带结构工程促进无氧化氧化物可逆性,可不含的丰富多层氧化物天道
Xianggang Gao1, Juanlang Guo1, Shihao Li1
1School of Metallurgy and Environment, Hunan Province Key Laboratory of Nonferrous Value-Added Metallurgy, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, Hunan, 410083, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|March 29, 2024
概括
没有Co的丰富的层状氧化物阴极通过Mo/Cl联合剂实现了增强的稳定性和能量密度. 这一策略改善了离子氧化还原可逆性和结构完整性,用于先进的电池应用.
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
- 固态化学 固态化学
背景情况:
- 富含的层氧化物 (LLOs) 由于离子氧化还原作用,对高能量密度电池具有前景.
- 在LLOs中不受控制的阳离子氧化还原会导致结构和电化学降解.
- 开发稳定阴离子氧化还原的策略对于LLO性能至关重要.
研究的目的:
- 调查Mo/Cl联合兴奋剂作为一种方法来调节LLOs中的阳离子氧化还原化学.
- 为了提高无Coe Li1.16Mn0.56Ni0.28O2阴极的结构稳定性和电化学性能.
- 设计LLOs的带结构,以提高能量密度和循环寿命.
主要方法:
- 协同使用的1.16Mn0.56Ni0.28O2阴极与 (Mo) 和 (Cl).
- 通过Mo和Cl的结合来分析带能量间隙调制.
- 评估结构稳定性和电化学性能,包括周期稳定性和速率能力.
主要成果:
- /联合兴奋剂缩小了带能量差距,增强了阳离子氧化还原可逆性.
- 增加Mn-O键的共价性稳定了氧物种和MnO6八面体的扭曲.
- 观察到更好的电子导电性和Li+动力学,从而提高周期稳定性和速率性能.
结论:
- /联合兴奋剂有效调节阳离子氧化还原化学,并增强LLOs的结构稳定性.
- 通过双重兴奋剂的带结构工程为高能量密度LLO设计提供了一种可行的策略.
- 这种方法为开发具有改进电化学性能的先进阴极材料提供了指导.
相关概念视频
Ladder Diagrams: Redox Equilibria
457
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
457
Ionic Bonding and Electron Transfer
41.5K
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.
41.5K
Redox Equilibria: Overview
564
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
564
Balancing Redox Equations
52.1K
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
52.1K
Voltaic/Galvanic Cells
57.2K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
57.2K
Electrolysis
26.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.3K


