论文部分内容阅读
为了提高La_(0.94)Mg_(0.06)Ni_(3.49)Co_(0.73)Mn_(0.12)Al_(0.20)合金的性能,研究了氟化处理对其电化学性能的影响。X射线衍射和扫描电镜分析表明:氟化处理后,合金的相组成发生改变,有新相Mg F2生成;合金的表面有一层Mg F2颗粒。电化学测试表明:当NH4F浓度为0.3 mol/L时,合金电极的最大放电容量(Cmax)从346.4 m Ah/g提高到378.0 m Ah/g,容量保持率(S50)从69.5%提高到74.3%,交换电流密度由122.3 m A/g提高到188.5 m A/g,极限电流密度由891.7 m A/g提高到1162.1 m A/g,腐蚀电位由-0.895 V提高到-0.849 V,电化学反应阻抗减小。
In order to improve the performance of the La_ (0.94) Mg_ (0.06) Ni_ (3.49) Co_ (0.73) Mn_ (0.12) Al_ (0.20) alloy, the effect of fluoridation on its electrochemical properties was studied. X-ray diffraction and scanning electron microscopy analysis showed that: after fluoridation, the phase composition of the alloy changed, a new phase Mg F2 generated; the surface of the alloy has a layer of Mg F2 particles. Electrochemical tests showed that the maximum discharge capacity (Cmax) of alloy electrode increased from 346.4 m Ah / g to 378.0 m Ah / g when NH4F concentration was 0.3 mol / L, and the capacity retention (S50) increased from 69.5% to 74.3 %, The exchange current density increased from 122.3 m A / g to 188.5 m A / g, the ultimate current density increased from 891.7 m A / g to 1162.1 m A / g, the corrosion potential increased from -0.895 V to -0.849 V, The reaction impedance decreases.