CAJ | 학술논문

采用工业上常用的碳酸锰热解法制备锰氧化物前驱体，与 Li2CO3混合后焙烧得到锂离子电池正极材料LiMn2O4，并在碳酸锰制备过程中掺入铝离子制备LiAlxMn2?xO4( x=0.01,0.02,0.03,0.05,0.1)。通过X射线衍射(XRD)和扫描电镜(SEM)对样品进行表征，并对合成材料在常温和高温(55℃)下的电化学性能进行研究。结果表明：合成的前驱体及锰酸锂材料均无杂相；随着 Al3+掺杂量的增加，LiAlxMn2-xO4颗粒尺寸不断长大；材料的首次充放电比容量随 Al3+掺杂量的升高而下降，但循环性能提高；Al3+的掺入极大地提高了材料的循环性能，尤其是在高温条件下，当掺杂量x=0.05时，1C倍率下循环100次容量的保持率由未掺杂的72.2%升高到90.7%。
채용공업상상용적탄산맹열해법제비맹양화물전구체，여 Li2CO3혼합후배소득도리리자전지정겁재료LiMn2O4，병재탄산맹제비과정중참입려리자제비LiAlxMn2?xO4( x=0.01,0.02,0.03,0.05,0.1)。통과X사선연사(XRD)화소묘전경(SEM)대양품진행표정，병대합성재료재상온화고온(55℃)하적전화학성능진행연구。결과표명：합성적전구체급맹산리재료균무잡상；수착 Al3+참잡량적증가，LiAlxMn2-xO4과립척촌불단장대；재료적수차충방전비용량수 Al3+참잡량적승고이하강，단순배성능제고；Al3+적참입겁대지제고료재료적순배성능，우기시재고온조건하，당참잡량x=0.05시，1C배솔하순배100차용량적보지솔유미참잡적72.2%승고도90.7%。
The spinel LiMn2O4 was synthesized by manganese carbonate pyrolysis method and Al3+was doped during the MnCO3 synthesis process to get LiAlxMn2?xO4 (x=0.01, 0.02, 0.03, 0.05, 0.1). The samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and their electrochemical performance were tested at room temperature and elevated temperature (55℃). The results of MnCO3 and LiMn2O4 have no apparent. With the increase of the doping amounts of Al3+, the particle sizes of LiAlxMn2-xO4 become larger, and the first discharge capacity of LiMn2O4 decrease to some degree. But the LiAlxMn2?xO4 electrode exhibits superior cycling performance. Especially, at elevated temperature (55℃), the capacity retention increases from 72.2%for LiMn2O4 to 90.7% for LiAl0.05Mn1.95O4 after 100 cycles at 1C.