摘要
为了满足未来动力市场对于高比容量和高能量密度电池的需求,优化无钴富锂锰基正极材料(LMO)的合成条件对于实现其商业化具有举足轻重的意义。通过高温固相法研究了Li_(x)(Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2))(1.04≤x≤1.16)的最佳烧结温度及配锂比,结合SEM、XRD等仪器对合成样品的物相结构和微观形貌进行了表征,并采用电池测试系统对样品的电化学性能进行了测试。结果表明,当烧结温度为1000℃,配锂比为1.65时得到的二次颗粒大小均一,结晶性良好,电化学性能较佳。10 mA·g^(−1)电流密度下首次放电比容量达260.5 mAh·g^(−1),100 mA·g^(−1)电流密度下充放电循环100周后容量保持率为96%。
In order to meet the demand for high specific capacity and high energy density batteries in the future power market,optimising the synthesis conditions of cobalt-free lithium-rich manganese-based cathode material(LMO)is of great significance for its commercialization.In this paper,the optimum sintering temperature and lithium ratio of Li_(x)(Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2))(1.04≤x≤1.16)were studied by high temperature solid phase method.The phase structure and microstructure of the synthesized samples were characterized by SEM,XRD and other analytical techniques,and the electrochemical performance of the samples was evaluated by battery test system.The results show that at a sintering temperature of 1000℃and the lithium ratio is 1.65,the synthesized secondary particles exhibit uniform size,good crystallinity and superior electrochemical performance.The initial discharge specific capacity is 260.5 mAh·g^(−1)at 10 mA·g^(−1)current density,and the capacity retention rate is 96%after 100 cycles at 100 mA·g^(−1)current density.
作者
于楚瑶
寇鹏祖
张志贵
王健行
王志远
左昌玲
汪宽镕
刘政宇
Chuyao;KOU Pengzu;ZHANG Zhigui;WANG Jianxing;WANG Zhiyuan;ZUO Changling;WANG Kuanrong;LIU Zhengyu(School of Resources and Materials,Northeastern University,Qinhuangdao 066004,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)
出处
《有色金属(中英文)》
北大核心
2025年第2期217-224,共8页
Nonferrous Metals
基金
国家自然科学基金资助项目(52071073)
大学生创新创业项目(ZD202306)。
关键词
无钴正极
富锂锰基
条件优化
cobalt-free cathode
lithium-rich manganese-based
condition optimization
