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Shuquan Liang,Mulan Qin,Yan Tang,Qing Zhang,Xilin Li,Anqiang Pan 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.5
Nanosheet-structured vanadium pentoxide (V2O5) has been fabricated by a sol-gel method. As revealed bythe TEM, the as-synthesized V2O5 crystallites are composed of layer-by-layer stacked nanosheets. As acathode material for lithium batteries, it exhibits much better electrochemical performance than the startingcommercial V2O5 powders. A high specific discharge capacity of 264 mA h g-1 can be obtained for thenanosheet-structured electrodes, which retains the capacity of 90% after 50 cycles. However, the commercialV2O5 only delivers a specific discharge capacity of 206 mA h g-1 with a capacity retention of 64%after 50 cycles. Moreover, the nanosheet-structured V2O5 electrodes show much-improved C-rate capability. The superior cycling performance demonstrates that the nanosheet-structured V2O5 is a promising cathodematerial in lithium-ion battery applications.
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Liu, Dawei,Liu, Yanyi,Garcia, Betzaida Batalla,Zhang, Qifeng,Pan, Anqiang,Jeong, Yoon-Ha,Cao, Guozhong The Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.46
<p>V<SUB>2</SUB>O<SUB>5</SUB> xerogel films were fabricated by casting V<SUB>2</SUB>O<SUB>5</SUB> sols onto FTO glass substrates and annealing at 300 °C for 3 hours in nitrogen and air. The films annealed in nitrogen and air possessed different grain size and crystallinity. Optical absorption measurements and electrochemical impedance analyses revealed a reduced optical bandgap and enhanced electrical conductivity of N<SUB>2</SUB> annealed V<SUB>2</SUB>O<SUB>5</SUB> film. Lithium ion intercalation measurements showed that at a charge/discharge current density of 600 mAg<SUP>−1</SUP>, the N<SUB>2</SUB> annealed sample possessed noticeably better lithium ion storage capability. In contrast to the air annealed sample, which started with a discharge capacity of 152 mAhg<SUP>−1</SUP> but after 50 cycles the capacity had decreased to a low value of only 44 mAhg<SUP>−1</SUP>, the N<SUB>2</SUB> annealed sample started with a low value of 68 mAhg<SUP>−1</SUP> but the capacity increased sharply to a high value of 158 mAhg<SUP>−1</SUP> at the 24<SUP>th</SUP> cycle, followed by little capacity degradation in later cycles and after 50 cycles, the discharge capacity was still as high as 148 mAhg<SUP>−1</SUP>. Much improved lithium ion intercalation capacity and cyclic stability could be attributed to surface defects V<SUP>4+</SUP> and/or V<SUP>3+</SUP> and associated oxygen vacancies introduced by N<SUB>2</SUB> annealing as well as much less crystallized vanadium oxide.</p> <P>Graphic Abstract</P><P>V<SUB>2</SUB>O<SUB>5</SUB> films annealed in N<SUB>2</SUB> exhibited a much improved lithium ion intercalation capability as compared to counterparts annealed in air, highly favoring potential application as lithium ion battery electrodes. <img src='http://pubs.rsc.org/ej/JM/2009/b914436f/b914436f-ga.gif'> </P>
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