CAJ | 학술논문

以醋酸锂和钛酸四正丁酯为原料，使用NH4HCO3作为结构引导剂，通过溶剂热法后固相烧结合成了具有尖晶石型介孔球形Li4Ti5O12，探讨了不同的钛锂比和热处理温度及NH4HCO3用量对Li4Ti5O12结构和电化学性能的影响，并通过X射线衍射光谱法(XRD)，扫描电子显微镜法(SEM)和恒流充放电对其进行了表征。结果表明通过该法在钛锂摩尔比为5∶4.3时，在800℃下热处理3 h可获得晶型与标准谱一致的Li4Ti5O12，在溶剂热过程中使用NH4HCO3做为结构诱导剂时，可获得具有介孔结构的球形Li4Ti5O12材料，该材料在充放电过程中显示出了较好的电化学性能。
이작산리화태산사정정지위원료，사용NH4HCO3작위결구인도제，통과용제열법후고상소결합성료구유첨정석형개공구형Li4Ti5O12，탐토료불동적태리비화열처리온도급NH4HCO3용량대Li4Ti5O12결구화전화학성능적영향，병통과X사선연사광보법(XRD)，소묘전자현미경법(SEM)화항류충방전대기진행료표정。결과표명통과해법재태리마이비위5∶4.3시，재800℃하열처리3 h가획득정형여표준보일치적Li4Ti5O12，재용제열과정중사용NH4HCO3주위결구유도제시，가획득구유개공결구적구형Li4Ti5O12재료，해재료재충방전과정중현시출료교호적전화학성능。
The mesoporous Li4Ti5O12 microspheres were synthesized by solvothermal method fol owed by solid-state calcinations using lithium acetate and tetrabutyl titanate as raw materials, NH4HCO3 as the structure-directing agent. The effects of different mole ratios of titanium to lithium, calcination temperature and the quantity of NH4HCO3 on the structure and electrochemical performance of Li4Ti5O12 were investigated by XRD, SEM and constant current charge-discharge. The results show that when the mole ratio of titanium to lithium is 5∶4.3 and the materials are calcined for 3 h at 800 ℃, the product is spinel Li4Ti5O12 which fits standard spectra. Using NH4HCO3 as the structure-directing agent during solvothermal process, mesoporous Li4Ti5O12 microspheres are obtained, having better electrochemical performance during charging and discharging.