期刊
CHEMICAL ENGINEERING JOURNAL
卷 373, 期 -, 页码 565-571出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.05.065
关键词
Nancubes; Sodium ion battery; Anode; Lattice spacing
资金
- National Natural Science Foundation of China [21572269, 21502227, 51873231]
- Fundamental Research Funds for the Central Universities [17CX05015, 15CX08005A]
- Taishan Scholar Project
- Key Research and Development Program of Shandong Province, China [2017GGX40118]
Sodium-ion batteries (SIBs) are considered as promising new-fashioned energy storage devices. Among these anode materials of SIBs, the low specific capacity and poor rate capability of TiO2 are two significant factors of hindering the widely application. Here, a unique hollow TiO2/carbon nanocubes (hollow-TiO2@C-800) with enlarged lattice spacing of TiO2 have been synthesized. Experimental results demonstrate that the enlarged lattice spacing of TiO2 could facilitate Na ions desertion/insertion and inhibit the irreversible side reactions, resulting in fast Na ion transfer kinetics. Moreover, N-doped hollow porous carbon framework could boost the conductivity, inhibit the agglomeration of the smaller TiO2 and shorten the distance for Na+ transfer, which lead to lower mechanical stresses and smaller capacity loss during cycles. As expected, hollow-TiO2@C-800 shows a superior cycling stability (154.6 mAh g(-1) after 6000 cycles at 5000 mA g(-1)) and an excellent rate capability (150 mAh g(-1) at 8000 mA g(-1)). This simple synthetic method would open a new avenue to prepare the superior SIBs anode.
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