材料科学
石墨烯
阳极
电化学
扫描电子显微镜
氧化物
锂(药物)
X射线光电子能谱
阴极
电解质
磷酸钒锂电池
化学工程
煅烧
电极
纳米技术
复合材料
化学
冶金
物理化学
催化作用
内分泌学
工程类
医学
生物化学
作者
Wenyuan Duan,Yanlin Li,You Yang Zhao,Huimin Zhang,Jiao Liu,Yuzhen Zhao,Zongcheng Miao
出处
期刊:ACS omega
[American Chemical Society]
日期:2022-09-26
卷期号:7 (40): 35552-35561
被引量:2
标识
DOI:10.1021/acsomega.2c02833
摘要
K0.25V2O5 (KVO) and K0.25V2O5/graphene oxide (KVO/GO) have been successfully synthesized by a chemical coprecipitation method and a subsequent calcination process. The structure and morphology of KVO and KVO/GO were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The as-obtained vanadate and vanadate modified by GO materials were used as anodes with LiMn2O4 as a cathode and saturated LiNO3 as an electrolyte to assemble an aqueous rechargeable lithium-ion battery (ARLB). The cyclic voltammogram curves of both KVO and KVO/GO electrodes exhibited three pairs of redox peaks corresponding to charge/discharge platforms. We found that a small amount of graphene oxide added improved the electrochemical performance more significantly than excess graphene oxide. The as-prepared KVO/GO//LiMn2O4 could not only improve the initial discharge capacity but could also reduce the attenuation at a high current density. Furthermore, the ARLB with a KVO/GO anode exhibited an excellent rate performance and super long cycle life. These good electrochemical properties of this new ARLB system actually provided feasibility for application in large-scale power sources and energy storage devices.
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