协价有机框架纤维构造的人工固体电解质间相层:促进了Li+和封装的Li状石的均沉积
Xiaoyun Fan1, Yantao Zhang1, Yaying Dou2,3
1College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
ACS applied materials & interfaces
|October 25, 2023
概括
在金属阳极上使用新的纤维共价有机框架 (Fib-COF) 涂层,可以防止树的生长,并提高电池的性能. 这种强大的人工固体电解质间相 (SEI) 增强了下一代电池的循环稳定性和库伦比效率.
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:
- 金属阳极具有很高的理论容量,但由于树形成和不稳定的固体电解质介相 (SEI),限制了它们的实际应用.
- 现有的SEI层通常很脆弱,导致沉积不均,容量衰减和金属电池的短路问题.
研究的目的:
- 使用纤维共价有机框架 (Fib-COF) 开发一种强大的人工SEI膜用于金属阳极.
- 研究Fib-COF涂层对沉积,树抑制和电池整体性能的影响.
主要方法:
- 用纤维共价有机框架 (Fib-COF) 涂覆金属表面,以创建一个人工的SEI层.
- 使用现场光学显微镜来动态观察相间形成和树生长.
- 进行电化学性能测试,包括循环稳定性,库伦比效率和全细胞性能评估.
主要成果:
- 这种Fib-COF涂层有效地抑制了树的透,并防止了电池短路.
- 用Fib-COF装饰的阳极在以太基和碳酸盐基电解质中显著提高了库伦比效率和延长了循环稳定性.
- 使用Fib-COF@Li阳极的全电池表现出高的特定容量,例如,在数百个循环后,Li-S的650 mAh g-1和LiFePO4的120 mAh g-1.
结论:
- 由Fib-COF组成的强大的人工SEI膜是实现稳定和高性能金属阳极的有希望的策略.
- 在Fib-COF中的碳基促进了均的Li+转移和核化,有助于无树的沉积.
- 这种方法显著提高了金属电池的循环寿命和可靠性,用于各种应用.
相关概念视频
02:48Ionic Bonding and Electron Transfer
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.
02:42Ionic Crystal Structures
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...
02:18Network Covalent Solids
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...