摘要
五氧化二钒(V_(2)O_(5))因其具有层状结构、高容量、低成本、资源丰富、高的Na^(+)离子电导率、Na^(+)嵌入/脱嵌时体积变化小、中等电位平台等优点而受到广泛关注。以V_(2)O_(5)和草酸为原料,采用水热法成功制备了V_(2)O_(5)/石墨烯纳米复合材料(V_(2)O_(5)/rGO)。结果表明:石墨烯与V_(2)O_(5)纳米线相互紧密交织,形成连续的V_(2)O_(5)-石墨烯网络结构;V_(2)O_(5)-石墨烯网络结构提供了快速的电子转移速度,扩展了电极材料与电解液的有效接触面积,提高了材料的导电性,缓冲了钠离子嵌入引起的体积变化,从而使V_(2)O_(5)/rGO纳米复合材料的储钠性能得到有效地改善(100 mA/g时,100次循环后,放电比容量为154 mAh/g)。
Vanadium pentoxide(V_(2)O_(5)) has attracted extensive attention due to its layered structure,abundant resources, high capacity, low cost, high Na^(+)ionic conductivity, small volume change during Na-ion insertion/extraction, and mesopotential platform. V_(2)O_(5)/graphene nanocomposites were successfully prepared by hydrothermal method, using oxalic acid and V_(2)O_(5)as raw materials. The results show that the V_(2)O_(5)nanowires and graphene are closely intertwined with each other, forming a V_(2)O_(5)-graphene nanocomposite with a tightly network structure. The structure can provide fast electron transfer kinetics,expand the effective contact area between the electrolyte and the electrode material, improve the conductivity of the material and buffer volume changes during Na-ion insertion/extraction. Thus, the electrochemistry properties of V_(2)O_(5)/rGO nanocomposites are effectively improved(Over 100 cycles,154 mAh/g at 100 mA/g).
作者
郑浩
彭毅
王仕伟
孟伟巍
杜光超
Zheng Hao;Peng Yi;Wang Shiwei;Meng Weiwei;Du Guangchao(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China)
出处
《钢铁钒钛》
CAS
北大核心
2023年第1期32-37,共6页
Iron Steel Vanadium Titanium
关键词
V_(2)O_(5)
石墨烯
纳米复合材料
钠离子电池
正极材料
储钠性能
vanadium pentoxide
reduced graphene oxide
nanocomposites
sodium-ion batteries
cathode materials
sodium storage properties
