Synthesis of mesoporous TiO2@C@MnO2 multi-shelled hollow nanospheres with high rate capability and stability for lithium-ion batteries. Issue 69 (11th July 2016)

• Record Type: Journal Article
• Authors: Liu, Li; Peng, Jun; Wang, Gang; Ma, Yanqing; Yu, Feng; Dai, Bin; Guo, Xu-Hong; Wong, Ching-Ping
• Is Part Of: RSC advances. Volume 6:Issue 69(2016)
• Page Start: 65243
• Page End: 65251
• Publication Date: 2016-07-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra14156k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Mesoporous TiO2 @C@MnO2 multi-shelled hollow nanospheres (denoted as TiO2 @C@MnO2 multi-shelled HNSs) prepared by a layer-by-layer deposition growth process exhibit high rate capability and stability. Abstract : While TiO2 is regarded as a good anode material for Li ion storage because of its excellent cycling stability, high safety and low cost, its practical applications for Li-ion batteries (LIBs) still present a great challenge due to its poor conductivity and low theoretical capacity. A hybrid nanostructured electrode design offers opportunities to circumvent these drawbacks. Herein, we report a cost-effective strategy for the fabrication of mesoporous TiO2 @C@MnO2 multi-shelled hollow nanospheres as LIBs anodes. The multiple-shelled structure effectively couples the electrochemical functionality of TiO2, MnO2 and C including: the excellent stability of TiO2, the large capacity of MnO2, and the high electronic conductivity of the carbon layer. Meantime, the mesoporous shells and hollow nanostructure design not only provide fast Li + transportation throughout the electrode, but also can further buffer the volume expansion of electrodes during charge/discharge. As a result, TiO2 @C@MnO2 multi-shelled hollow nanospheres exhibit an enhanced charge/discharge capacity (506.8 mA h g −1 at the rate of 0.3C after 100 cycles) and excellent rate performance (278.7 mA h g −1 at 3C after 200 cycles), much better than the individual parts. Our work on hybrid hollow structures with multiple shells demonstrates an efficient way to realize the enhancement of the electrochemical performance of LIB anode materials, thus casting light on the development of advanced anode materials for next-generation, high-performance LIBs.