前躯体预掺杂合成锰酸锂正极材料的研究  

Investigation of LiMn_2O_4 Cathode Material Synthesized from Pre-doped Precursor

作　　者：王以存[1] 张晓泉[1] 杨洋[1] 王志鹏[1] 鲁俊[1] 陈思学[1] 陈治强[1] 

机构地区：[1]中钢集团安徽天源科技股份有限公司南京磁性材料厂,江苏南京211800

出　　处：《中国锰业》2017年第3期122-125,共4页China Manganese Industry

摘　　要：采用电解金属锰悬浮液法制备铝掺杂四氧化三锰,并利用上述前躯体合成铝掺杂锰酸锂正极材料。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、电感耦合等离子光谱发射仪(ICP)等手段对样品相组成、微观形貌以及理化指标进行表征,并考察了铝掺杂对合成锰酸锂材料电化学性能的影响。结果表明:对四氧化三锰进行铝掺杂能有效提高最终合成产物的电化学性能,在对四氧化三锰原料进行1%铝含量的掺杂后,以此为原料合成的锰酸锂正极材料0.2 C放电容量达到124.34 m A·h/g,高温55℃下循环100次,容量保持率为90.74%。Cathode material of Al^3＋ doped LiMn2O4 was synthesized from Al - doped Mn3O4 precursor which was obtained by electro -oxidation of suspension in containing metallic Mn particles. The phase composition, surface morphology, physical/chemical properties of the synthesized powders were characterized by means of XRD, SEM, ICP, etc. The effects of Al doping on the electrochemical properties of LiMn2O4 powders were also examined. The results show that electrochemical performances are enhanced by the doping with Al, LiMn2O4 synthesized from Mn3O4 with 1wt. % Al doping shows an initial discharge capacity of 124.34 mAh/g at 25℃ and 0.2C rate. The capacity retention is 90.74% after 100 cvcles at 55℃ and 1 C rate.

关 键 词：正极材料 锰酸锂 四氧化三锰 AL掺杂 

分 类 号：TQ131[化学工程—无机化工]