碳包覆硒化锌用作高性能锂离子电池负极材料  

Carbon-Coated ZnSe Nanoparticles for High-Performance Lithium-Ions Bat⁃tery Anode

作　　者：欧镇滔 罗刚 冯小勇 郭子依 李建伟 秦伟 OU Zhentao;LUO Gang;FENG Xiaoyong;GUO Ziyi;LI Jianwei;QIN Wei(College of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410114,China;School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,China)

机构地区：[1]长沙理工大学材料科学与工程学院,湖南长沙410114 [2]江苏师范大学物理与电子工程学院,江苏徐州221116

出　　处：《铜业工程》2024年第1期81-89,共9页Copper Engineering

基　　金：湖南省自然科学基金项目(2023JJ30034)资助。

摘　　要：石墨是当前锂离子电池的主流商用电极材料,然而受限于电化学储锂机理原因,其理论比容量偏低。因此,寻找高比容量负极材料的课题受到研究人员的广泛关注。本文以蔗糖为碳源,使用水热法制备了碳包覆ZnSe,并探究了其作为锂离子电池负极材料的电化学性能。使用扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及X射线衍射(XRD)等系统研究了材料的形貌、结构和组分等。结果表明,碳材料的引入,并未改变ZnSe的晶体结构。为了探究其电化学储锂特性,以金属Li作为对电极组装了锂离子电池半电池,并利用循环伏安法、恒流充放电等方法对其性能进行了评估。结果表明,相比目前常用的聚偏二氟乙烯(PVDF)黏结剂,使用羧甲基纤维素钠(CMC)作黏结剂,碳包覆ZnSe样品表现出更为优异的循环稳定性和更高的比容量。此外,相比纯ZnSe,碳包覆之后其锂离子电池储能特性得到了极大提升,在0.1A/g电流密度下,经过50次循环,在最优碳包覆含量下,其比容量由228.8 mAh/g提升至545.0 mAh/g;即使在1 A/g电流密度下循环500圈,其比容量依旧保持在500 mAh/g以上。As the commercial used anode material of lithium-ion batteries(LIBs),the graphite can't meet the growing demand of highdensity requirement owing to the intrinsic lithium storage mechanisms.Seeking for anode materials with high specific capacities is of current interest.Herein,ZnSe was prepared carbon coated via a one-step hydrothermal method and investigated their lithium-ion storage performances.Their morphology,structure and compositions were systematically characterized by field-emission scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),Raman spectroscopy,and it was found that the introduction of carbon did not change the crystal structure of ZnSe.Afterwards,the lithium-ion half cells were assembled using metal Li as counter electrode and their electrochemical performances were evaluated with cyclic voltammogram and galvanostatic charge/discharge method,respectively,and it was found that when used as anode of LIBs,the electrochemical performances could be improved significantly.Compared with pure ZnSe,the specific capacity of ZnSe with optimized carbon coating increased from 228.8 to 545.0 mAh/g at current density of 0.1 A/g after 50 cycles.Even cycled at a high current density of 1 A/g after 500 cycles,the specific capacity remained above 500 mAh/g.

关 键 词：硒化锌 碳包覆 锂离子电池 负极 水热法 

分 类 号：TQ152[化学工程—电化学工业]