Exploring the Electrochemical Superiority of V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub>@Ti<sub>3</sub>C<sub>2</sub>-MXene Hybrid Nanostructures for Enhanced Lithium-Ion Battery Performance
Waimon Myint, Kittima Lolupiman, Chengwu Yang, Pattaraporn Woottapanit, Wanwisa Limphirat, Pinit Kidkhunthod, Muhammad Muzakir, M. Karnan, Xinyu Zhang, Jiaqian Qin
Abstract
High Resolution Image Download MS PowerPoint Slide The use of vanadium(V)-based materials as electrode materials in electrochemical energy storage (EES) devices is promising due to their structural and chemical variety, abundance, and low cost. V-based materials with a layered structure and high multielectron transfer in the redox reaction have been actively explored for energy storage. Our current work presents the structural and electrochemical properties of a vanadium-based composite with TiO 2 @Ti 3 C 2 MXene, referred to as VM. This composite is obtained through the in situ thermal decomposition of the VO 2 (OH)/Ti 3 C 2 mixture, which is achieved by solution mixing and drying. The material structure is confirmed using various characterization tools, which establish an orthorhombic V 2 O 5 nanostructure compositing with nanocrystalline TiO 2 @Ti 3 C 2 . VM with 5 wt % MXene, referred to as VM5, can achieve 460 mAhg –1 at a current density of 0.1 Ag 1– and 290 mAhg –1 at 1 Ag 1–, with an average coulombic efficiency of 98.5%. The presence of the V 2 O 5 /TiO 2 (nanocrystals) heterojunction attached with Ti 3 C 2 sheets contributed to reduced charge transfer resistance. The cyclic stability shows a capacity retention of 62% over 500 cycles at 1 Ag 1– (4C rate, where 1C equals 0.25 Ag 1– ) with a 0.22 capacity drop with each cycle. Dunn’s approach to examining the charge storage mechanism demonstrates 72% contribution of the surface-dominant capacitive process and 28% of the diffusion-controlled intercalation process at 0.4 mVs –1, suggesting a potential high-performance pseudocapacitive hybrid electrode material for lithium-ion batteries.