Mn_(3)O_(4)/MnO@C复合材料的制备及储锂性能研究  

Preparations and lithium storage characteristics of Mn_(3)O_(4)/MnO@C composites

作　　者：刘渤 徐桂英[1] 王坤 张殿浩 张文武 吴松彬 周卫民[1] Liu Bo;Xu Guiying;Wang Kun;Zhang Dianhao;Zhang Wenwu;Wu Songbin;Zhou Weimin(Key Laboratory of Energy Materials and Electrochemistry Research of Liaoning Province,University of Science and Technology Liaoning,Anshan 114051;Haicheng Shenhe Technology Co.,Ltd.,Anshan 114200;School of Economics,Shenzhen Polytechnic,Shenzhen 518055)

机构地区：[1]辽宁科技大学,辽宁省能源材料与电化学重点实验室,鞍山114051 [2]海城申合科技有限公司,鞍山114200 [3]深圳职业技术学院经济学院,深圳518055

出　　处：《化工新型材料》2023年第9期118-123,共6页New Chemical Materials

基　　金：辽宁省教育厅项目(LJKQZ2021126);深圳职业技术学院校级重点课题(6021310001S);广东省“十三五”规划2020年度学科共建项目(GD20XLJ01);中国职业教育学会—新时代中国职业教育研究院2021年职业教育重大课题(SZ21B010)。

摘　　要：以煤焦油沥青为碳源,MnSO_(4)和KMnO_(4)为锰源,使用一步水热法合成了Mn_(3)O_(4)/MnO@C复合材料。通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱和热重分析仪表征方法,揭示了Mn_(3)O_(4)/MnO@C复合材料的形貌、晶体结构和化学组分。通过恒流充放电测试、循环伏安测试和交流阻抗测试分析了材料的储锂性能。结果表明:得益于稳定且快速导电网络的构筑,Mn_(3)O_(4)/MnO@C复合材料经过300次充放电循环后,放电比容量仍能达到700mAh/g,几乎是商业石墨比容量的2倍。Mn_(3)O_(4)/MnO@C composites were synthesized by a one-step hydrothermal method using coal tar pitch as the carbon source and MnSO_(4) and KMnO_(4) as the manganese sources.The morphologies,crystal structures and chemical components of the Mn_(3)O_(4)/MnO@C composites were characterized by scanning electron microscopy,X-ray diffractometer,X-ray photoelectron spectroscopy and thermogravimetric analyzer characterization methods.The Lithium storage capacities of the Mn_(3)O_(4)/MnO@C composites were analyzed by constant current charge/discharge,cyclic voltammetry and AC impedance tests.As a result,due to the construction of a stable and fast conducting network,the Mn_(3)O_(4)/MnO@C composite could still show a discharge specific capacity of 700mAh/g after 300 charge/discharge cycles,which was almost twice the specific capacity of commercial graphite.

关 键 词：锰氧化物 煤焦油沥青 水热法 锂离子电池 负极材料 

分 类 号：TM911[电气工程—电力电子与电力传动]