红柳基锂电池负极材料的制备及电化学性能

Preparation and electrochemical properties of negative eletrode materials for tamarium-based lithiumion batteries

以中国西北地区特色植物红柳为碳源,经过干燥、热解和酸洗等处理,通过机械破碎的方法制得纳米碳颗粒(CRN),以其为主要活性材料制备了锂电池硬碳负极并研究了电化学性能。利用X射线衍射仪(XRD)、激光显微拉曼光谱仪(Raman)以及扫描电镜(SEM),分别对所制备CRN的物相结构、石墨化程度和表面形貌进行对比分析。采用恒流充放电对所制备的负极材料进行比容量、倍率和循环稳定性测试,使用电化学工作站(CHI660E)分析了负极材料的交流阻抗(EIS)和循环伏安(CV)。结果表明,干燥后的红柳经过500、600、700和800℃的低温热解和HCl酸洗处理后,低温热解温度为600℃时所制得的CRN循环稳定性、比容量和倍率性能最佳。本研究表明,以红柳为碳源制备的CRN完全可以用于锂电池负极材料。

Nanocarbon particles(CRN)were prepared from red willow,which mostly exists planted in the northwest of China,processed by the mechanical crushing method after drying,pyrolysis,and pickling treatment processing.The electrochemical properties of a lithium-ion anode based primarily on CRN were investigated.X-ray diffractometry(XRD),Raman,and scanning electron microscopy(SEM)were used to examine the phase structure,degree of graphitization,and surface topography,respectively.Constant current charge and discharge were used to test the anode's specific capacity,magnification,and cycle stability.An electrochemical work-station was used to analyze the anode's electrochemical impedance spectroscopy(EIS)and cyclic voltammetry(CV)(CHI660E).The results show that the CRN prepared at 600℃in the pyrolyzed temperature(500℃,600℃,700℃,and 800℃)has better cycle stability,higher specific capacity,and the best magnification.This study shows that the CRNprepared from red willow can be used properly as the anode of lithium-ion batteries.