博彩平台

Yu Fu^a, Hai Ming^a, Shiyong Zhao^c, Jun Guo^c Muzi Chen^d Qun Zhou^a *（周群）, Junwei Zheng^{a, b,} *（郑军伟）

^a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China

^b College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, PR China

^c Zhangjiagang Guotai Huarong New Chemical Material Co., Ltd., No. 112, Chengdong Road, Zhangjiagang, PR China

^d Analysis and Testing Center, Soochow University, Suzhou 215123, PR China

Electrochimica Acta，Volume 185, 10 December 2015, Pages 211–217

Lithium titanium oxyphosphate LiTiOPO₄ is synthesized by a solution route and modified with a carbon layer using polyvinylidene difluoride as carbon source. It is demonstrated that the performance of LiTiOPO₄ strongly depends on cycling potential range. In the potential range from 0.5 to 3.0 V, limited capacity (less than 161 mA h g⁻¹) is obtained, which is ascribed to a mechanism involving the insertion of lithium ions into vacant sites of crystalline structure. As the cut-off potential is set down to 0.1 V, a conversion of LiTiOPO₄ occurs in the initial cycle, as a result, a relative high and reversible capacity of 285 mA h g⁻¹ at the current rate of 0.1 C can be achieved during the subsequent cycles. However, resembling that of transition metal oxides, possible charging/discharging mechanism, in this case, may involve the formation and decomposition of Li₂O formed in the conversion of LiTiOPO₄. The new strategy also enables LiTiOPO₄ as the electrode material with superior cycleability and rate capability of 195 mA h g⁻¹ at the current rate of 2.0 C. The results indicate that carbon-coated LiTiOPO₄ could be a promising anode material with relative high capacity and good rate capability for lithium ion batteries.