摘要
正极材料的穿梭效应和导电性能是限制锂硫电池发展与应用的重要因素。针对以上问题,采用水热法制备了Fe_(2)O_(3)/rGO载硫体,并与rGO和Fe_(2)O_(3)@rGO载硫体进行对比。利用X射线衍射仪、扫描电子显微镜、比表面积分析仪以及电化学性能测试等分析测试手段对材料的物相组成、微观结构以及电化学性能进行分析表征。结果表明:采用原位法制备的Fe_(2)O_(3)/rGO复合材料中Fe_(2)O_(3)颗粒尺寸明显比机械混合法制备的Fe_(2)O_(3)@rGO中的Fe_(2)O_(3)颗粒尺寸小,其中纳米Fe_(2)O_(3)的生成阻碍了rGO片层的聚集,增大了层间距,获得了更大的孔径(8 nm)、孔容积和比表面积。制备的正极材料Fe_(2)O_(3)/rGO/S具有更好的循环稳定性,在0.2C电流密度下,经过100次循环后,仍保留782 mA∙h/g的容量。电化学性能的提高得益于Fe_(2)O_(3)/rGO大的比表面积以及良好的阻抗性能。
The shuttle effect and electrical conductivity of lithium-sulfur battery cathode materials are important factors that limit the development and application of lithium-sulfur batteries.In response to the above problems,the Fe_(2)O_(3)/rGO sulfur-carrier was prepared by hydrothermal method,and rGO and Fe_(2)O_(3)@rGO sulfur-carriers were prepared for comparison.The phase composition,microstructure and electrochemical properties of the materials were characterized by means of X-ray diffractometer,scanning electron microscope,specific surface area analyzer and electrochemical performance test.The results show that the size of Fe_(2)O_(3) particles in Fe_(2)O_(3)/rGO composites prepared by in-situ method is significantly lower than that of Fe_(2)O_(3)@rGO prepared by mechanical mixing method.The formation of nano Fe_(2)O_(3) hinders the aggregation of rGO layers,increases the interlayer spacing and obtains larger pore size(8 nm),pore volume and specific surface area.The prepared cathode material of Fe_(2)O_(3)/rGO/S has better cycle stability at a current density of 0.2C.After 100 cycles,the remaining capacity is 782 mA∙h/g.The improvement of electrochemical performance is attributed to the large pore volume and good impedance performance of Fe_(2)O_(3)/rGO.
作者
董伟
赵美娜
梁冰
杨芳
沈丁
孟令强
李明伟
刘凤霞
杨绍斌
董亮
DONG Wei;ZHAO Mei-na;LIANG Bing;YANG Fang;SHEN Ding;MENG Ling-qiang;LI Ming-wei;LIU Feng-xia;YANG Shao-bin;DONG Liang(College of Material Science and Engineering,Liaoning Technical University,Fuxin 123000,China;School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;Institute of Mineral Material and Clean Transformation,Liaoning Technical University,Fuxin 123000,China;Dong Fang New Energy Corporation,State Power Investment Company,Shijiazhuang 050031,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2022年第7期2019-2026,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(21808095,51874167)
辽宁省教育厅基本科研项目面上项目(LJKZ0339,LN2019JL026)
辽宁工程技术大学学科创新团队资助项目(LNTU20TD-16,LNTU20TD-09)。
