用于极端条件的离子电池的溶剂介导的可逆的第三级石墨间隔化合物
Lei Tao1, Dawei Xia1, Poom Sittisomwong2
1Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.
Journal of the American Chemical Society
|June 7, 2024
概括
一个新的石墨阳极机制可以在离子电池 (LIB) 中实现超快充电和稳定的低温性能. 这种方法促进了快速的动力学,克服了用于先进能量储存的传统间隔化学的局限性.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 传统的离子电池阳极依赖于特定的间接机制.
- 现有的三元石墨间隔化合物 (t-GICs) 使用甘氨酸溶剂显示循环能力较差.
- 在LIB中,反合机制通常需要完全的离子解离,从而限制性能.
研究的目的:
- 为石墨阳极引入一种新的t-GIC在四水 (THF) 中的现场合成方法.
- 调查一种与传统的互插不同的新互插机制.
- 提高电池性能,专注于快速充电和低温操作.
主要方法:
- 进行同步X射线分析以描述现场t-GIC形成.
- 电化学分析以量化转化和性能.
- 使用分层阴极制造和测试全细胞.
主要成果:
- 从二进制GIC (b-GIC) 和THF中证明自发的,可在现场控制的t-GIC形成.
- 实现了快速的动力学和同步的充/放电,不需要完全的离子溶解.
- 显示1分钟快速充电,无树低温性能,以及超过10,000次的石墨阳极.
- 充满电池显示稳定的循环充电时间为15分钟,在-40°C下表现出色.
结论:
- 这种新型的间隔机制显著提高了LIB的石墨阳极化学性能.
- 这种可适应的方法使低成本,高性能快充和低温电池成为可能.
- 化学策略不仅适用于离子和离子电池.
相关概念视频
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
03:12Batteries and Fuel Cells
27.3K
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...
27.3K