Rational design and facile synthesis of TiO2 based hybrid electrodes with hierarchical microstructure have great advantages for exploration of advanced electrodes for lithium-ion batteries (LIBs). We design and synthesize hierarchical hollow microspheres with inner carbon skeleton supported outer TiO2-x few-layer nanosheets (C@TiO2-x). The "core-shell" C@TiO2-x microspheres exhibit relatively high specific surface area and a remarkable electric conductivity (0.264 μS cm-1). The lithium kinetics of C@TiO2-x microspheres is significantly improved due to synergistic effects of few-layer TiO2-x nanosheets and conductive carbon skeleton. The C@TiO2-x microspheres manifest an excellent reversible capacity of 323 mAh g-1, together with an ultralong cycling lifetime that the capacity shows ∼220 mAh g-1 after 1000 cycles at 1.0 C. The C@TiO2-x microspheres also deliver a relatively high performance in rate capacity (108 mAh g-1 at 20 C). When they are assembled into a hybrid lithium-ion capacitor, relatively high capacitance of 58 F g-1 is achieved so that high power density reaches 14 kW kg-1.
Bibliographical noteFunding Information:
This work was financially supported by National Key Research and Development Program (Grant 2016YFB0901600), the Science and Technology Commission of Shanghai (Grant Nos. 16ZR1440500 and 16JC1401700), the National Science Foundation of China (Grant 51672301), the Key Research Program of Chinese Academy of Sciences (Grant Nos. QYZDJ-SSW-JSC013 and KGZD-EW-T06), the CAS Center for Excellence in Superconducting Electronics, and the Youth Innovation Promotion Association CAS.
© 2018 American Chemical Society.
- carbon skeleton
- hollow microspheres
- lithium ion batteries
- TiO few-layer nanosheets
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Materials Chemistry
- Electrical and Electronic Engineering