2009/05/08 13:52
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双恒电位仪Bistat和旋转盘环电极RRDE最佳配置
进行燃料电池催化剂研究的仪器配置方案,荷兰IVIUM双恒电位仪Vertex.C.EIS和旋转还盘电极装置IVI.RRDE
能源/新能源
2020/06/11
Nanoparticle–Nanorod Core–Shell LiNi0.5Mn1.5O4 Spinel Cathodes with High Energy Density for Li-Ion Batteries
研究领域:锂离子电池电极材料 交流阻抗频率范围:500kHz - 0.01Hz Nanoparticle–nanorod core–shell LiNi0.5Mn1.5O4 spinel cathodes for Li-ion batteries were prepared using a hollow MnO2 precursor. The core and shell parts consisted of nanoparticle 100 nm and nanorod assemblies, respectively. The core–shell cathode exhibited greatly improved discharge capacities compared to nanoparticles prepared by a sol–gel method. The core–shell spinel exhibited discharge capacities of 121 and 100 mAh/g at 0.1C and 7C rates, respectively, whereas a spinel cathode prepared by a sol–gel method exhibited 99 and 80 mAh/g at those respective rates. In addition, the core–shell spinels demonstrated an energy density value that was enhanced by 52% to 1.6 Wh/cm3 compared to an analogous sample prepared by a sol–gel method, which showed a value of 0.9 Wh/cm3.
2014/01/06
Electrochemical Titanium Diboride TiB2 Synthesis from Fluoride Melts
Electrochemical Titanium Diboride TiB2 Synthesis from Fluoride Melts 研究领域:熔盐电解质 测量方法:循环伏安
2014/01/06
Significant Improvement of LiNi0.8Co0.15Al0.05O2 Cathodes at 60°C by SiO2 Dry Coating for Li-Ion Batteries
研究领域:锂离子电池电极材料 交流阻抗频率范围:5000Hz - 0.1Hz The cycling performance of a LiNi0.8Co0.15Al0.05O2 cathode at 60°C was substantially improved by direct SiO2 dry coating. The SiO2-coated cathode was obtained from firing of the mixture consisting of SiO2 nanoparticles and the cathode powders with a weight ratio of 99:1 at 700°C for 5 h. The first discharge capacity of the coated cathode was 172 mAh/g, whereas the uncoated one showed 182 mAh/g at 60°C. However, the coulombic efficiency of the coated sample was 95%, which was 2% higher than that of the uncoated sample. Moreover, the discharge capacities of the coated cathode at 60°C was about 2.5 times larger than those of the uncoated sample at rates of 0.5 and 1C, showing 146 and 109 mA/g, respectively. This capacity improvement at 60°C is related to the fact that the highly distributed Si element near the surface, as a type of solid solution with LiNi0.8Co0.15Al0.05O2, diminishes the side reactions of the cathode and electrolyte at 60°C.
2014/01/06