Zeng Peiyuan, Zhao Yueying, Lin Yingwu, Wang Xiaoxiao, Li Jianwen, Wang Wanwan, Fang Zhen
Key Laboratory of Functional Molecular Solids, Ministry of Education, Center for Nano Science and Technology, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, People's Republic of China.
School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.
Nanoscale Res Lett. 2017 Dec;12(1):13. doi: 10.1186/s11671-016-1783-0. Epub 2017 Jan 5.
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 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.
由于其较差的循环稳定性和倍率性能，赤铁矿在锂离子电池（LIBs）中的应用受到严重限制。为了解决这个问题，通过简便的溶胶-凝胶法和连续的碳热还原工艺合理设计了具有氧空位的赤铁矿纳米颗粒。由于氧空位的存在，所制备的赤铁矿纳米颗粒的电化学性能得到了极大的提高。当用作LIBs的负极材料时，在400次循环后，它在2C下可提供1252 mAh g的可逆容量。同时，与同类材料相比，所制备的赤铁矿纳米颗粒也表现出优异的倍率性能。该方法不仅为开发具有增强电化学性能的赤铁矿提供了一种新途径，也为合成其他具有氧空位的金属氧化物提供了新的思路。
