| Lithium-ion batteries (LIBs) are extensively used in the present-day portable electronic gadgets, the motivation for the studies of new anode materials with long cycle life and high capacity comes from the urge to meet the demands of the pure electric and hybrid vehicles. SnO2-based anode materials have attracted much attention for their high capacity. On the other hand, the Te-containing compounds have attracted much interest. Te exhibits multiple covalent bonds and TeO2 crystal contains cavities and tunnels, so it may be used as electrode material for lithium-ion battery.In the present work, SnO2- and TeO2-based materials were synthesized, and their properties for LIBs have also been investigated in details.(1) A solid solution of Sn1-xInxO2 has been successfully prepared using K2SnO3 and In(NO3)3 as precursor by a simple hydrothermal method. The indium in the SnO2 host lattice stabilized the nanophasic nature of Sn1-xInxO2 and prevented grain growth. When using as anode materials, the In-doped SnO2 exhibited lower first cycle irreversible capacity and better cyclic performances than undoped SnO2.(2) Sn1-xInxO2 hollow spheres were synthesized using carbonaceous polysaccharide microspheres as templates and SnSO4 and In(NO3)3 as precursor. Its electrochemical properties were also studied, which exhibited enhanced cycling performance and maintained a reversible capacity of 549.6 mAhg-1 after 50 cycles with the Coulombic efficiency of 99% in 10th cycle.(3) The anode material of Cl-doped TeO2 was fabricated via a thermal decomposition of Te6O11Cl2 in situ. Forthermore, Te6O11Cl2, α-TeO2 and TeO2Clx were first used as anode materials for LIBs. It was found Cl-doped TeO2 showed a greater cyclic stability, A reversible capacity of 294.2 mAhg"1 was kept with a capacity retention of 87.5% after 50 cycles. This might be attributed to the fact that the presence of Te-Cl bond on the surface of material would benefit good electrochemical properties during Li-ion intercalation reaction. |
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