Zn/ZnS锂离子电池负极材料的制备与性能  

Preparation and properties of Zn/ZnS anode materials for lithium-ion batteries

作　　者：刘秋伟 黄昊[1] 张贵锋[1] LIU Qiu-wei;HUANG Hao;ZHANG Gui-feng(School of Materials Science and Engineering,Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《电源技术》2020年第9期1250-1253,共4页Chinese Journal of Power Sources

基　　金：中央高校基本科研专项资金(DUT19LAB29);国家自然科学基金(51171033);国家重点研发计划(2016YFB0101206)。

摘　　要：将直流电弧法和硫化反应法结合起来制备了Zn/ZnS锂离子电池负极材料,通过调节硫化工艺参数控制Zn粒子的硫化程度、Zn/ZnS组成及ZnS物相,分析了Zn/ZnS负极材料的电化学性能。结果表明,ZnS的含量随温度升高而增加,在低温下ZnS为立方相,随硫化温度的升高,立方ZnS的相对量越来越少,最终全部转变为六方ZnS相。Zn/ZnS负极材料的循环性能随硫化温度的增加而先增加后降低,300℃时样品由Zn、立方ZnS以及少量六方ZnS组成,表现出了最好的循环性能,在500 mA/g的充放电电流密度下,300次循环后其比容量仍为232.1 mAh/g。电化学阻抗谱测试表明,相比于六方ZnS,立方ZnS具有更好的锂离子传导能力。Zn/ZnS anode materials for lithium-ion battery were prepared by combining DC-arc method and vulcanization reaction.The composition and phase of the anode materials could be controlled through vulcanization parameters.The ZnS content was positively related to vulcanization temperature.With the increase of sulfurization temperature,crystal structure of ZnS gradually transformed from cubic into hexagonal phase.The results of electrochemical performance measurements show that the cycling properties of the Zn/ZnS anode materials increase first and then decrease when the vulcanization temperature increases and achieve the best at 300℃,this sample is composed of Zn,cubic ZnS and a small amount of hexagonal ZnS and its specific capacity still maintains 232.1 mAh/g even at 500 mA/g charge-discharge current density after 300 cycles.The results of EIS show that cubic ZnS has a better lithium-ion conductivity than hexagonal ZnS.

关 键 词：锂离子电池 负极材料 硫化锌 循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]