Design and synthesis of yolk–shell Fe2O3/N-doped carbon nanospindles with rich oxygen vacancies for robust lithium storage
Literature Information
Jianping Lin, Lingfang Ruan, Jiasheng Wu, Wenyu Yang, Xiaohui Huang, Zhiqiang Huang, Shaoming Ying
Ferric oxide (Fe2O3) is an attractive anode material for lithium-ion batteries (LIBs) with a high theoretical capacity of 1005 mA h g−1. However, its practical application is greatly restrained by the rapid capacity fading caused by the large volume expansion upon lithiation. To address this issue, we have designed and synthesized a unique yolk–shell Fe2O3/N-doped carbon hybrid structure (YS-Fe2O3@NC) with rich oxygen vacancies for robust lithium storage. The obtained results show that YS-Fe2O3@NC delivers a high reversible capacity of 578 mA h g−1 after 300 cycles at a current density of 5 A g−1, about 11 times that (53.7 mA h g−1) of pristine Fe2O3. Furthermore, a high specific capacity of 300.5 mA h g−1 even at 10 A g−1 is achieved. The high reversible capacities, excellent rate capability and cycle stability of YS-Fe2O3@NC might be attributed to the elaborate yolk–shell nanoarchitecture. Moreover, electron percolation and a local built-in electric field induced by oxygen vacancies in the Fe2O3 matrix could also enhance the kinetics of Li+ insertion/deinsertion.
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