以Fe_2O_3为原料制备LiFePO_4/C复合材料及其性能研究  

Preparation and Properties of LiFePO_(4)/C Composite Materials with Fe_2O_3 as Starting Reactant

作　　者：王冠[1] 苏刚[1] 严曼明[1] 蔡文斌[1] 江志裕[1] 

机构地区：[1]复旦大学化学系上海分子催化和功能材料重点实验室,上海200433

出　　处：《高等学校化学学报》2007年第1期136-139,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20333040)资助

摘　　要：以Fe2O3为铁源原料,利用热还原法成功地制备了L iFePO4/C复合材料.用XRD以及SEM对材料的晶体结构以及表面形貌进行了表征.通过循环伏安和充放电测试研究了材料的电化学性能.研究结果表明,于700℃下制备的L iFePO4/C复合材料在0.1C的倍率下可以得到放电容量144.8 mA.h/g,在循环160次后,容量仍保持在141.4 mA.h/g.这种以廉价的Fe2O3代替目前常用的二价铁盐原料方法,具有减少L iFePO4合成成本的优点.LiFePO4 was considered as a new kind of cathode material candidate for lithium ion batteries due to its advantages. LiFePO4/C composites were successfully prepared from Fe2O3 via solid state reaction by a thermal reduction method in Ar ＋5% （volume fraction） H2 atmosphere. The crystal structure and electrochemical behavior of the materials were investigated using XRD, SEM, CV and charge/discharge cycle measurements. Based on the results of TGA-DTA, LiFePO4/C composites were synthesized at different temperatures, and it was found that the LiFePO4/C composites synthesized at 700℃ with 8.76% mass fraction carbon content presented the initial discharge capacity of 144. 8 mA ·h/g at 0. 1C, and after 160 cycles, the capacity remained as 141.4 mA · h/g. The method is available due to the low cost of Fe2O3 instead of using bivalent ferrous compound.

关 键 词：FE2O3 LIFEPO4 锂离子电池 

分 类 号：O646[理学—物理化学]