双重兰化物协同提高了螺旋LiMn2O4阴极的稳定性和动力学
Zhushun Zhang1, Jun Du2, Tenghao Li3
1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, China.
Communications chemistry
|January 8, 2026
概括
在氧化 (LMO) 阴极中使用双兰化物兴奋剂增强了稳定性和离子扩散. 这一策略克服了单次兴奋剂的局限性,提高了电池性能和寿命.
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
- 无机化学 无机化学 有机化学
背景情况:
- 在螺旋中部位化 LiMn2O4 (LMO) 旨在减少 Jahn-Teller 扭曲.
- 现有的兴奋剂策略面临着权衡:低价值兴奋剂会削弱氧键,而高价值兴奋剂会增加Mn3+含量.
研究的目的:
- 在LMO中克服单一兴奋剂的局限性,通过提出双兰他尼德 (La3+/Ce3+) 联合兴奋剂.
- 调查La和Ce联合兴奋剂对LMO阴极性能的影响.
主要方法:
- 使用Sol-gel合成制备LiLa0.1Ce0.1Mn1.8O4 (LLCMO) 的方法.
- 进行了电化学表征,以评估电池性能,包括容量,循环稳定性和离子扩散.
主要成果:
- 由于La兴奋剂,LLCMO表现出抑制的格子扭曲,含有减少的Mn3+含量 (43.13%).
- Ce doping (混合Ce3+/Ce4+) 增强了电荷移位和导电性.
- 与原始LMO相比,LLCMO的Li+扩散系数增加了3.2倍.
- LLCMO阴极在0.5°C下提供111.2 mAh g-1,在100次循环后保持90.9%,在10°C下1000次循环后提供76.0 mAh g-1.
结论:
- 拉和Ce的双兰他尼德联合剂提供了一种协同方法来增强LMO阴极稳定性和动力学.
- 这一策略有效地减轻了Mn溶解,并稳定了螺旋框架.
- 这些发现建立了一个可通用的设计原则,通过协同兴奋剂来改进各种阴极材料.
相关概念视频
03:02Colors and Magnetism
13.9K
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...
13.9K
01:09Complexation Equilibria: Factors Influencing Stability of Complexes
786
In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
786
02:51Metal-Ligand Bonds
23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
03:45Formation of Complex Ions
25.6K
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...
25.6K
02:48Ionic Bonding and Electron Transfer
48.6K
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.
48.6K