期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 814, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152342
关键词
Tin dioxide; Hollow TiO2@SnO2@C nanospheres; Restrain volume expansion; Lithium-ion batteries; Negative material
资金
- National Natural Science Foundation of China [51764029, 51665022, 51601081]
- Yunnan Natural Science Foundation [2018FB087]
SnO2 is regarded as a promising negative material candidate for contemporary lithium-ion batteries (LIBs). However, the nanostructured SnO2 electrodes suffer from rapid capacity fades during lithiation and delithiation at a high-current density due to active materials aggregating and cracking. Herein, we designed and fabricated a novel multilayered hollow TiO2@SnO2@C sphere electrode though a facile three-step sol-gel coating process and hydrothermal strategy. The SnO2 nanoparticles are well confined between an outermost high-conductivity carbon layer and innermost stable hollow TiO2 nanospheres that form the pillar structure of the entire composite. Attributed to the internal spherical titanium dioxide as a support layer, the structural integrity of the composite and the possible anti-inward rupture can be effectively improved. As a result, the as-prepared TiO2@SnO2@C electrode exhibits a remarkable reversible capacity of 484 mAh g(-1) at 0.2 A g(-1) after 300 cycles and delivers outstanding capacity of 263 mAh g(-1) at 3 A g(-1). Moreover, this unique SnO2 hollow sphere structure with TiO2 as the innermost stable pillar will have implications for the design of high-power-density negative materials for future lithium-ion batteries. (C) 2019 Published by Elsevier B.V.
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