氧化物的温度敏感结构 离子电池的丰富层氧化物的演变
Haijun Yu1, Yeong-Gi So2, Yang Ren3
1College of Materials Science & Engineering, Key Laboratory of Advanced Functional Materials, Ministry of Education , Beijing University of Technology , Pingleyuan #100 , Chaoyang District, Beijing , 100124 , People's Republic of China.
Journal of the American Chemical Society
|October 24, 2018
概括
在电池循环过程中,丰富的多层氧化物阴极的结构变化取决于温度. 了解这种演变是设计电动汽车更稳定的高能离子电池的关键.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 富含的层状氧化物是高能离子电池的有前途的材料,特别是用于电动汽车.
- 它们的复杂反应机制和在电化学循环过程中的结构稳定性需要进一步研究以实现实际应用.
研究的目的:
- 在电化学循环过程中,在各种温度下彻底研究富含的层状氧化物的结构演变.
- 了解和设计这些正极材料的结构稳定性.
主要方法:
- 在不同温度下电化学循环的富层氧化物.
- 分析结构变化,包括核心外结构形成,氧气提取,金属迁移和表面聚合.
主要成果:
- 观察到结构转化为核心外结构 (扭曲的单临床LiTMO2核心,无序的脊柱/岩盐外).
- 识别了网格氧气提取,密集化,过渡金属迁移和表面聚合.
- 结构转换的显著温度敏感性,在更高的温度下加速.
结论:
- 澄清了在循环过程中富含的多层氧化物的结构演变机制.
- 结构转换高度依赖温度,可以通过材料设计来控制.
- 为设计先进电池的高能阴极材料提供了洞察力.
相关概念视频
03:12Batteries and Fuel Cells
31.0K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
31.0K
02:54Trends in Lattice Energy: Ion Size and Charge
26.7K
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:
26.7K
02:55The Evidence for Evolution
48.2K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
48.2K
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
45.3K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
45.3K
01:54Convergent Evolution
32.9K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
32.9K
03:14Oxidation Numbers
42.6K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
42.6K