摘要
LiMn_(1-x)Fe_(x)PO_(4)具有成本低廉、环境友好、能量密度高和稳定性高等优点,在锂离子电池中具有良好的应用前景。目前在制备LiMn_(1-x)Fe_(x)PO_(4)的各种方法中,液相法制得的产品性能较佳。文中以葡萄糖为碳源,通过氢氧化物共沉淀法和球磨法,利用固相反应制备了碳包覆的LiMn_(0.6)Fe_(0.4)PO_(4)纳米颗粒。经过电化学测试,LiMn_(0.6)Fe_(0.4)PO_(4)在0.3 C、0.5 C、1 C和2 C倍率下的放电比容量约为127 mAh/g、119 mAh/g、104 mAh/g和82 mAh/g,且在1 C和2 C下循环200圈后的容量保持率均接近100%,该材料具有良好的倍率性能和循环稳定性。
LiMn_(1-x)Fe_(x)PO_(4) with the advantages of low cost,environmental friendliness,high energy density as well as high stability,has a promising application for lithium-ion batteries.Among various methods for preparing LiMn_(1-x)Fe_(x)PO_(4),the solution method is suitable for its synthesis because of the better performance of the product.In this paper,the glucose was used as carbon source to obtain carbon-coated LiMn_(0.6)Fe_(0.4)PO_(4) nanoparticles by solid-phase reaction through hydroxide co-precipitation method and ball-milling method.The electrochemical testing results showed that the LiMn_(0.6)Fe_(0.4)PO_(4)/C composite could deliver discharge capacities of 127 mAh/g,119 mAh/g,104 mAh/g and 82 mAh/g at 0.3 C,0.5 C,1 C and 2 C rate,respectively.In addition,the capacity retention was nearly 100%after 200 cycles at 1 C and 2 C,showing the excellent rate capability and cyclability.
作者
王洪波
郭乙成
陈昊
张贵朝
WANG Hongbo;GUO Yicheng;CHEN Hao;ZHANG Guichao(School of Materials Science and Engineering,Henan Institute of Technology,Xinxiang,Henan Province,453003,China)
出处
《电池工业》
CAS
2024年第4期163-168,178,共7页
Chinese Battery Industry
基金
河南省高等学校重点科研项目(20B150005)
河南工学院博士科研启动基金(KQ1849)。
关键词
磷酸锰铁锂
共沉淀法
正极材料
锂离子电池
碳包覆
lithium manganese iron phosphate
co-precipitation method
cathode material
lithiumion batteries
carbon coating
