自蔓延燃烧合成纳米正极材料LiFePO4  

Self-propagatingcombustion synthesis nano LiFePO4 cathode material

作　　者：李航 陈秀娟[1,2] 张鹏林[1] LI Hang;CHEN Xiu-juan;ZHANG Peng-lin(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;School of Mechanical and Electronical Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]兰州理工大学机电工程学院,甘肃兰州730050

出　　处：《金属功能材料》2018年第5期1-6,共6页Metallic Functional Materials

基　　金：国家自然科学基金项目资助(51161012);甘肃省重点研发项目资助(17YF1GA020)

摘　　要：通过采用自蔓延燃烧合成工艺制备了纳米正极材料LiFePO4,并研究了其合成反应机理。XRD及SEM的分析结果表明：自蔓延燃烧合成的LiFePO4呈类球形分布,结晶度较高,具有橄榄石结构,粒径分布在50-100nm之间;当C6H（12）N4添加量为30%、球料比为0.5∶1时,所合成的LiFePO4在电流密度0.1C下,样品的首次放电比容量是109.3mA·h·g^-1,循环50次后容量保持率为88.7%。燃烧波淬熄实验表明,LiFePO4的合成过程大致经历了两个反应阶段：球磨后的磷铁锰矿型Fe3（PO4）2向磷钙铁锰矿型Fe3（PO4）2晶型转变,之后磷钙铁锰矿型Fe3（PO4）2、Li2CO3经碳热还原反应生成LiFePO4。Nano-LiFePO4 cathode material has been successfully prepared by self-propagating high-temperature synthesis（SHS）process,and the synthesis reaction mechanism was studied by using combustion wave quenching experiments.The results of XRD and SEM analysis showed that LiFePO4 prepared by SHS was spherically distributed,high crystalline,olivine structure,and particle size distribution between 50-100 nm.LiFePO4 was synthetized under the condition that the adding amount of C6 H12 N4 was 30% and the ball feed ratio was 0.5∶1.The first discharge specific capacity of the sample is 109.3 mA·h·g^-1 when the current density was 0.1 C,and the capacity retention rate was 88.7% after 50 cycles.Quenching experiments showed that the synthesis process of LiFePO4 consisted of two stages：the Fe3（PO4）2 of graftonite changes into Fe3（PO4）2 of sarcopside after ball milling,and then LiFePO4 was generated by carbon thermal reduction reaction of sarcopside Fe3（PO4）2 and Li2 CO3.

关 键 词：自蔓延 淬熄 LIFEPO4 电化学 

分 类 号：TM912[电气工程—电力电子与电力传动]