LiMn_(0.6)Fe_(0.4)PO_(4)/C正极材料的制备与电化学性能研究  

Synthesis and Electrochemical Performance of LiMn_(0.6)Fe_(0.4)PO_(4)/C Cathode Materials

作　　者：丁伦涛 赵鹏 周春仙 王德志[1] 吴壮志[1] 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)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]湖南长远锂科股份有限公司,湖南长沙410221

出　　处：《矿冶工程》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)。

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.

关 键 词：锂离子电池 磷酸铁锂 磷酸锰铁锂 正极材料 LiMn_(0.6)Fe_(0.4)PO_(4) 前驱体 煅烧 碳包覆 工业化 

分 类 号：TM912[电气工程—电力电子与电力传动]