期刊
ELECTROCHIMICA ACTA
卷 182, 期 -, 页码 406-415出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.09.099
关键词
Reduced graphene oxide; TiO2; Solvothermal; Lithium ion batteries
资金
- National Natural Science Foundation of China [20841003, 21261130584, 20741001]
- New Century Outstanding Scholar Supporting Program
Novel porous carbon-coated mixed-phase porous TiO2 (TiO2(B)/anatase) nanosheets/reduced graphene oxide composites (TiO2@C/RGO) are successfully prepared through a facile one-pot solvothermal process followed by subsequent heat treatment in H-2/Ar. The as-formed composites have a hierarchical porous structure, involving an average pore size of 28.56 nm, a large pore volume of 0.589 cm(3) g(-1) and a desired surface area (136.19 m(2) g(-1)). When used as an anode material in LIBs, TiO2@C/RGO exhibits stable cycling performance with a reversible capacity of 272.9 mAh g(-1) (with the second capacity retention of 151.1%) after 500 cycles at a current density of 100 mA g(-1), much higher than that of TiO2@C (177.6 mAh g(-1), 123.9% of the discharge capacity in second cycle) and TiO2 (75.1 mAh g(-1), corresponding to 96.5% of the original capacity). More impressively, the capacity of TiO2@C/RGO can reach 158.6 mAh g(-1) after 500 cycles even at 800 mA g(-1) with Coulombic efficiency above 99.0%. The superior electrochemical performance of TiO2@C/RGO may be attributed to its unique 3D hierarchical porous structures, the existence of carbon, large surface area and extremely reduced diffusion length. (C) 2015 Elsevier Ltd. All rights reserved.
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