LiMn_(0.6)Fe_(0.4)PO_4/碳纳米纤维复合材料的制备及电化学性能  

Synthesis and electrochemical performance of carbon nanofibers coated LiMn_(0.6)Fe_(0.4)PO_4

作　　者：周斌[1] 赵新兵[1] 曹高劭[1] 谢健[1] 

机构地区：[1]浙江大学材料科学与工程学系,浙江杭州310027

出　　处：《电池》2013年第2期66-69,共4页Battery Bimonthly

基　　金：教育部博士点基金(20100101120024);浙江省教育厅基金(Y201016484);浙江省钱江人才计划(2011R10021)

摘　　要：分别以磷酸铁、醋酸锰及氢氧化锂为铁源、锰源和锂源,磷酸二氢铵为补充磷源,先通过球磨混料与喷雾干燥获得前驱体,再在N2/乙炔气氛中、450℃下进行化学气相沉积(CVD)反应,以及在N2气氛中、不同温度下进行固相反应,得到LiMn0.6Fe0.4PO4和碳纳米纤维(CNF)的复合材料LiMn0.6Fe0.4PO4/CNF,对产物的微观结构、碳结构与含量及电化学性能进行分析。在600℃下烧结的样品循环稳定性更好,以1 C循环(2.5～4.5 V)200次,比容量仍有98.1 mAh/g。这是因为样品的颗粒尺寸小(200 nm)且分布均匀,具有合理的碳含量(1.95%),碳的石墨化程度高。To synthesize LiMno.6Fe0.4PO4 and carbon nanofibers composite material LiMn0.6Fe0.4PO4/CNF ,the precursor was pre-pared by ball-milling and spray-drying iron source iron phosphate, manganese source manganese acetate, lithium source lithium hy- droxide and added phosphate source ammonium dihydrate phosphate,then the precursor was subjected to chemical vapor deposition （CVD） reaction at 450 ℃ in N2/acetyccne atmosphere and solid phase reaction under different temperatures in N2 atmosphere. The microstructure, amount and structure of the carbon, electrochemical performance of the products were analyzed. The sample sintered at 600 ℃ had better electrochemical performance. Its specific capacity remained 98. 1 mAh/g after 200 times of 1 C cycle （2. 5 - 4. 5 V）. The reason was the small particle size（200 nm） and uniform size distribution,the reasonable amount of carbon（ 1.95% ） and the high graphitization of the carbon.

关 键 词：磷酸锰锂(LiMnPO4) 碳纳米纤维 乙炔(C2H2) 石墨化 

分 类 号：TM912.9[电气工程—电力电子与电力传动]