CNTs含量对SnO2-MnSn(OH)6/CNTs锂离子电池负极材料性能的影响  

Influences of CNTs content on properties of SnO2-MnSn(OH)6/CNTs anode for lithium ion batteries

作　　者：何声太[1,2] 曾林海 陈媛 HE Sheng-tai;ZENG Lin-hai;CHEN Yuan(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Key Laboratory of Advanced Fibers and Energy Storage,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387 [2]天津工业大学天津市先进纤维与储能技术重点实验室,天津300387

出　　处：《天津工业大学学报》2020年第6期47-52,共6页Journal of Tiangong University

基　　金：国家重大科学研究计划项目(2012CB933301)。

摘　　要：为了改善锡基负极材料的电化学性能,以SnCl4·5H2O和MnC4H6O4·4H2O为前驱体通过水热法一步合成MnSn(OH)6/CNTs纳米复合材料,并使用XRD、SEM、电化学工作站和蓝电测试系统来对复合材料的结构和性能进行表征、测试。结果显示:碳纳米管(CNTs)的加入能够有效改善SnO2-MnSn(OH)6的电化学性能;所有复合材料中,SnO2-MnSn(OH)6/CNTs15性能最佳,在200 mA/g的电流密度下SnO2-MnSn(OH)6/CNTs15首圈放电比容量为2632.2 mA·h/g,首次库伦效率为56.1%,150圈之后比容量仍保持在565 mA·h/g,且其倍率性能也比其他材料优异,在1A/g的电流密度下,平均放电比容量仍然有512.6 mA·h/g。In order to improve the electrochemical performance of tin-based anode materials,SnO2-MnSn(OH)6/CNTs nanocomposites were synthesized by hydrothermal method using SnCl4·5H2O and MnC4H6O4·4H2O as precursors.Then XRD,SEM,electrochemical workstation and LAND battery test system were used to characteize the structure and electrochemical performances of the composite.The results show that the addition of CNTs can effectively improve the electrochemical performance of SnO2-MnSn(OH)6,and the SnO2-MnSn(OH)6/CNTs15 demo-nstrates the best performance in all composites.At the current density of 200 mA/g,the specific capacity of SnO2-MnSn(OH)6/CNTs15 in the first cycle is 2632.2 mA·h/g,the first Coulombic efficiency is 56.1%.And the discharge specific capacity keeps 565 mA·h/g after 150 cycles.What′s more,the rate performance of SnO2-MnSn(OH)6/CNTs15 is also superior to that of other materials.Even at the current density of 1 A/g,the average discharge capacity of SnO2-MnSn(OH)6/CNTs15 is still 512.6 mA·h/g.

关 键 词：锂离子电池 SNO2 MnSn(OH)6 CNTS 负极材料 

分 类 号：TQ152[化学工程—电化学工业]