Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEm (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University , Shanghai 200433, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Mar 8;9(9):8075-8082. doi: 10.1021/acsami.6b14856. Epub 2017 Feb 27.
This paper reports a facile sol-gel synthesis method to successfully prepare the TiPO/expanded graphite (EG) nanocomposite as an advanced anode material for aqueous lithium-ion batteries. The constructed TiPO nanocomposites (50-100 nm) are in situ encapsulated in the pore and layer structure of expanded graphite with good conductivity and high specific surface area. As a consequence, the resulting TiPO/EG electrode exhibits a reversible capacity of 66 mAh g at 0.1 A g with an appropriate potential of -0.6 V before hydrogen evolution in aqueous electrolytes, and also demonstrates greatly enhanced cycling stability with 75% capacity retention after 1000 cycles at the current density of 0.5 A g. A full cell consisting of TiPO/EG anode, LiMnO cathode, and 1 M LiSO electrolyte delivers a specific energy of 60 Wh kg calculated on the weight of both cathode and anode materials with an operational voltage of 1.4 V. It also exhibits superior rate capability and remarkable cycling performance with a capacity maintenance of 66% over 500 cycles at 0.2 A g and 61% at 1 A g over 2000 cycles.
本文报道了一种简便的溶胶-凝胶法成功制备了 TiPO/膨胀石墨（EG）纳米复合材料，作为用于水系锂离子电池的先进的阳极材料。构建的 TiPO 纳米复合材料（50-100nm）原位包裹在具有良好导电性和高比表面积的膨胀石墨的孔和层结构中。结果，所得到的 TiPO/EG 电极在水系电解液中具有可逆容量为 66mAh g 在 0.1Ag 时，适当的电位为-0.6V 之前的析氢电位，并且还表现出大大增强的循环稳定性，在电流密度为 0.5Ag 时，1000 次循环后容量保持率为 75%。由 TiPO/EG 阳极、LiMnO 阴极和 1M LiSO 电解质组成的全电池在操作电压为 1.4V 时，以阴极和阳极材料的重量计算，具有 60Whkg 的比能量。它还表现出优异的倍率性能和显著的循环性能，在 0.2Ag 时 500 次循环后容量保持率为 66%，在 1Ag 时 2000 次循环后容量保持率为 61%。
