摘要
通过共沉淀控制结晶法制备前驱体Ni_(0.25)Mn_(0.75)(OH)_(2),再通过高温固相法制备Al^(3+)掺杂的LiNi_(0.5-0.5x)Mn_(1.5-0.5x)Al_(x)O_(4)材料。XRD和SEM结果表明Al^(3+)被均匀掺杂到了材料的晶格中,替代了部分Ni和Mn,提升了材料的结晶度与结构稳定性。电化学测试结果表明掺杂Al^(3+)能有效提升材料的倍率性能与循环性能,LiNi_(0.475)Mn_(1.475)Al_(0.05)O_(4)在0.5 C下常温循环100次后容量保持率为96.75%,在0.5 C下55℃循环100次后容量保持率也能达到93.24%;常温下10 C放电容量达到101.45 mA·h/g;相比于LiNi_(0.5)Mn_(1.5)O_(4),掺杂Al^(3+)后的材料具有更好的可逆性与更高的锂离子导电率。
The precursor Ni_(0.25)Mn_(0.75)(OH)_(2) was prepared by co-precipitation controlled crystallization method,and then Al^(3+)-doped LiNi_(0.5-0.5x)Mn_(1.5-0.5x)Al_(x)O_(4) material was prepared by high temperature solid phase method.XRD and SEM results show that Al^(3+) is uniformly doped into the crystal lattice of the material to replace part of Ni and Mn,which improves the crystallinity and structural stability of the material.Electrochemical test results show that doping with Al^(3+) can effectively improve the rate performance and cycle performance of the material.The capacity retention rate of LiNi_(0.475)Mn_(1.475)Al_(0.05)O_(4) is 96.75%after 100 cycles at 0.5 C at room temperature,and 93.24%after 100 cycles at 55℃at 0.5 C,the discharge specific capacity is 101.45 mA·h/g at 10 C at room temperature.Compared with LiNi_(0.5)Mn_(1.5)O_(4),the material doped with Al^(3+) has better reversibility and higher lithium ion conductivity.
作者
谢涛雄
余林玉
李威
邓浩杰
任鹏文
江剑兵
XIE Taoxiong;YU Linyu;LI Wei;DENG Haojie;REN Pengwen;JIANG Jianbing(College of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《包装学报》
2022年第1期40-47,共8页
Packaging Journal
基金
国家自然科学基金资助项目(51604106)
湖南省教育厅科学研究基金资助项目(18C0492)
湖南省自然科学基金资助项目(2019JJ40070)
中国博士后科学基金资助项目(2016M602428)。
关键词
锂离子电池
共沉淀
高温固相法
铝掺杂
lithium ion battery
co-precipitation
high temperature solid phase method
Al3+doping
