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Hu X.B.,Chongqing University of Technology | Hu X.B.,Chongqing Enterprise Engineering Technology Research Center for Phosgene Derivatives | Lin Z.J.,Sichuan Provincial Center for Quality Supervision and Inspection of Alcohol Packaging Products | Lin Z.J.,Luzhou Products Quality Supervision and Inspection Institute | Zhang Y.L.,Chongqing University of Technology
Advanced Materials Research | Year: 2014

A hybrid battery-supercapacitor (LiFePO4+AC)/Li4Ti5O12 using a Li4Ti5O12 anode and a LiFePO4/activated carbon(AC) composite cathode was built. The electrochemical performances of the hybrid battery-supercapacitor (LiFePO4+AC)/Li4Ti5O12 were characterized by constant current charge-discharge, rate charge-discharge, electrochemical impedance spectra, internal resistance, leakage current, self-discharge and cycle performance testing. The results show that (LiFePO4+AC)/Li4Ti5O12 hybrid battery-supercapacitors have rapid charge-discharge performance, high energy density, long cycle life, low resistance, low leakage current and self-discharge rate, which meet the requirements of practical power supply and can be applied in auxiliary power supplies for hybrid electric vehicles. At 4C rate, the capacity loss of (LiFePO4+AC)/Li4Ti5O12 hybrid battery-supercapacitors in constant current mode is no more than 7.71% after 2000 cycles, and the capacity loss in constant current- constant voltage mode is no more than 4.51% after 1500 cycles. © (2014) Trans Tech Publications, Switzerland. Source


Zhang Y.,Chongqing University of Technology | Lin Z.,Sichuan Provincial Center for Quality Supervision & Inspection of Alcohol Packaging Products | Lin Z.,Luzhou Products Quality Supervision & Inspection Institute | Hu X.,Chongqing University of Technology | And 4 more authors.
Journal of Solid State Electrochemistry | Year: 2016

Spinel Li4Ti5O12/C composites were obtained from C3H5O3Li and TiO2 via one-step solid-state reaction without adding extra carbon sources. This facile synthesis method can reduce production steps, contribute to uniform mixing of raw materials, and get homogenous particles. As-prepared Li4Ti5O12/C composites with low in situ carbon content of only 1.81 wt% show significant improvement in discharge capacity and high rate cycling performance comparable to Li4Ti5O12/C in previous studies, showing that low in situ carbon content in the as-prepared Li4Ti5O12/C composites perfectly balances discharge capacity and high rate cycling performance. At 1 C and 10 C, the initial discharge capacity is 168.0 and 140.0 mAh g−1 with capacity retention of 94.4 and 90.2 % after 200 cycles, respectively. Even at 20 C, the discharge capacity is 133.3 mAh g−1 at 1st cycle and 109.8 mAh g−1 at 50th cycle. It demonstrated promising potential as an anode material in lithium-ion batteries with excellent discharge capacity and high rate cycling performance. © 2015, Springer-Verlag Berlin Heidelberg. Source


Zhang Y.,Chongqing University of Technology | Lin Z.,Sichuan Provincial Center for Quality Supervision & Inspection of Alcohol Packaging Products | Lin Z.,Luzhou Products Quality Supervision & Inspection Institute | Hu X.,Chongqing University of Technology | And 4 more authors.
Journal of Solid State Electrochemistry | Year: 2015

Spinel Li4Ti5O12/C composites were obtained from C3H5O3Li and TiO2 via one-step solid-state reaction without adding extra carbon sources. This facile synthesis method can reduce production steps, contribute to uniform mixing of raw materials, and get homogenous particles. As-prepared Li4Ti5O12/C composites with low in situ carbon content of only 1.81 wt% show significant improvement in discharge capacity and high rate cycling performance comparable to Li4Ti5O12/C in previous studies, showing that low in situ carbon content in the as-prepared Li4Ti5O12/C composites perfectly balances discharge capacity and high rate cycling performance. At 1 C and 10 C, the initial discharge capacity is 168.0 and 140.0 mAh g−1 with capacity retention of 94.4 and 90.2 % after 200 cycles, respectively. Even at 20 C, the discharge capacity is 133.3 mAh g−1 at 1st cycle and 109.8 mAh g−1 at 50th cycle. It demonstrated promising potential as an anode material in lithium-ion batteries with excellent discharge capacity and high rate cycling performance. © 2015 Springer-Verlag Berlin Heidelberg Source

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