TiP2O7 and Expanded Graphite Nanocomposite as Anode Material for Aqueous Lithium-Ion Batteries
TiP2O7 and Expanded Graphite Nanocomposite as Anode Material for Aqueous Lithium-Ion Batteries
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TiP2O7 和膨胀石墨纳米复合材料作为水系锂离子电池负极材料
DOI：
10.1021/acsami.6b14856
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发表时间：
2017
影响因子：
9.5
通讯作者：
Xia Yongyao
中科院分区：
文献类型：
--
作者：
Wen Yunping;Chen Long;Pang Ying;Guo Zhaowei;Bin Duan;Wang Yong-gang;Wang Congxiao;Xia Yongyao
采用溶胶-凝胶法成功制备了TiP 2 O 7/膨胀石墨（EG）纳米复合材料，并将其应用于水溶液锂离子电池负极材料的制备。所构建的TiP 2 O 7纳米复合材料（50-100 nm）原位包覆在膨胀石墨的孔和层结构中，具有良好的导电性和高的比表面积。因此，所得的TiP 2 O 7/EG电极在水电解质中析氢之前在-0.6 V的适当电位下在0.1 A g-1下表现出66 mAh g-1的可逆容量，并且还表现出极大增强的循环稳定性，在0.5 A g-1的电流密度下1000次循环后容量保持率为75%。以TiP_2O_7/EG为阳极，LiMn_2O_4为阴极，在1.4 V的工作电压下，1 M的Li 2SO 4电解质的比能量为60 Wh kg-1（以正极和负极材料的重量计算）。该电解质还具有优异的上级倍率性能和优异的循环性能，在0.2 A g-1和61%的电流下，500次循环的容量保持率分别为66%和61%。在1A g-1下循环2000次。
This paper reports a facile sol–gel synthesis method to successfully prepare the TiP2O7/expanded graphite (EG) nanocomposite as an advanced anode material for aqueous lithium-ion batteries. The constructed TiP2O7nanocomposites (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 TiP2O7/EG electrode exhibits a reversible capacity of 66 mAh g–1at 0.1 A g–1with 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–1. A full cell consisting of TiP2O7/EG anode, LiMn2O4cathode, and 1 M Li2SO4electrolyte delivers a specific energy of 60 Wh kg–1calculated 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–1and 61% at 1 A g–1over 2000 cycles.