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以氢氧化锂、柠檬酸以及醋酸锰、醋酸镁为原料,利用低温固相法制备了LiMn2O4及其Mg元素的掺杂产物,采用XRD、FTIR和恒流充放电测试研究了合成产物的性能。XRD测试表明,所有产物均为尖晶石相结构,Mg离子能很好地溶入尖晶石相产物的晶格之中;FTIR结果显示,经过Mg元素掺杂改性后,产物中的Mn(Ⅳ)-O和Mn(Ⅲ)-O键分别存在着蓝移和红移现象;电化学测试则表明,LiMg0.2Mn1.8O4的初始电化学容量较LiMn2O4低,但经过一定的循环次数后,电化学容量超过了LiMn2O4,且在整个循环过程中LiMg0.2Mn1.8O4的容量衰减率较小,循环性能相对于未掺杂前的产物得到了较大的提高。
Abstract：The positive materials LiMn2O4 and LiMg0.2Mn1.8O4 were synthesized with LiOH·H2O,C6H8O7·H2O,Mn(CH3COO)2·4H2O,Mg(CH3COO)2·4H2O by solid phrase method in low temperature.And their performance was tested by XRD,FTIR and costant-current charging/discharging methods.The test results showed that,Mg2+ was adulterated in the spinel crystal lattice,and caused different effects on the structure and FTIR charater of spinel LiMn2O4.Initial capacity of LiMg0.2Mn1.8O4 decreased in some degree,but both cyclic performance and electrochemical capacity after cycling improved a lot.
[1]芳尾真幸,小泽昭弥.リチウムイオン二次电池-材料と应用[M].東京:日刊工業新闻社,1996:57-58.
[2]Kim J-H,Myung S-T,Sun Y-K.Molten salt synthesis of Li-Ni0.5Mn1.5O4 spinel for 5 V class cathode material of Li-ionsecondary battery[J].Electrochimica Acta,2004,49(2):219-227.
[3]Thirunakaran R,Kim Ki-Tae,Kang Yong-Mook,et al.Cr3+modified LiMn2O4 spinel intercalation cathodes through oxalicacid assisted sol-gel method for lithium rechargeable batter-ies[J].Materials Research Bulletin,2005,40(1):177-186.
[4]Sun Yucheng,Wang Zhaoxiang,Huang Xuejie,et al.Synthe-sis and electrochemical performance of spinel LiMn2-x-yNixCry-O4 as 5V cathode materials for lithium ion batteries[J].J Pow-er Sources,2004,132(1-2):161-165.
[5]Fu Yen-Pei,Su Yu-Hsiu,Lin Cheng-Hsiung.Comparison ofmicrowave-induced combustion and solid-state reaction forsynthesis of LiMn2-xCrxO4 powders and their electrochemicalproperties[J].Solid State Ionics,2004,166(1-2):137-146.
[6]康慨,戴受惠,万玉华.固相配位化学反应法合成LiMn2O4的研究[J].功能材料,2001,31(3):283-286.
[7]Huang Yudai,Li Juan,Jia Dianzeng.Preparation and charac-terization of LiMn2-yCoyO4 spinels by low heating solid statecoordination method[J].Journal of Colloid and Interface Sci-ence,2005,286(1):263-267.
[8]Bragg W H,Bragg W L.The reflection of X-rays by crystals[C]//Proc.Roy.Soc.Londen,1913,88(A605):428-438.
[9]吴宇平,戴晓兵,马军旗,等.锂离子电池-应用与实践[M].北京:化学工业出版社,2004:168-169.
[10]李琪,李飞,乔庆东.Li1+xMn2O4的合成及表征[J].石油化工(高等学校学报),2002,12,17(4):22-25.
[11]Wu C,Wang Z,Wu F,at el.Spectroscopic studies oncation-doped spinel LiMn2O4 for lithium ion batteries[J].Solid State Ionics,2001,114(3-4):277-285.
[12]武汉大学,吉林大学等校编,曹锡章,王杏乔,宋天佑修订.无机化学[M].第3版.北京:高等教育出版社,1994:123.
基本信息:
DOI：
中图分类号:TM912.9
引用信息:
[1]刘立朋.尖晶石相LiMg_(0.2)Mn_(1.8)O_4的制备与性能研究[J].电池工业,2008,No.73(01):40-43.
基金信息: