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VPO4@C/graphene microsphere as a potential anode material for lithium-ion batteries

Three-dimensional PO4-based polyanionic structures composed of interconnected MO6 octahedra and PO4 tetrahedra, such as VPO4, are potential anode materials for Li-ion batteries given their excellent cyclic stability. However, the application of VPO4 as an anode material has been limited by its low conductivity and drastic volume expansion. Herein, VPO4@C/graphene microspheres are designed and synthesised. P covalently bridges VPO4 and graphene through P–C bonding and acts as a buffer layer to maintain structural stability during continuous charge–discharge cycling. Graphene and C improve the electrical conductivity of VPO4 and reduce volume expansion during charge–discharge cycling. When applied as a Li-ion battery anode, the VPO4@C/graphene microspheres can achieve a specific capacity of 432.8?mA?h?g?1 after 100 cycles under the current densities of 100?mA?g?1. This performance is superior to that of commercial graphite. The VPO4 @C/graphene microspheres provide a good rate performance with a capacity of 562.1, 494, 424.2 and 356?mAh?g?1 under 200, 400, 1000 and 2, 000?mA?g?1, respectively. Furthermore, the VPO4@C/graphene microspheres achieve high tap density of >?1.2?g?cm?3, which is higher than that of other nanomaterials (

» Author: Lin-bo Tang, Bin Xiao, Chang-sheng An, Hui Li, Zhen-jiang He, Jun-chao Zheng

» Reference: 10.1016/j.ceramint.2018.05.056

» Publication Date: 15/08/2018

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