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	铬离子掺杂对LiFePO_4电化学性能的影响; Effect on the electrochemical performance of lithium iron phosphate by Cr3+ ion doping
	倪江锋 ; 周恒辉 ; 陈继涛 ; 苏光耀
	2004
关键词	磷酸亚铁锂 共沉淀 离子掺杂 电子导电率 嵌锂容量 正极材料 lithium iron phosphate co-precipitation ion doping electronic conductivity lithium intercalation capacity positive electrode material
英文摘要	采用机械球磨和共沉淀的方法合成了两种Cr3+掺杂的LiFePO4.通过对合成样品的XRD、SEM及其电化学性能(循环性能、大电流放电性能)的研究表明,少量Cr3+的掺杂未影响到LiFePO4的晶体结构,但显著改善了它的电化学性能,在低放电倍率(0.1 C)时,机械球磨掺杂和共沉淀掺杂Cr3+的LiFePO4的放电容量分别为144和158 mAh·g～1,而当放电倍率提高到2 C时,两种掺杂的LiFePO4仍分别具有110和130 mAh·g-1的放电容量,且循环性能良好.同时表明通过铁源共沉淀掺杂是一条改善离子掺杂效果的有效途径.; Two different methods (mechanical ball-milling and co-precipitation) were applied to prepare lithium iron phosphate (LiFePO4) containing low concentration (1%, mole fraction) Cr3+ ion dopant. The samples were characterized by X-ray diffraction and scanning electron microscope, and their electrochemical performances were investigated including cycling behavior and large current discharging. The results indicate that the Cr3+ ion dopant does not affect the structure of the material but considerably improves its kinetics in terms of capacity delivery and cycle performance. At a low discharging rate (0.1 C), LiFePO4 samples doping via mechanical ball-milling and co-precipitation are capable of delivering reversible specific capacities of 144 mAh . g(-1) and 158 mAh . g(-1) respectively, with fairly stable cycleability. Even at a 2C discharging rate, they can show capacities of 110 mAh g (-1) and 130 mAh . g(-1) respectively, too. The results also confirm that doping via co-precipitation with Fe sources is an effective method to improve the ion doping effect.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000222223400006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 22; 06; 582-586; 20
语种	中文
出处	万方 ; 知网 ; SCI
出版者	物理化学学报
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/80622]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	倪江锋,周恒辉,陈继涛,等. 铬离子掺杂对LiFePO_4电化学性能的影响, Effect on the electrochemical performance of lithium iron phosphate by Cr3+ ion doping. 2004-01-01.

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