脊柱氧化物框架的设计策略,使可逆Mg-Ion间隙实现可逆
Bob Jin Kwon1, Saul H Lapidus2, John T Vaughey1
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
Accounts of chemical research
|December 19, 2023
概括
研究人员为高能离子电池开发了新的螺旋氧化物材料. 这些材料可实现高效的离子间隔,克服了先前用于先进能量存储的氧化物阴极的限制.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 在金属氧化物中的可逆离子 (Mg2+) 间隙对于高能量密度的Mg-离子电池至关重要.
- 现有的带有软离子的Mg离子电池由于插入潜力低,缺乏与离子电池竞争的能量密度.
- 氧化物中的Mg2+扩散往往受到强大的静电相互作用的阻碍,限制了阴极性能.
研究的目的:
- 设计,合成和评估新型固体溶液氧化物螺旋作为高潜能Mg离子电池阴极.
- 通过定制氧化物框架来减轻缓慢的Mg2+扩散动力学,以适应不太稳定的Mg2+-O2-协调.
- 为了将结构性质和缺陷与电化学性能相关联,以提高能量存储.
主要方法:
- 理论计算和实验数据指导了螺旋氧化物成分的设计.
- 合成固体溶液中含有电化学活性金属 (如Mn) 和结构稳定剂 (如Cr) 的螺旋.
- 现场和现场表征技术 (例如,X射线衍射) 来分析短距离和远距离结构,并与电化学活性相关联.
主要成果:
- 开发了具有易于散装Mg2+离子活性而没有相变的spinel氧化物材料.
- 通过可逆的Mg2+间隔证明了增强的能量储存能力.
- 确定了控制电化学性能的关键变量,从而实现了优化材料设计.
结论:
- 定制氧化物框架,特别是固溶液螺旋,可以克服氧化物阴极中的Mg2+扩散限制.
- 开发的材料对高能量密度的Mg离子电池充满希望,与离子技术相提并论.
- 这项工作为氧化阴极中的阴离子扩散提供了基本的见解,有利于未来的可充电电池开发.
更多相关视频
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.5K
09:49In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
4.1K
相关概念视频
01:17Ion Exchange
594
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...
594
03:02Colors and Magnetism
11.7K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.7K
02:48Ionic Bonding and Electron Transfer
41.6K
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.
41.6K
02:42Valence Bond Theory
8.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.6K
02:42Ionic Crystal Structures
14.4K
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...
14.4K
03:45Formation of Complex Ions
23.7K
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...
23.7K