Plasma-Induced Amorphous Shell and Deep Cation-Site S Doping Endow TiO with Extraordinary Sodium Storage Performance.

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Advanced materials (Deerfield Beach, Fla.), ISSN: 1521-4095, Vol: 30, Issue: 26, Page: e1801013

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He, Hanna; Huang, Dan; Pang, Wei Kong; Sun, Dan; Wang, Qi; Tang, Yougen; Ji, Xiaobo; Guo, Zaiping; Wang, Haiyan
Materials Science; Engineering; sodium; extraordinary; tio2; endow; doping; storage; cation-site; performance; deep; shell; amorphous; plasma-induced; Physical Sciences and Mathematics
article description
Structural design and modification are effective approaches to regulate the physicochemical properties of TiO , which play an important role in achieving advanced materials. Herein, a plasma-assisted method is reported to synthesize a surface-defect-rich and deep-cation-site-rich S doped rutile TiO (R-TiO -S) as an advanced anode for the Na ion battery. An amorphous shell (≈3 nm) is induced by the Ar/H plasma, which brings about the subsequent high S doping concentration (≈4.68 at%) and deep doping depth. Experimental results and density functional theory calculations demonstrate greatly facilitated ion diffusion, improved electronic conductivity, and an increased mobility rate of holes for R-TiO -S, which result in superior rate capability (264.8 and 128.5 mAh g at 50 and 10 000 mA g , respectively) and excellent cycling stability (almost 100% retention over 6500 cycles). Such improvements signify that plasma treatment offers an innovative and general approach toward designing advanced battery materials.