High performance TiP2O7 nanoporous microsphere as anode material for aqueous lithium-ion batteries

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 118-125
• 页数: 8页
• 语种: 英文

摘要

This work developed a facile way to mass-produce a carbon-coated TiP2O7 nanoporous microsphere (TPO-NMS) as anode material for aqueous lithium-ion batteries via solid-phase synthesis combined with spray drying method.TiP2O7 shows great prospect as anode for aqueous recharge able lithium-ion batteries (ALIBs) in view of its appropriate intercalation potential of -0.6 V (vs.SCE) before hydrogen evolution in aqueous electrolytes.The resulting sample presents the morphology of secondary microspheres (ca.20 μm) aggregated by carbon-coated primary nanoparticles (100 nm),in which the primary nanoparticles with uniform carbon coating and sophisticated pore structure greatly improve its electrochemical performance.Consequently,TPONMS delivers a reversible capacity of 90 mA h/g at 0.1 A/g,and displays enhanced rate performance and good cycling stability with capacity retention of 90％ after 500 cycles at 0.2 A/g.A full cell containing TPO-NMS anode and LiMn2O4 cathode delivers a specific energy density of 63 W h/kg calculated on the total mass of anode and cathode.It also shows good rate capacity with 56％ capacity maintained at 10 A/g rate (vs.0.1 A/g),as well as long cycle life with the capacity retention of 82％ after 1000 cycles at 0.5 A/g.