Enhancement of Electrochemical Performance by the Oxygen Vacancies in Hematite as Anode Material for Lithium-Ion Batteries

作者：Peiyuan Zeng, Yueying Zhao, Ying‐Wu Lin, Xiaoxiao Wang, Jianwen Li, Wanwan Wang, Zhen Fang · 发表于：Nanoscale Research Letters · 年份：2017 · DOI：10.1186/s11671-016-1783-0 · 被引用次数：48 · 研究领域：Advancements in Battery Materials、Extraction and Separation Processes、Metal Extraction and Bioleaching

The application of hematite in lithium-ion batteries (LIBs) has been severely limited because of its poor cycling stability and rate performance. To solve this problem, hematite nanoparticles with oxygen vacancies have been rationally designed by a facile sol–gel method and a sequential carbon-thermic reduction process. Thanks to the existence of oxygen vacancies, the electrochemical performance of the as-obtained hematite nanoparticles is greatly enhancing. When used as the anode material in LIBs, it can deliver a reversible capacity of 1252 mAh g −1 at 2 C after 400 cycles. Meanwhile, the as-obtained hematite nanoparticles also exhibit excellent rate performance as compared to its counterparts. This method not only provides a new approach for the development of hematite with enhanced electrochemical performance but also sheds new light on the synthesis of other kinds of metal oxides with oxygen vacancies.