铬掺杂a-MnO_2的制备及其在锌离子电池中的性能

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英文篇名：Preparation of Cr-doping nanosized a-MnO_2 and its electrochemical performance in zinc ion battery 作者：肖酉 ; 李振 ; 赵芳霞 ; 史竞成 ; 张振忠 英文作者：XIAO You;LI Zhen;ZHAO Fang-xia;SHI Jing-cheng;ZHANG Zhen-zhong;School of Materials Science and Engineering,Nanjing Tech University; 关键词：纳米a-MnO2 ; 铬掺杂 ; 水热法 ; 锌离子电池 ; 电化学性能 英文关键词：nano a-MnO2;;Cr-doping;;hydrothermal method;;zinc ion battery;;electrochemical performance 中文刊名：DYJS 英文刊名：Chinese Journal of Power Sources 机构：南京工业大学材料科学与工程学院; 出版日期：2018-10-20 出版单位：电源技术 年：2018 期：v.42;No.337 基金：江苏高校优势学科建设工程项目(苏政办发2011-6);; 广西科技成果转化与推广计划项目(1298009-15) 语种：中文; 页：DYJS201810027 页数：3 CN：10 ISSN：12-1126/TM 分类号：90-92

摘要

以KMnO_4、MnSO_4·H_2O和K_2Cr_2O_7为原料,采用水热法制备了锌离子电池正极用铬掺杂型纳米a-MnO_2材料。借助XRD、TEM和恒流充放电测试等手段研究了反应时间和Cr掺杂量对MnO_2粉体的晶型结构和形貌及其在模拟锌离子电池中的放电比容量和循环性能的影响。结果表明:所制备的粉体为结晶性良好的纳米棒状a-MnO_2;Cr的掺杂不会明显改变MnO_2的晶体结构,Cr掺杂型纳米a-MnO_2所制备的电池初始放电比容量可达257 mAh/g,与未掺杂的a-MnO_2相比提高了27.9%,10个循环后的容量保持率提高21.8%。推荐性能最佳铬掺杂纳米a-MnO_2的水热法制备工艺参数为:在160℃下,KMnO_4与MnSO_4的摩尔比为2∶3,水热法反应4 h,K_2Cr_2O_7的掺杂量为10%(质量分数)KMnO_4。
        KMnO_4, MnSO_4·H_2O and K_2Cr_2O_7 were used to obtain chromium doped nanosized a-MnO_2 used in zinc ion battery under the hydrothermal method. XRD, TEM and galvanostatic charge-discharge tests were carried out to investigate the effect of reaction time and Cr doping amount on the morphology and structure of the crystalline powders, discharge capacity and cycle performance of the simulated zinc ion batteries. The results indicate that the as-prepared powders are some nano-rods with good crystallinity. The crystal structure isn ' t significantly changed by the Cr doping of the a-MnO_2. The initial discharge capacity of the battery prepared by Cr doped nano a-MnO_2 can reach 257 mAh/g, which is 27.9% higher than that of undoped a-MnO_2. The capacities retention after 10 cycles increase 21.8%. The process parameters of best performance of Cr-doping a-MnO_2 is proposed for under 160 ℃,the molar ratio of KMnO_4 to MnSO_4 is 2∶3 and 4 h with 10% KMnO_4 of K_2Cr_2O_7 by hydrothermal preparation.

引文

[1] XU C, LI B, DU H, et al. Energetic zinc ion chemistry:The rechargeable zinc ion battery[J]. Angewandte Chemie, 2012, 51(4):933-935.
    [2]郑宇亭,郝晓剑,潘保武.水热-离子交换法制备m-LiMnO2及工艺优化[J].电源技术,2016,40(3):507-509,513.
    [3]赵明,王晓芳,高娇阳,等. Cr掺杂二氧化锰纳米棒的制备及其电化学性能[J].电源技术,2012,36(9):1313-1315.
    [4]刘不厌.纳米二氧化锰的制备、改性及其电化学性质[D].大连:大连理工大学,2011.
    [5]周巧,李学良,尤亚华,等.铬掺杂锰酸锂的正极材料离子热法制备及其性能[J].无机盐工业,2015(4):62-64.
    [6]杨敬东.二次锌离子电池的制备及其性能研究[D].南京:南京工业大学,2014.
    [7]钟盛文,金柱,梅文捷,等.高容量锂离子正极材料LiNi0.5Co0.3-Mn0.2O2的制备与性能[J].电源技术,2016,40(1):24-27.
    [8] STEINBERGER R, DUCHOSLAV J, GREUNZ T, et al. Investigation of the chemical stability of different Cr(VI)based compounds during regular X-ray photoelectron spectroscopy measurements[J].Corrosion Science, 2015(90):562-571.
    [9]贠超凡,张国恒,王旺,等.层状Mo O2/石墨烯复合材料制备及其电化学性能[J].电源技术,2016,40(2):263-266.
    [10] LI X L, LI W J, CHEN X Y, et al. Hydrothermal synthesis and characterization of orchid-like Mn O2nanostructures[J]. Journal of Crystal Growth, 2006(297):387-389.