高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (3): 481-488.doi: 10.7503/cjcu20180652

• 物理化学 • 上一篇    下一篇

锡酸钾对流动锌酸钾碱液中锌沉积/溶解的影响

姚寿广1(), 陈勇1,2, 程杰2,3, 申亚举2,3, 丁大培1, 杨裕生2,3   

  1. 1. 江苏科技大学能源与动力学院, 镇江 212003
    2. 张家港智电芳华蓄电研究所, 苏州 215600
    3. 浙江裕源储能科技有限公司, 长兴 313100
  • 收稿日期:2019-09-26 出版日期:2019-01-24 发布日期:2019-01-24
  • 作者简介:

    联系人简介: 姚寿广, 男, 博士, 教授, 主要从事液流电池及其系统应用研究. E-mail: zjyaosg@126.com

  • 基金资助:
    国家自然科学基金(批准号: 51776092)资助.

Effect of Potassium Stannate on the Deposition/Dissolution Behavior of Zinc Anode for Zinc-nickel Single-flow Battery

YAO Shouguang1,*(), CHEN Yong1,2, CHENG Jie2,3, SHEN Yaju2,3, DING Dapei1, YANG Yusheng2,3   

  1. 1. School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    2. Zhangjiagang Smart Grid Fanghua Electrical Energy Storage Research Institute, Suzhou 215600, China
    3. Zhejiang Yuyuan Energy Storage Technology Co., Ltd., Changxing 313100, China
  • Received:2019-09-26 Online:2019-01-24 Published:2019-01-24
  • Contact: YAO Shouguang E-mail:zjyaosg@126.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.51776092).

摘要:

研究了在流动的高浓度锌酸钾溶液中锡酸钾添加剂对锌负极沉积/溶解行为的影响. 循环伏安测试结果表明, 扫描速度为1 mV/s时, 随着添加锡酸钾浓度的增加, 阴极分支更早出现沉积, 溶解峰的峰值逐渐减小; 随着扫描速度的增加, 这种规律变得不明显. 利用SEM观测电沉积500 s的沉积物形貌发现, 向基础溶液中添加锡酸钾有利于晶种的产生和晶粒的生长. EDS测试结果表明含锡酸钾的锌酸钾溶液中沉积层含有锌和锡. 自放电测试结果表明, 基础电解液加入锡酸钾后自放电现象得到了明显的改善, 充满电静置12 h后加入0.1 mol/L锡酸钾的电池放电库仑效率从基础溶液的60.0%提高到81.1%.

关键词: 锡离子, 锌镍单液流电池, 荷电保持

Abstract:

The effect of potassium stannate additive on the deposition/dissolution behavior of zinc anode in flowing high concentration potassium zincate solution was studied. Cyclic voltammetry results show that when the scanning speed is 1 mV/s, the cathode branch deposits earlier with the increase of potassium stannate concentration, that is, the co-deposition of tin and zinc leads to the gradual decrease of dissolution peak with the increase of potassium stannate concentration. With the increase of scanning speed, the law becomes less obvious. SEM analysis shows that the addition of potassium stannate to the base solution is beneficial to seed production and grain growth. EDS tests show that the deposit from potassium stannate solution containing potassium stannate do contain zinc and tin. The self-discharge test shows that the self-discharge phenomenon is improved obviously after adding potassium stannate to the basic electrolyte. The Coulomb efficiency of the battery with 0.1 mol/L potassium stannate is increased from 60.0% of the basic solution to 81.1% after 12 h static charge. Therefore, the addition of potassium stannate in high concentration potassium zincate solution can benefit the production of seed and the growth of grain, produce compact small grains, make the deposit surface smoother and more compact, slow down the self-dissolution of zinc to a certain extent, and thus inhibiting the self-discharge effect.

Key words: Stannum ion, Zinc-nickel single flow battery, Charge retention

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