深入了解O3型NaLi1/3Mn2/3O2中介层迁移的情况,作为Na-ion电池的阴极材料
Wenjing Qin1, Mei Li1, Baozhen Sun1
1Laboratory of Computational Materials Physics, Department of Physics, Institute of Condensed Matter, Jiangxi Normal University, Nanchang 330022, China.
The Journal of chemical physics
|July 1, 2024
概括
(Li) 兴奋剂提高了氧化 (NaMnO2) 电池的性能,但的迁移会影响电池的稳定性. 这项研究揭示了促进或阻碍O3型NaLi1/3Mn2/3O2 (NLMO) 中Li迁移的因素,以改善电池设计.
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
- 计算化学的计算化学
背景情况:
- 像NaMnO2这样的多层过渡金属氧化物为储能提供低成本和高容量.
- 然而,NaMnO2由于复杂的相位过渡而遭受不良循环稳定性.
- 在NaMnO2中 (Li) 兴奋剂,特别是O3型NaLi1 / 3Mn2 / 3O2 (NLMO),提高了电化学性能,但引入了不可逆转的Li层间迁移.
研究的目的:
- 阐明电池循环期间O3型NaLi1/3Mn2/3O2 (NLMO) 中层间迁移的机制.
- 解和分析各种因素 (层间距,Na-离子度,O-离子氧化,相变) 对Li迁移的影响.
- 确定调节Li迁移和提高电池性能的关键因素.
主要方法:
- 利用第一原理计算来模拟和分析层间迁移.
- 研究了个别因素的影响,包括层间间距,离子度,O离子氧化程度和相位过渡.
- 分离合变量以隔离每个因素对Li迁移的影响.
主要成果:
- 发现离子度降低和离子氧化度增加促进层间迁移.
- 确定了O-P阶段过渡是抑制层间迁移的因素.
- 层间间距对Li层间迁移过程的影响较小.
结论:
- 了解影响层间迁移的因素对于优化NLMO阴极材料至关重要.
- 针对Na-离子度和O-离子氧化状态的策略可以用来控制Li的迁移.
- 这项研究为设计更稳定,更高性能的离子电池层氧化物阴极提供了洞察力.
相关概念视频
00:42Ionic Bonds
118.2K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.2K
02:48Ionic Bonding and Electron Transfer
41.4K
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.
41.4K
01:17Ion Exchange
574
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
574