对离子电池的阳极材料粒子大小的影响进行基准测试
Feng Wu1,2, Yu Dong1, Yuefeng Su1,2
1Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 21, 2023
概括
离子电池的阳极表现出尺寸依赖的故障机制. 较小的颗粒表现出不同的组成和机械行为,影响电池性能和寿命.
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
- 电池技术 电池技术
背景情况:
- 阳极由于其高容量,对高能离子电池来说是有希望的.
- 然而,阳极遭受体积膨胀,粉碎和固体电解质间相 (SEI) 增长,导致快速故障.
- 粒子大小对这些故障机制的影响仍然不清楚.
研究的目的:
- 研究颗粒大小 (50纳米至5微米) 对电化学性能和故障机制的影响.
- 为了将组成,结构,形态和表面化学的演变与电池故障相关联.
- 为阳极量身定制的修改策略提供见解.
主要方法:
- 利用了多种基于物理,化学和同步电子的表征.
- 在循环过程中,在各种粒子大小 (50 nm 到 5 μm) 的范围内进行基准阳极.
- 分析了组成,结构,形态和表面化学的变化.
主要成果:
- 纳米和微阳极在循环过程中表现出类似的相位过渡,但不同的组成变化.
- 机械化学行为,包括电极裂变和颗粒粉碎,与颗粒大小有显著差异.
- 与纳米样本相比,微样本显示较薄的SEI层和不同的SEI组成.
结论:
- 粒子大小极大地影响了离子电池中的电化学失效机制.
- 了解这些依赖大小的演变对于开发有效的阳极修改策略至关重要.
- 需要针对纳米与微尺度阳极量身定制的方法来提高电池寿命.
相关概念视频
02:54Trends in Lattice Energy: Ion Size and Charge
24.0K
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:
24.0K
01:16Precipitate Formation and Particle Size Control
820
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
820