不同晶型MnO2超级电容器电极材料的电化学特性
Electrochemical Properties of Supercapacitor Electrode Materials Prepared by MnO2 with Different Crystal Forms
摘 要
用不同晶型的MnO2粉体制备了β-MnO2和γ-MnO2电极, 用循环伏安和恒流充放电试验研究了上述两种电极的电化学特性。结果表明: β-MnO2和γ-MnO2电极都具有良好的电容性能, 但后者具有更为良好的倍率放电性能, 适合大电流充放电; 在300 mA·g-1的电流密度下, 经5 000个循环充放电之后, β-MnO2电极已失效, 而γ-MnO2电极的容量保持率还高达89.2%。
MnO2
电化学特性
电极
supercapacitor
manganese dioxide
electrochemical property
electrode
Abstract
The β-typed and γ-typed electrodes were prepared by MnO2 powders with different crystal forms, and the electrochemical properties of the above-mentioned electrodes were studied by cyclic voltammetry method and constant-current charge and discharge test. The results show that both the β-typed and γ-typed electrodes had good capacitance property, and the γ-MnO2 electrode had better rate discharge property and was more suitable for charge-discharge of larger current. Under the condition of the current density of 300 mA·g-1, the β-MnO2 electrode became invalid but the capacitance retention of γ-MnO2 electrode was still as high as 89.2% after circulatory charge-discharge 5 000 cycles.
中图分类号 TG146.1
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(50901041); 航空基金资助项目(2009ZF56017); 江西省自然科学基金资助项目(2010GQH0114)
收稿日期 2011/3/24
修改稿日期 2011/12/26
网络出版日期
作者单位点击查看
备注黄廷立(1986-), 男, 浙江兰溪人, 硕士研究生。
引用该论文: HUANG Ting-li,YE Zhi-guo,PENG Xin-yuan,HU Sheng-shuang,HUA Xiao-zhen,ZHOU Xian-liang,YUAN Xue-tao. Electrochemical Properties of Supercapacitor Electrode Materials Prepared by MnO2 with Different Crystal Forms[J]. Materials for mechancial engineering, 2012, 36(4): 67～70
黄廷立,叶志国,彭新元,胡生双,华小珍,周贤良,袁学滔. 不同晶型MnO2超级电容器电极材料的电化学特性[J]. 机械工程材料, 2012, 36(4): 67～70
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【3】江奇, 瞿美臻, 张伯兰, 等.电化学超级电容器电极材料的研究进展[J].无机材料学报, 2002, 17(4): 649-656.
【4】WU M Q, GRAEME A S. Redox deposition of manganese oxide on graphite for supercapacitors[J].Electrochem Commun, 2004, 6(5): 499-504.
【5】夏熙.二氧化锰及相关锰氧化物的晶体结构、制备及放电性能(1)[J].电池, 2004, 34(6): 411-414.
【6】THACKERAY M M. Manganese oxides for lithium batteries[J].Progress in Solid State Chemistry, 1997, 25: 36-44.
【7】张治安, 杨邦朝, 邓梅根, 等.无定型氧化锰超级电容器电极材料[J].功能材料与器件学报, 2005, 11(1): 58-62.
【8】HU C C, TSOU T W. The optimization of specific capacitance of specific capacitance of amorphous manganese oxide for electrochemical supercapacitors using experimental strategies[J].Power Sources, 2003, 115: 179-186.
【9】JIANG Hao, ZHAO Ting, MA Jan, et al. Ultrafine manganese dioxide nanowire network for high-performance supercapacitors[J].Chemical Communications, 2011, 47: 1264-1266.
【10】KUO S L, WU N L. Investigation of pseudocapacitive charge-storage reaction of MnO2·nH2O supercapacitors in aqueous electrolytes[J].Journal of the Electrochemical Society, 2006, 153(7): A1317-A1324.
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