボーン構造
Ismael A Rodríguez-Pérez1, Yifei Yuan, Clement Bommier1
1Department of Chemistry, Oregon State University , Corvallis, Oregon 97331-4003, United States.
Journal of the American Chemical Society
|August 22, 2017
まとめ
結晶有機3,4,9,10-ペリレンテトラカルボキシルダイアンヒドリド (PTCDA) は,水中の電解質にマグネシウム (Mg2+) とカルシウム (Ca2+) のような二価イオンを効率的に貯蔵し,ユニークな構造変化と安定した性能を示す.
科学分野:
- 材料科学
- 電気化学
- オーガニック電子
背景:
- 有機固体はエネルギー貯蔵の 可能性を秘めています
- 二重金属イオンは,電極材料へのインターケレーションに挑戦します.
研究 の 目的:
- 二価金属イオン (Mg2+,Ca2+) を結晶の3,4,9,10-ペリレンテトラカーボキシルダイアンヒドリド (PTCDA) で貯蔵することを調査する.
- イオンホスティング中のPTCDAの構造的および電気化学的振る舞いを理解する.
主な方法:
- 実験技術:XRD (X-ray diffraction) とTEM (トランスミッション電子顕微鏡)
- 理論的調査:第一原理の計算
- 電気化学試験:サイクルボルトメトリー,ガルバノスタティック充電-放電サイクル.
主要な成果:
- PTCDAは,水中の電解質にMg2+とCa2+を効果的に宿している.
- Mg2+インターケレーションは,PTCDA構造にユニークなアニゾトロプ的圧縮変形を引き起こします.
- PTCDA Mgイオン電極は125 mA hg-1の可逆容量,良好な速度能力,安定したサイクルを示しています.
- PTCDAにおけるCa2+貯蔵は80 mA hg-1を超える可逆容量を生成する.
結論:
- PTCDAのヴァン・デル・ワールズ構造は,電荷密度の高い二価イオンを収容するのに適しています.
- イオンによる構造変化を理解することは,高性能の有機電極の設計に不可欠です.
- PTCDAは水性二価イオン電池のカトド材料として有望であることを示しています.
さらに関連する動画
関連する概念動画
Ionic Crystal Structures
18.7K
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...
18.7K
Ionic Bonding and Electron Transfer
51.3K
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.
51.3K
Metallic Solids
21.1K
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....
21.1K
Trends in Lattice Energy: Ion Size and Charge
26.9K
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:
26.9K
Batteries and Fuel Cells
31.3K
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...
31.3K
Crystal Field Theory - Octahedral Complexes
31.2K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.2K


