晶体间裂对多晶层氧化物阴极快速充电和加速降解的作用
Jinhong Min1, Tobias Glossmann2, Yiyang Li1
1Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan, 48109, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 29, 2025
概括
离子电池阴极如NMC和NCA中的裂可以降低性能,但也可以通过允许电解质透来增强反应动力学. 了解这种双重作用是未来电池设计的关键.
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:
- 多晶层氧化物阴极,包括,,和氧化物 (NMC) 和,和氧化物 (NCA),对于离子电池至关重要.
- 在离子循环过程中发生的异型体积变化会导致这些阴极颗粒的粒际裂纹.
研究的目的:
- 提供关于多晶阴极材料裂的双重作用的视角.
- 要突出裂对电化学性能和反应动力学的影响.
主要方法:
- 审查最近关于裂形成及其影响的研究.
- 分析粒子微观结构,裂变和电化学性能之间的相互作用.
主要成果:
- 裂通常会导致阴极材料的性能降低和故障.
- 在分层氧化物中,裂可以通过促进电解质透,减少扩散长度和增加反应表面积来提高电化学性能.
结论:
- 在NMC和NCA阴极中的裂具有双重性质,对性能有害和有益.
- 承认裂和电解质透的复杂作用对于优化用于储能的阴极材料至关重要.
相关概念视频
01:30The Electrical Double Layer
241
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
241
01:26Imperfections in Crystal Structure: Stoichiometric Point Defects
143
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
143