锂离子电池负极材料ZnSnO_(3)/C复合物的制备与性能  

Synthesis and performance of ZnSnO_(3)/C composites as anode for lithium-ion battery

作　　者：岳红伟 邢若冰 耿壮壮 铁伟伟[1] 朱聪旭[1] 谢文合 陈淑君 YUE Hongwei;XING Ruobing;GENG Zhuangzhuang;TIE Weiwei;ZHU Congxu;XIE Wenhe;CHEN Shujun(College of Chemical and Materials Engineering,Xuchang University,Xuchang 461000,China;College of Physics and Electronic Engineering,Xinyang Normal University,Xinyang 464000,China)

机构地区：[1]许昌学院化工与材料学院,许昌461000 [2]信阳师范学院物理电子工程学院,信阳464000

出　　处：《工程科学学报》2024年第1期81-88,共8页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(11804289);河南省科技厅项目(232102230017);河南省教育厅项目(22B430028);许昌学院科研项目(2022ZD006);河南省大学生创新创业训练项目(202210180045)。

摘　　要：锡基双金属氧化物作为锂离子电池负极材料因具有高的理论比容量、嵌脱锂电位适中、储量丰富、价格低廉、安全性高以及环保等优点,已经受到了广泛的关注.本研究采用一步原位水热法制备了碳包覆的ZnSnO_(3)复合材料(ZnSnO_(3)/C).利用扫描电子显微镜、透射电子显微镜、X射线衍射、拉曼光谱、X射线光电子能谱分析和恒流充放电测试等一系列表征测试方法对材料的微观形貌、物相组成、结构和电化学性能进行分析.电化学测试结果表明:当作为锂离子电池负极材料时,ZnSnO_(3)/C复合电极的储锂性能优于纯ZnSnO_(3)电极.在200 mA·g^(-1)电流密度下,ZnSnO_(3)/C复合电极经200次循环后可逆容量可达1274.9 mA·h·g^(-1),即使在大电流5000 mA·g^(-1)下经500次循环仍然提供663.2 mA·h·g^(-1)的放电比容量,同时也表现出卓越的倍率性能.优异的储量性能归因于ZnSnO_(3)/C复合材料中具有高电导率的C不仅提高了整个电极的导电性,有利于电子的传输,而且增大了电解液与活性材料之间的接触面积,缩短了锂离子的扩散距离;同时碳包覆层可有效缓冲ZnSnO_(3)在嵌脱锂过程中由于体积变化产生的应力,也能在一定程度上抑制ZnSnO_(3)在循环过程中的团聚.Being one of the ternary metal oxides,different zinc stannate(ZnSnO_(3))nanostructures,including nanoparticles,nanowires,nanocubes,and nanosheets,have been synthesized and investigated for various applications,such as catalysts,phonics,sensors,piezoelectric,pyroelectric,and lithium-ion batteries(LIBs).The ZnSnO_(3)has received immense attention as potential anode materials for LIBs due to their high theoretical specific capacity,moderate intercalation and delithiation potential,abundant reserves,low cost,high safety,and environmental protection.In this study,a carbon-coated ZnSnO_(3)composite(ZnSnO_(3)/C)was prepared using a onestep in situ hydrothermal method with glucose as a carbon source.The microscopic morphology of the as-prepared materials was observed using scanning electron microscopy and transmission electron microscopy.X-ray diffraction,Raman spectra,and X-ray photoelectron spectroscopy were used to analyze the phase composition and structure of the composite.The electrochemical properties were investigated through constant charge-discharge tests,cyclic voltammetry,and electrochemical impedance spectroscopy.When used as anode materials of LIBs,the prepared ZnSnO_(3)/C composite electrode exhibited excellent lithium storage performance with an improved cycling performance and high capacities.A specific capacity value of 1274.9 mA·h·g^(-1)for ZnSnO_(3)/C composite is much higher than that of pure ZnSnO_(3)electrode(491 mA·h·g^(-1))after 200 cycles at a current density of 200 mA·g^(-1).The ZnSnO_(3)/C electrode retained a discharge capacity of 663.2 mA·h·g^(-1)even after 500 cycles at a high current density of 5000 mA·g^(-1),exhibiting excellent rate capability.Such remarkable electrochemical properties of the ZnSnO_(3)/C composite are preferable to those of complex and costly ZnSnO_(3)-based composites reported previously.The superior lithium storage performance of the ZnSnO_(3)/C composite is attributed to the synergistic effect between the carbon coating on the surface and ZnSnO_(3)nanoparticle

关 键 词：锡酸锌 碳 复合材料 负极 锂离子电池 

分 类 号：TQ174[化学工程—陶瓷工业] TQ152[化学工程—硅酸盐工业]