CAJ | 학술논문

采用金属锰粉悬浮液氧化法、焙烧法、两步法制备 Mn3 O4。根据 Li2 CO3/ Mn3 O4混合粉体的 TG-DTA 分析结果，以高温固相法合成尖晶石 LiMn2 O4。通过 X 射线衍射、扫描电子显微镜、恒流充放电技术及交流阻抗，对这合成样品尖晶石 LiMn2 O4的物相、形貌以及电化学能进行检测分析，采用电位跃迁法测试计算出尖晶石 LiMn2 O4电极材料的扩散系数。结果表明，用3种不同方法制备的 Mn3 O4都能合成颗粒大小均匀的尖晶石 LiMn2 O4，在室温下以0.2 C 倍率充放电循环30次时，以悬浮液氧化法制备 Mn3 O4合成的尖晶石 LiMn2 O4首次放电比容量和容量保持率分别为130.0 mA·h/ g 和98.1%，优于另外两种方法制备 Mn3 O4合成的尖晶石 LiMn2 O4。以不同 Mn3 O4合成尖晶石 LiMn2 O4电极材料的扩散系数 DLi +分别为：7.78×10-11，5.01×10-11，3.26×10-11 cm2/ s。
채용금속맹분현부액양화법、배소법、량보법제비 Mn3 O4。근거 Li2 CO3/ Mn3 O4혼합분체적 TG-DTA 분석결과，이고온고상법합성첨정석 LiMn2 O4。통과 X 사선연사、소묘전자현미경、항류충방전기술급교류조항，대저합성양품첨정석 LiMn2 O4적물상、형모이급전화학능진행검측분석，채용전위약천법측시계산출첨정석 LiMn2 O4전겁재료적확산계수。결과표명，용3충불동방법제비적 Mn3 O4도능합성과립대소균균적첨정석 LiMn2 O4，재실온하이0.2 C 배솔충방전순배30차시，이현부액양화법제비 Mn3 O4합성적첨정석 LiMn2 O4수차방전비용량화용량보지솔분별위130.0 mA·h/ g 화98.1%，우우령외량충방법제비 Mn3 O4합성적첨정석 LiMn2 O4。이불동 Mn3 O4합성첨정석 LiMn2 O4전겁재료적확산계수 DLi +분별위：7.78×10-11，5.01×10-11，3.26×10-11 cm2/ s。
Mn3 O4 were prepared by oxidation with suspension solution,baking process and tow-step meth-od. Based on the TG-DTA analysis for Li2 CO3 / Mn3 O4 mixture power,spinel LiMn2 O4 was synthesized via solid-phase method. The phase identification,surface morphology and electrochemical properties of the three kinds of the synthesized powders were characterized by means of XRD,SEM,galvanostatic charge-discharge experiments,EIS and PSCA. The results show Mn3 O4 prepared by three different methods can synthesize spinel LiMn2 O4 and LiMn2 O4 powders are uniform and show best crystallization. When cycled at room temperature for 30 times at the charge-discharge rate of 0. 2,LiMn2 O4 prepared by Mn3 O4 using oxidation with suspension solution shows the highest initial charge specific capacity and capacity retention of 130. 0 mA·h / g and 98. 1% . The diffusion coefficient of lithium ion of LiMn2 O4 are 7. 78 × 10 - 11 , 5. 01 × 10 - 11 ,3. 26 × 10 - 11 cm2 / s,respectively.