V_(2)O_(5)/Ca_(x)V_(2)O_(5)复合材料的合成及其电化学性能研究  

Synthesis and electrochemical properties of V_(2)O_(5)/Ca_(x)V_(2)O_(5)composites

作　　者：彭良奎 陈泓友 袁伊帆 张锦程 程璐 周惠敏[1] Peng Liangkui;Chen Hongyou;Yuan Yifan;Zhang Jincheng;Cheng Lu;Zhou Huimin(College of Textile and Clothing,Xinjiang University,Urumqi 830017)

机构地区：[1]新疆大学纺织与服装学院,乌鲁木齐830017

出　　处：《化工新型材料》2024年第12期164-169,共6页New Chemical Materials

基　　金：天山青年计划项目(2020Q073);新疆维吾尔自治区自然科学基金(2021D01C094)。

摘　　要：为了改善五氧化二钒的电化学稳定性,采用水热法一步合成了V与Ca摩尔比不同的五氧化二钒/钙掺杂五氧化二钒(V_(2)O_(5)/Ca_(x)V_(2)O_(5))复合材料,以V_(2)O_(5)/Ca_(x)V_(2)O_(5)作为正极,金属锂片作为负极组装成电池,通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪等对复合材料的微观形貌、结构和元素组成进行了分析,通过电化学工作站对复合材料进行阻抗测试和循环伏安测试,研究了微观形貌和元素掺杂对复合材料电化学性能的影响。结果表明:Ca元素的掺杂使V_(2)O_(5)由纳米棒转化为纳米线,并且有利于提高电极的容量保持率,但Ca_(x)V_(2)O_(5)放电比容量较V_(2)O_(5)低,过量添加Ca元素会严重影响材料的储锂性能;当n(V)∶n(Ca)=1∶0.12时,V_(2)O_(5)/Ca_(x)V_(2)O_(5)复合材料储锂性能和循环稳定性达成平衡,初始放电比容量为100.7mAh/g,循环100圈容量保持率为58.9%,循环100圈总放电比容量为7332mAh/g。To enhance the electrochemical stability of V_(2)O_(5),V_(2)O_(5)/Ca_(x)V_(2)O_(5)composites with different molar ratios of V to Ca were synthesized in a single step using a hydrothermal method.Batteries were assembled using V_(2)O_(5)/Ca_(x)V_(2)O_(5)as the cathode and lithium metal sheets as the anode.The microstructure,structure,and elemental composition of the composites were analyzed using scanning electron microscopy,X-ray diffraction,and X-ray photoelectron spectroscopy.Impedance testing and cyclic voltammetry were performed on the composites using an electrochemical workstation to investigate the effects of microstructure and element doping on the electrochemical performance of the composites.The results indicated that the doping of Ca transformed V_(2)O_(5)from nanorods to nanowires and was beneficial for improving the capacity retention rate of the electrode.However,the specific discharge capacity of Ca x V_(2)O_(5)was lower than that of V_(2)O_(5),and excessive addition of Ca significantly affected the lithium storage performance of the material.When the molar ratio of n(V)∶n(Ca)was 1∶0.12,the V_(2)O_(5)/Ca_(x)V_(2)O_(5)composite achieved a balance between lithium storage performance and cycle stability,with an initial specific discharge capacity of 100.7mAh/g,a capacity retention rate of 58.9%after 100 cycles,and a total specific discharge capacity of 7332mAh/g after 100 cycles.

关 键 词：五氧化二钒 钙掺杂 电化学性能 水热法 复合材料 

分 类 号：TQ13[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]