title: TiP2O7and Expanded Graphite Nanocomposite as Anode Material for Aqueous Lithium-Ion Batteries.
abstract: 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.
authors.affiliation: 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.
authors.forename: Yunping
authors.initials: Y
authors.lastname: Wen
authors.affiliation: 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.
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.affiliation: 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.
authors.forename: Ying
authors.initials: Y
authors.lastname: Pang
authors.affiliation: 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.
authors.forename: Zhaowei
authors.initials: Z
authors.lastname: Guo
authors.affiliation: 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.
authors.forename: Duan
authors.initials: D
authors.lastname: Bin
authors.affiliation: 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.
authors.forename: Yong-Gang
authors.identifier: http://orcid.org/0000-0002-2447-4679
authors.initials: YG
authors.lastname: Wang
authors.affiliation: 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.
authors.forename: Congxiao
authors.initials: C
authors.lastname: Wang
authors.affiliation: 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.
authors.forename: Yongyao
authors.identifier: http://orcid.org/0000-0001-6379-9655
authors.initials: Y
authors.lastname: Xia
keywords: H2 evolution reaction; TiP2O7; anode materials; aqueous lithium-ion batteries; expanded graphite