无机材料学报 ›› 2020, Vol. 35 ›› Issue (8): 909-915.DOI: 10.15541/jim20190473

所属专题: 能源材料论文精选(二):超级电容器与储能电池(2020) 【虚拟专辑】锂金属电池,钠离子电池和水系电池(2020~2021)

• 研究论文 • 上一篇    下一篇

一种用于长寿命水系锌锰电池的海藻酸钠/二氧化硅准凝胶复合电解质

李雪渊1,2(),王宏刚1,3,田柱1,朱建辉2,刘影2,贾兰1,尤东江2,李向明2,康利涛2()   

  1. 1.太原理工大学 材料科学与工程学院, 太原 030024
    2.烟台大学 环境与材料工程学院, 烟台 264005
    3.潍柴动力股份有限公司, 潍坊 261001
  • 收稿日期:2019-09-16 修回日期:2019-11-21 出版日期:2020-08-20 网络出版日期:2019-12-29
  • 作者简介:李雪渊(1993–), 男, 硕士研究生. E-mail: 343610098@qq.com
    LI Xueyuan(1993–), male, Master candidate. E-mail: 343610098@qq.com
  • 基金资助:
    国家自然科学基金(51502194);国家自然科学基金(21606191);山东省重大基础研究计划(ZR2018ZC1459);烟台市自然科学基金(2019XDHZ87)

A Quasi-gel SiO2/Sodium Alginate (SA) Composite Electrolyte for Long-life Zinc-manganese Aqueous Batteries

LI Xueyuan1,2(),WANG Honggang1,3,TIAN Zhu1,ZHU Jianhui2,LIU Ying2,JIA Lan1,YOU Dongjiang2,LI Xiangming2,KANG Litao2()   

  1. 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    2. School of Environmental and Material Engineering, Yantai University, Yantai 264005, China
    3. Weichai Power Co., Ltd., Weifang 261001, China
  • Received:2019-09-16 Revised:2019-11-21 Published:2020-08-20 Online:2019-12-29
  • Supported by:
    National Natural Science Foundation of China(51502194);National Natural Science Foundation of China(21606191);Major Basic Research Plan of Shandong Province(ZR2018ZC1459);Yantai Natural Science Foundation(2019XDHZ87)

摘要:

锌锰(Zn-MnO2)电池具有高安全性、高环保性、高性价比的优点, 适用于大规模储能电池。然而, 金属锌负极在充放电中会因为“尖端效应”而产生锌枝晶, 造成电池容量衰减甚至短路失效。本研究通过添加亲水性纳米二氧化硅(SiO2)和海藻酸钠(SA)将电解质转化为准凝胶电解质, 有效抑制了锌负极表面的枝晶生长, 以及由之造成的Zn-MnO2电池性能衰减。恒流充放电测试结果表明, 采用准凝胶电解质的Zn-MnO2电池在1800次循环后容量保留率可达78%, 而使用普通电解质的Zn-MnO2电池在1000次循环后容量已基本衰减为0。进一步探究准凝胶电解质对锌沉积行为的影响, 发现准凝胶电解质的三维网络结构可以提高锌离子分布的均匀性, 降低电池容量衰减速度与失效风险。

关键词: 锌锰电池, 锌枝晶, 准凝胶电解质, 海藻酸钠, 二氧化硅

Abstract:

Zinc-manganese (Zn/MnO2) batteries with outstanding advantages of high operation safety, high environmental benignity and high cost performance, is suitable for the application of large-scale energy storage battery. However, the uncontrolled growth of zinc dendrites on the metal zinc anode during charge-discharge cycling causes serious problems such as quick capacity decrease and short circuit failure. In this study, the aqueous electrolyte was converted into a composite quasi-gel electrolyte by adding hydrophilic nano-silica (SiO2) and sodium alginate (SA), which effectively inhibits the dendrite growth of the surface of the zinc negative electrode and the capacity degradation of the Zn-MnO2 battery. Galvanostatic charge-discharge tests showed that the Zn/MnO2 battery with composite gel electrolyte achieves a capacity retention of 78% after 1800 cycles, while the capacity of Zn/MnO2 battery using ordinary electrolyte almost fails after 1000 cycles. The three-dimensional network structure of the gel electrolyte can improve the distribution uniformity of zinc ion in electrolyte, reduce the capacity decay rate and failure risk of the batteries.

Key words: zinc-manganese battery, zinc dendrite, quasi-gel electrolyte, sodium alginate, silica

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