摘要
采用共沉淀法和固相烧结法制备了一种杂质少、物相分布均匀、电化学性能优良的LiMn_(0.6)Fe_(0.4)PO_(4)/C(LMFP)复合材料。结果表明,该方法在脱去NH_(4)^(+)和H_(2)O的同时,抑制了Mn_(2)P_(2)O_(7)物相的产生,提高了LMFP的锂离子扩散速率。由LiMn_(0.6)Fe_(0.4)PO_(4)/C组装的锂离子电池展示了优异的电化学性能,1C下首次放电比容量145.5 mAh/g;5C下首次放电比容量111.9 mAh/g。该工艺简单、成本低,适合工业化生产,为设计高性能的商业化锂离子电池正极材料提供了可行性方案。
LiMn_(0.6)Fe_(0.4)PO_(4)/C(LMFP)composite synthesized by a combined process of co-precipitation and solid-phase sintering not only has low impurity content,uniform phase distribution,but also exhibits excellent electrochemical performance.It is shown that such process can inhibit the formation of Mn_(2)P_(2)O_(7)phase and improve the lithium ion diffusion rate of LMFP,while removing NH_(4)^(+)and H_(2)O.The Li-ion batteries assembled with LiMn_(0.6)Fe_(0.4)PO_(4)/C exhibit excellent electrochemical performance,showing initial specific discharge capacity of 145.5 mAh/g at 1C and 111.9 mAh/g at 5C.It is concluded that this process,being simple and cost-effective,is suitable for industrial production.Such study provides a feasible scheme in designing cathode materials for commercialized high-performance Li-ion batteries.
作者
丁伦涛
赵鹏
周春仙
王德志
吴壮志
李雪豹
周友元
DING Luntao;ZHAO Peng;ZHOU Chunxian;WANG Dezhi;WU Zhuangzhi;LI Xuebao;ZHOU Youyuan(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Hunan Changyuan Lico Co.,Ltd.,Changsha 410221,Hunan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第4期24-30,共7页
Mining and Metallurgical Engineering
基金
长沙市科技重大专项(kh2401022)。
作者简介
丁伦涛(2000-),男,湖南长沙人,硕士研究生,主要研究方向为锂离子电池正极材料性能研究。E-mail:1160953263@qq.com;通信作者:周友元(1970-),男,湖南新宁人,博士,教授级高级工程师,主要从事新能源材料研究。E-mail:yyzhou@minmetals.com。
