摘要
通过简单的溶剂热法,在溶剂热反应中将Mg掺入到LiMn_(0.8)Fe_(0.2)PO_4的晶格中。Mg的掺入不会对LiMn_(0.8)Fe_(0.2)PO_4的晶体形貌产生影响,掺杂前后材料均为200 nm以下的纳米片状颗粒。Rietveld全谱拟合结果显示,Mg掺杂后LiMn_(0.8)Fe_(0.2)PO_4材料的晶胞参数减小。同时,包碳处理后材料的离子混排度均低于0.5%,Mg掺杂后材料的离子混排度增加,提高材料导电性。Li Mn_(0.75)Fe_(0.2)Mg_(0.05)PO_4材料在1 C倍率充放电时的放电比容量为110 m Ah/g,100次循环后的容量保持率为94%,Mn的容量得到更多的发挥,材料极化程度最低。
Mg is doped into the lattice of LiMno. s Fe0. 2 PO4 via facile solvothermal process. LiMno. s Fe0.2 PO4 particles remain nano - plated morphology after Mg dopings, less than 200 nm in length. Rietveld refinement shows that lattice constants reduce after Mg doping and more capacity of Mn is activated. Cation mixing between Li＋ and other metal ions is less than 0.5%, thus improving the electrical conductivity. Discharge capacity of Mn site doped LiMno.75Fe0.2Mg0.05PO4 material at 1 C is 110 mAh ·g-1 and capacity retention rate is 94% after 100 cycles, showing more activated capacity of Mn,lowest polarization and excellent result in prooerty improvement.
出处
《山东化工》
CAS
2017年第13期10-13,共4页
Shandong Chemical Industry
