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“Electron-Sharing” Mechanism Promotes [email protected]3O4/CNTs Composite as the High-Capacity Anode Material of Lithium-Ion Battery
- Yantao ZhaoYantao ZhaoState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Yantao Zhao,
- Wujie DongWujie DongState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Wujie Dong,
- Muhammad Sohail RiazMuhammad Sohail RiazState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Muhammad Sohail Riaz,
- Hongxin GeHongxin GeState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Hongxin Ge,
- Xin WangXin WangState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Xin Wang,
- Zichao LiuZichao LiuState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Zichao Liu, and
- Fuqiang Huang*Fuqiang Huang*E-mail: [email protected]State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Fuqiang Huang
Abstract
Hybridization of nanostructured cobalt oxides with carbon nanotubes (CNTs) is considered to be an operative approach to harvest high-performance anode material for lithium-ion batteries (LIBs). On the other hand, there are numerous related works, most of which adopted a “post-combination” strategy, which is not only complicated but also ecologically unpromising for using toxic acid for surface modification of CNTs. Herein, we productively fabricate [email protected]3O4/CNTs nanocomposite with excellent conductivity through arc discharge following low-temperature oxidation in air. As the anode material for LIBs, this nanocomposite shows an exceedingly high reversible capacity of 820 mA h g–1 at a current density of 0.2 A g–1 after 250 cycles, much higher than its theoretical capacity. The rate performance of the material is also outstanding, with a capacity of 760 mA h g–1 after 350 cycles at 1 A g–1 (103% of the initial capacity) and 529 mA h g–1 after 600 cycles at 2 A g–1. X-ray photoelectron spectroscopy tests are accomplished to disclose the true cause of extra capacity. And for the first time, we propose an “electron-sharing” storage mode, where extra electrons and Li+ can separate and be stored at the interface of cobalt metal/Li2O. This not only gives a reasonable revelation for this unusual capacity exceeding the theoretical value but also directs the capacitor-like electrochemical behavior extra capacity.
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