摘要
为了提高固态电解质的电化学性能,通过物理剥离法和水浴法制备了石墨烯(G)、Co_(3)O_(4)以及Co_(3)O_(4)/G复合材料,利用X射线衍射仪、扫描电镜对材料进行了表征与分析。通过化学方法制备了Co_(3)O_(4)固体电解质和Co_(3)O_(4)/G复合固态电解质,采用线性扫描伏安法、交流阻抗谱和计时电流法进行了电化学性能测试,分析了复合物中石墨烯含量对复合固态电解质性能的影响。结果表明:少量石墨烯的添加能够提高复合电解质的电化学性能,但随着掺加量的增加会导致石墨烯加剧团聚,导致电化学性能下降。当石墨烯的添加量为15%时,固态电解质具有最好的电化学性能,电化学稳定窗口为4.4 V,离子电导率达到8.11×10^(-4),锂离子迁移数达到0.468,组装为全固态电池后在室温条件下以0.1 C进行充放电测试,首次的充放电比容量为154.3 mA·h/g,室温下进行了50次循环后,放电比容量为149.28 mA·h/g,仅下降约2.95%,循环50次后容量保持率为97.05%。
This paper aims to improve the electrochemical performance of the solid electrolyte.The study is accomplished by preparing graphene(G),Co_(3)O_(4)and Co_(3)O_(4)/G composites materials by physical stripping method and water bath method respectively and characterizing and analyzing them by X-ray diffractometer and scanning electron mic roscopy;preparing Co_(3)O_(4)solid electrolyte and Co_(3)O_(4)/G composite solid electrolyte with chemical method and testing their electrochemical properties by linear sweep Voltammetry,alternating impedance spectroscopy and chronoamperometry of Chenhua electrochemical workstaiton;and analyzing the effect of graphene content of compound on the composite solid electrolyte performance.The results show that the addition of a small amount of G can improve the electrochemical performance of the composite electrolyte,but with the increase of the addition amount,G will intensify agglomeration,leading to a decrease in electrochemical performance.When the amount of G added is 15%,the solid electrolyte exhibits the best electrochemical performance,with an electrochemical stability window of 4.4 V,an ion conductivity of 8.11×10^(-4),and the lithium ion migration number of 0.468.After assembled as an all solid-state battery,by which conducts the charging and discharging test at 0.1 C at room temperature.The specific capacity of charge and discharge for the first time is 154.3 mA·h/g.After 16 cycles at room temperature,the specific capacity of discharge is 149.28 mA·h/g with only 2.95% decreased,and the capacity retention rate after 50 cycles is 97.05%.
作者
王振廷
李伟倩
尹吉勇
Wang Zhenting;Li Weiqian;Yin Jiyong(School of Materials Science&Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China)
出处
《黑龙江科技大学学报》
2025年第4期582-586,共5页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省省属高等学校基本科研业务费项目(2021-KYYWF-1460,2022-KYYWF-0528)。
作者简介
第一作者:王振廷(1965-),男,黑龙江省哈尔滨人,教授,博士,研究方向:石墨烯应用,E-mail:wangzt2002@163.com。
