(NH4)0.5V2O5 nanobelt.pdfVIP

( L H a b c a A R R A A K L A H S E 1 a t A v p s [ a r d t l a w [ l ( H 0 dJournal of Power Sources 196 (2011) 5645–5650 Contents lists available at ScienceDirect Journal of Power Sources journa l homepage: www.e lsev ier .com/ locate / jpowsour NH4)0.5V2O5 nanobelt with good cycling stability as cathode material for i-ion battery aiyan Wanga, Kelong Huanga,?, Chenghuan Huanga, Suqin Liua, Yu Renb, Xiaobing Huangc School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China EaStChem and School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, UK Chengdu Institute of Organic Chemistry, Chinese Academy of Science, Chengdu 610041, China r t i c l e i n f o rticle history: eceived 1 November 2010 eceived in revised form 11 January 2011 ccepted 17 February 2011 vailable online 24 February 2011 a b s t r a c t (NH4)0.5V2O5 nanobelt is synthesized by sodium dodecyl benzene sulfonate (SDBS) assisted hydrother- mal reaction as a cathode material for Li-ion battery. The as-prepared (NH4)0.5V2O5 nanobelts are 50–200nm in diameter and several micrometers in length. The reversible lithium intercalation behav- ior of the nanobelts has been evaluated by cyclic voltammetry, galvanostatic discharge–charge cycling,eywords: i-ion battery mmonium divanadate nanobelt ydrothermal method odium dodecyl benzene sulfonate lectrochemical performance and electrochemical impedance spectroscopy. The (NH4)0.5V2O5 delivers an initial specific discharge capacity of 225.2mAhg?1 between 1.8 and 4.0V at 15mAg?1, and still maintains a high discharge capac- ity of 197.5mAhg?1 after 11 cycles. It shows good rate capability with a discharge capacity of about 180mAhg?1 remaining after 40 cycles at various rates and excellent cycling stability with the capac- ity retention of 81.9% after 100 cycles at 150mAg?1. Interestingly, the excess 120mAhg?1 capacity in the first charge process is observed, most of which could be attributed to the extraction of NH4+