期刊
NANO ENERGY
卷 67, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.104295
关键词
Potassium-ion batteries; Titanium disulfide; Anode; Cation defects
类别
资金
- NSAF Joint Fund [U1830106]
- National Natural Science Foundation of China [U1632114, 21773060]
- Ningbo S&I Innovation 2025 Major Special Program [2018B10061]
- Young Scholar Project of Long Jiang Scholars Program [Q201818]
- K.C. Wong Magna Fund in Ningbo University
In recent years, potassium-ion batteries have been extensively studied as an alternative for lithium ion batteries, thus developing electrode materials for them has become important. TiS2 as a typical electrode material is chosen due to the unique layered structure. However, 1T-TiS2 (tetragonal (T)) is a metastable metallic phase, leading to poor long-term stability for alkali metal ions batteries. In order to alleviate this shortcoming, the functional cation defects are generated on the surface of TiS2 via thermal annealing method in this work. Introduced titanium vacancies effectively improve cycle ability and enhance kinetic performance. The microscopic stress and strain can be weakened due to the existence of defects, demonstrating that defects can alleviate volume expansion during the ion intercalation process to maintain structural stability, thus obtaining excellent cycle ability. Meanwhile, titanium vacancies also can regulate alkali metal ions insertion sites to stabilize crystal structure. In addition, titanium vacancies could be conducive to the improvement of kinetics, including charge-transfer resistance and ions transport. These features are verified by electrochemical analysis combined with density functional theory calculations. Therefore, functional cation defects engineering as a facile and effective strategy can be advanced in various energy storage applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据