Entity

Time filter

Source Type


Su J.,Guangxi University | Su J.,Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology | Liu Z.-Z.,Guangxi University | Long Y.-F.,Guangxi University | And 6 more authors.
Electrochimica Acta | Year: 2015

An LiMnPO4/C composite material with ordered olivine structure was synthesized by a microwave-assisted solvothermal process in 2:5 (v/v) water-diethylene glycol mixed solvents at 190 °C for 5 min. The sample was characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, charge/discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy. The prepared LiMnPO4/C particles exhibited an irregular flaky form coated with a uniform carbon layer (approximately 2-3 nm thick). The prepared LiMnPO4/C composite exhibited a discharge capacity of 131.4 and 85.2 mAh·g-1 at 0.1C and 5C, respectively. It delivered a discharge capacity of 109.2 mAh·g-1 with a capacity retention ratio of approximately 99% after 50 cycles at 1C. Furthermore, this microwave-assisted solvothermal approach led to a significant decrease in the reaction time as compared to conventional hydrothermal/ solvothermal processes. © 2015 Elsevier Ltd. All rights reserved.


Li Y.-N.,Guangxi University | Su J.,Guangxi University | Su J.,Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology | Lv X.-Y.,Guangxi University | And 5 more authors.
Electrochimica Acta | Year: 2015

Porous anatase TiO2 samples have been prepared by a bio-template route using low-cost yeast cells as templates. The structure, morphology and electrochemical performance of the prepared samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) analysis, galvanostatic charge/discharge tests and cyclic voltammograms (CV). The results showed that the prepared samples have a hierarchical porous structure replicated from the microstructure of yeast template, which combines macropores (1.5-2.5 μm) and thin pore wall (0.2-0.7 μm) composed by mesopore (9.78 nm) and 10-20 nm active material. The prepared porous TiO2 delivered a discharge capacity of about 255.98 mAh g-1 and its capacity retention was about 80% after 100 cycles at 1/3C. Remarkably, it still showed a high discharge capacity of 112.93 and 84.65 mAh g-1 even at 5 and 10C, respectively. The good rate performance can be ascribed to the hierarchical porous structure, which provided good access of the electrolyte to the electrode interface, reducing path lengths for ion diffusion and accommodating volume changes during cycling. © 2015 Elsevier Ltd. All rights reserved.

Discover hidden collaborations