晶体结构调制使快速充电和稳定的分层氧化阴极成为可能.
Jingping Lin1, Daoyuan Chen1, Zhimin Lin1
1College of Chemical Engineering, Fuzhou University, Fuzhou 350116, China. zyanyan@fzu.edu.cn.
Nanoscale
|March 26, 2025
概括
在分层氧化物阴极中替代可以提高离子电池的性能. 这种修改提高了循环稳定性和高速率能力,这对于下一代储能应用至关重要.
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:
- 多层氧化物阴极提供成本效益高,高容量的能量存储.
- 挑战包括由于相位转换和离子扩散障碍导致的容量衰减和缓慢的动力学.
研究的目的:
- 为了提高分层氧化物阴极的电化学性能.
- 研究Al3+替代对晶体结构和Na+扩散的影响.
主要方法:
- 在分层氧化物阴极中,通过Fe3+位点替换为Al3+进行晶体结构调节.
- 电化学测试,包括高速循环和容量保留分析.
主要成果:
- Al3+的替代增强了过渡金属层和扩大了Na+扩散通路.
- 修改后的阴极显示出更好的高速性能 (111mAhg-1在5.0C) 和循环稳定性 (73.88%在500个循环后保持).
- 裸阴极表现出较低的性能 (97.3mAhg-1在5.0C,48.42%的保留).
结论:
- 替代Al3+有效地抑制有害的相位过渡,并改善电化学动力学.
- 通过离子替代调整晶体结构是设计稳定和快速充电的O3型阴极的可行策略.
相关概念视频
Ionic Crystal Structures
14.0K
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...
14.0K
Crystal Field Theory - Octahedral Complexes
25.9K
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...
25.9K
Ionic Bonding and Electron Transfer
40.1K
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.
40.1K


