对苯二甲酸添加剂对锌离子电池γ-MnO2正极的影响  

Study on effects of terephthalic acid additives on γ-MnO2 cathode for zinc-ion batteries

作　　者：蒲雪超 徐成俊 黄旭东 刘文宝 康飞宇[1,2] PU Xue-chao;XU Cheng-jun;HUANG Xu-dong;LIU Wen-bao;KANG Fei-yu(International Graduate School at Shenzhen,Tsinghua University,Shenzhen Guangdong 518055,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学深圳国际研究生院,广东深圳518055 [2]清华大学材料科学与工程学院,北京100084

出　　处：《电源技术》2020年第8期1112-1115,1176,共5页Chinese Journal of Power Sources

基　　金：科技部国际合作项目(2016YFE0102200);深圳市学科布局项目(JCYJ20160301154114273);国家重点基础研究发展计划(2014CB932400)。

摘　　要：以对苯二甲酸(H2BDC)作为锌离子电池正极安全添加剂,在γ-MnO2正极材料中分别掺入了质量分数为5%、10%、20%三种不同配比的H2BDC添加剂。通过CV测试和恒流充放电测试,研究了三种不同质量配比的添加剂对电池电化学性能的影响。结果表明添加10%(质量分数)的H2BDC电池循环性能最佳。通过SEM、XRD和原位pH测试等手段进一步研究了添加剂的作用机制,结果表明H2BDC添加剂能缓冲放电过程中电解液pH的剧烈升高,抑制电极表面碱式硫酸锌杂质的产生,使电池展现出优异的循环稳定性。Terephthalic acid(H2BDC) was used as cathode safety additives in zinc-ion battery.H2BDC additives with mass ratio of 5%,10% and 20% were added into γ-MnO2 cathode material,respectively.The effects of different mass ratio additives on the electrochemical performance of the battery were carefully studied by CV test and galvanostatic charge-discharge techniques.The results show that H2BDC additives with 10% mass ratio exhibit the best cycle performance.SEM,XRD and in-situ pH test were carried out to investigate the mechanism of H2BDC additives.The results confirm that H2BDC can release the sharp increase of pH in electrolyte during the discharge process and inhibit the generation of basic zinc sulfate impurities on the electrode surface.Therefore,zinc-ion battery with excellent cycle stability is realized.

关 键 词：锌离子电池 γ-MnO2正极 添加剂 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]