期刊
NANO ENERGY
卷 54, 期 -, 页码 227-237出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.10.025
关键词
TiNb24O62; N-doped carbon coating; First principles calculations; In-situ XRD; Full cell
类别
资金
- National Natural Science Foundation of China [U1632114]
- Ningbo Key Innovation Team [2014B81005]
- K.C. Wong Magna Fund in Ningbo University
TiNb24O62 with large theoretical capacity and safe working potential is regarded as a candidate for lithium ion batteries. However, poor electronic conductivity of TiNb24O62 restricts its widely application. Herein, we propose a novel methodology concerned about nitrogen-doped carbon coating to improve the electrochemical performance of TiNb24O62 nanowires. According to a series of analyses, it is found that nitrogen-doped carbon coating plays a key role on improving the electronic conductivity and electrochemical activity of TiNb24O62 nanowires. Meanwhile, both first principles calculations and in-situ XRD technique are applied to realize the structural evolution of nitrogen-doped carbon coated TiNb24O62 nanowires. The obtained results show a high diffusion channel for lithium ions in the lattice of TiNb24O62 and the good electrochemical reversibility of nitrogen-doped carbon coated TiNb24O62 nanowires. In addition, a full lithium ion battery is assembled by using nitrogen-doped carbon coated TiNb24O62 nanowires as anode and LiFePO4 as cathode. Such a cell can deliver a high capacity, indicative of a great potential for practical applications. Therefore, nitrogen-doped carbon coated TiNb24O62 nanowires can be a promising anode for high-rate lithium ion batteries.
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