Corrosion Resistance and Discharge Performance of Mg-MnO2 Battery by Sodium Silicate Additive
首发时间:2018-05-17
Abstract:The corrosion resistance and delayed action are major obstacles severely limit the practical application of magnesium (Mg) alloy in battery fields. In this paper, the effects of sodium silicate (Na2SiO3) on electrochemical behavior of AZ31B Mg alloy are investigated in MgSO4-Mg(NO3)2 composite solution (0.14 mol L-1 MgSO4, 1.86 mol L-1 Mg(NO3)2). The electrochemical tests are carried out by using electrochemical impedance spectroscopy (EIS), galvanostatic discharge (GD) and linear sweep voltammograms (LSV). The results indicate that the impedance value increases nearly 4 times and the delayed time decreases from 2.1 s to 0.6 s. Furthermore, the battery performance test reveals that the addition of Na2SiO3 significantly improves the discharge specific capacity of Mg-MnO2. The surface morphology and composition of corrosion products from Mg alloys are studied by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The SEM images of AZ31B Mg alloys in composite solution with or without Na2SiO3 additive have an obvious distinction due to the formation of new insoluble compound. FT-IR result confirms that the corrosion products accumulated on the alloy surface in the electrolyte containing Na2SiO3 are mainly composed of magnesium hydroxide, magnesium carbonate and magnesium silicate.
keywords: Mg-MnO2 battery Sodium silicate Corrosion resistance Delayed action Discharge capacity
点击查看论文中文信息
硅酸钠添加于镁-锰电池电解液对其腐蚀防护及放电特性作用
摘要:耐腐蚀性能差和电位滞后作用是严重限制镁(Mg)合金在电池领域的应用的主要障碍。 本文用MgSO4-Mg(NO3)2复合电解液(0.14molL-1MgSO4,1.86molL-1mg(NO3)2), 考察了硅酸钠(Na2SiO3)对AZ31B镁合金电化学行为的影响。 电化学测试是通过电化学阻抗谱(EIS)、恒电流放电(Gd)和线性扫描伏安法(LSV)进行的。结果表明,阻抗值对比未添加硅酸钠时增加了近4倍,延迟时间从2.1s下降到0.6s,Na2SiO3的加入显著提高了Mg-MnO2的放电比容量。用扫描电镜(SEM)和傅立叶变换红外光谱(FT-IR)研究了镁合金表面形貌和腐蚀产物组成,在含或不含Na2SiO3添加剂的复合溶液中AZ31B镁合金的SEM图像由于前者生成了新的不溶性化合物而具有明显的区别。FT-IR结果表明,在含Na2SiO3电解液中,合金表面积累的腐蚀产物主要由氢氧化镁、碳酸镁和硅酸镁组成。
引用
No.****
动态公开评议
共计0人参与
勘误表
硅酸钠添加于镁-锰电池电解液对其腐蚀防护及放电特性作用
评论
全部评论0/1000