矿冶工程
礦冶工程
광야공정
2014年
4期
119-121,127
,共4页
锰酸锂%正极材料%二氧化锰还原法%电化学性能
錳痠鋰%正極材料%二氧化錳還原法%電化學性能
맹산리%정겁재료%이양화맹환원법%전화학성능
LiMn2 O4%cathode material%MnO2 reduction method%electrochemical performance
采用二氧化锰还原法制备了锰酸锂前驱体,将前驱体在不同温度下进行热处理,制得尖晶石型锰酸锂。利用AAS、滴定法、XRD、SEM表征样品的元素含量、晶体结构、形貌和粒径,并研究了不同热处理温度对锰酸锂电化学性能的影响。结果表明,通过二氧化锰还原法合成出了具有一定尖晶石结构的锰酸锂前驱体。当热处理温度为800℃时,锰酸锂的导电性最佳,0.2C放电容量为132.7 mAh/g,0.5C放电容量为123.9 mAh/g,循环10次后,容量衰减5.97%。
採用二氧化錳還原法製備瞭錳痠鋰前驅體,將前驅體在不同溫度下進行熱處理,製得尖晶石型錳痠鋰。利用AAS、滴定法、XRD、SEM錶徵樣品的元素含量、晶體結構、形貌和粒徑,併研究瞭不同熱處理溫度對錳痠鋰電化學性能的影響。結果錶明,通過二氧化錳還原法閤成齣瞭具有一定尖晶石結構的錳痠鋰前驅體。噹熱處理溫度為800℃時,錳痠鋰的導電性最佳,0.2C放電容量為132.7 mAh/g,0.5C放電容量為123.9 mAh/g,循環10次後,容量衰減5.97%。
채용이양화맹환원법제비료맹산리전구체,장전구체재불동온도하진행열처리,제득첨정석형맹산리。이용AAS、적정법、XRD、SEM표정양품적원소함량、정체결구、형모화립경,병연구료불동열처리온도대맹산리전화학성능적영향。결과표명,통과이양화맹환원법합성출료구유일정첨정석결구적맹산리전구체。당열처리온도위800℃시,맹산리적도전성최가,0.2C방전용량위132.7 mAh/g,0.5C방전용량위123.9 mAh/g,순배10차후,용량쇠감5.97%。
Precursors of LiMn2O4 were prepared by MnO2 reduction method. The precursors were subjected to heat treatment at different temperatures to obtain spinel-type LiMn2 O4 . The element content, crystalline structure, morphology and particle size of the samples were characterized by AAS, titration, XRD and SEM. The effect of different temperature for heat treatment on electrochemical properties of LiMn2 O4 was investigated. Results show that the precursor of LiMn2 O4 with certain spinel structure could be synthesized by MnO2 reduction method. The LiMn2 O4 sample treated at 800 ℃shows the best electrical conductivity. The discharge capacity is 132. 7 mAh/g at 0. 2C-rate. The discharge capacity is 123.9 mAh/g at 0.5C-rate. The capacity attenuation rate is 5.97% after 10 charge-discharge cycles.