期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 50, 页码 43648-43656出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b13382
关键词
TiO2; nanostructures; biphase interface; sodium-ion batteries; DFT calculations
资金
- National Nature Science Foundation of China [21471090, 61527809]
- Key Research and Development Programs of Shandong Province [2017GGX40101]
- Taishan Scholarship in Shandong Provinces [ts201511004]
Flower-like assembly of ultrathin nanosheets composed of anatase and bronze TiO2 embedded in carbon is successfully synthesized by a simple solvothermal reaction, followed with a high-temperature annealing. As an anode material in sodium-ion batteries, this composite exhibits outstanding electrochemical performances. It delivers a reversible capacity of 120 mA h g(-1) over 6000 cycles at 10 C. Even at 100 C, there is still a capacity of 104 mA h g(-1). Besides carbon matrix and hierarchical structure, abundant interfaces between anatase and bronze greatly enhance the performance by offering additional sites for reversible Na+ storage and improving the charge-transfer kinetics. The interface enhancements are confirmed by discharge/charge profiles, rate performances, electrochemical impedance spectra, and first-principle calculations. These results offer a new pathway to upgrade the performances of anode materials in sodium-ion batteries.
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