SnO2/TiO2 Nanocomposite Prepared by Pulsed Laser Deposition as Anode Material for Flexible Quasi-solid-state Lithium-Ion Batteries
Wanli Wang, Yuhao Li, Liwei Li, Licheng Wang, Kai Wang
Abstract
SnO 2 /TiO 2 nanoparticle structure were prepared by alternately depositing SnO 2 and TiO 2 by pulsed laser deposition (PLD) system as the anode of lithium-ion batteries. The prepared SnO 2 /TiO 2 electrode material has a high reversible capacity (809.30 mAh g -1 capacity after cyclic testing for 100 times at a current density of 100 mA g -1 ) and a high rate capability (488.71 mAh g -1 capacity at a current density of 3000 mA g -1 ). The nanoparticle membrane structure significantly shortens the diffusion distance of lithium ions and effectively buffers the stress generated in the process of cyclic charging and discharging. Moreover, the two oxide particles, SnO 2 and TiO 2 , are distributed at intervals throughout the electrode, which greatly limits the position migration of nanoparticles in the circulation process, thereby it significantly enhances the integrity and stability of the electrode structure in the circulation process. Besides, the SnO 2 /TiO 2 film with nanoparticle structure was successfully applied to the flexible quasi-solid-state batteries, which can easily light up the blue high-power LED in different bending states. These excellent electrochemical properties confirm the importance of our work for providing a new strategy to produce anode materials for lithium-ion batteries. Our work may shed light on the design of anode materials in high-performance lithium-ion batteries, exceptionally thin-film micro batteries and flexible lithium-ion batteries.