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非化学计量比Li_1+xNi_0.8Co_0.2O₂结构和性能研究

Study on the Structure and Electrochemical Characterization of the Non-stoichiometric Li_1+xNi_0.8Co_0.2O₂ Materials

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【Author】 GU Yi-jie1,2,KONG Huan1,HUANG Xiao-wen1,CUI Hong-zhi1,WU Hui-kang2,DU Hong-yan2,ZHANG Hong-tao3,ZHOU Heng-hui4,WEI Qing4(1.College of Materials Science and Technology,Shandong University of Science and Technology,Qingdao 266510,Shandong,China;2.New Energy Materials R&D Centre,Qingdao Aucma Co Ltd,Qingdao 266510,Shandong,China;3.Department of Materials,Queen Mary University of London,London E14NS;4.College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

【机构】山东科技大学材料学院；青岛澳柯玛集团有限公司新能源材料研发中心； Department of Materials Queen Mary University of London；北京大学化学与分子工程学院；山东青岛266510； London E14NS；北京100871；

【摘要】共沉淀法合成了层状Li1+xNi0.8Co0.2O2(x=0和0.05),采用XRD和电化学方法对其进行了研究。与LiNi0.8Co0.2O2相比,Li1.05Ni0.8Co0.2O2有较高的放电容量和较差的循环性能。与LiNi0.8Co0.2O2放电容量微分曲线相似,Li1.05Ni0.8Co0.2O2在4.15 V存在负峰,随着循环次数的增加,4.15 V负峰峰位明显向左移。与LiNi0.8Co0.2O2放电容量微分曲线不同,层状结构Li1.05Ni0.8Co0.2O2的4.15 V负峰峰高随循环次数的增加而增高,循环过程促进了Li1.05Ni0.8Co0.2O2结构转变。更多还原

【Abstract】 The structure and electrochemical performance of layered Li1+xNi0.8Co0.2O2 with x=0 and 0.05 was prepared by co-precipitation were investigated by XRD and electrochemical method respectively.In contrast with LiNi0.8Co0.2O2,Li1.05Ni0.8Co0.2O2 possessed the better specific capacity and the worse cycling performance.There was a negative peak at 4.15 V in the discharge differential capacity plots of Li1.05Ni0.8Co0.2O2.The peak place moved towards the left side and the peak height increased with the electrochemical cycle times.The analysis indicates that the electrochemical cycle accelerates the structure transition for Li1.05Ni0.8Co0.2O2.更多还原