在伪球结构的LiNi0.5Mn1.5O4中,地质调节的有序相,旋有效地抑制了Mn溶解
Weixi Tian1, Weihao Zeng1, Tingting Wang1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Inorganic chemistry
|July 20, 2023
概括
兴奋剂通过稳定LiNi0.5Mn1.5O4 (LNMO) 旋转阴极来提高离子电池的性能. 这一策略抑制过渡金属溶解,改善结构完整性和循环寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (LIB) 依赖于像LiNi0.5Mn1.5O4 (LNMO) 这样的正极材料,以获得高能量密度和稳定性.
- 由于接口反应和散装退化,LNMO面临着挑战,导致产能减弱.
- 抑制过渡金属溶解对于改善LNMO阴极寿命至关重要.
研究的目的:
- 为了研究 (Ge) 兴奋剂对LNMO有序/无序相比的影响.
- 为了提高LNMO阴极的结构稳定性和电化学性能.
- 探索地质兴奋剂作为一种抑制过渡金属溶解在LIBs中的战略.
主要方法:
- 地质兴奋剂被用来修改LNMO的螺旋结构.
- 进行了电化学循环测试,以评估容量保留和电压稳定性.
- 结构分析的重点是有序/无序相比率及其对稳定性的影响.
主要成果:
- 地质兴奋剂有效地调整了LNMO的有序/无序相比,提高了结构稳定性.
- 化LNMO阴极表现出异常的循环性能,在1C的1000个循环中保持92.2%的容量.
- 在修改后的阴极中观察到最小的电压下降和抑制的过渡金属溶解.
结论:
- 地质兴奋剂提供了一个强大的策略,以提高LNMO阴极的稳定性和性能.
- 这种方法有效地增加了Mn4+含量,并阻止了过渡金属离子扩散.
- 通过兴奋剂的有序/无序相调节为设计先进的高稳定性阴极材料提供了一条途径.
更多相关视频
10:45Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
Published on: February 5, 2022
4.3K
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
Published on: April 12, 2019
7.7K
相关概念视频
03:45Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
03:02Colors and Magnetism
11.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.9K