Li2SO4—Li2O—P2O5体系非晶态Li^＋离子导体的研究

The Study on the Amorphous Li ￣+ Ionic Conductor of Li_2SO_4-Li_2O-P_2O_5 System

本文给出了非晶态Ｌｉ￣＋离子导体Ｌｉ＿２ＳＯ＿４－Ｌｉ＿ｂＯ－Ｐ＿２Ｏ＿５体系的制备条件、导电性以及差热分析（ＤＴＡ）结果，同时还对其晶化过程进行了研究。结果表明，首先成功地制备出了以Ｌｉ＿２ＳＯ＿４为基质的非晶态离子导电材料，并且在３５０℃时组成为Ｌｉ＿２ＳＯ＿４－０．３０Ｌｉ＿２Ｏ－０．７０Ｐ＿２Ｏ＿５样品的电导率最大（σ＝６．７８×１０￣（－３）Ω￣（－１）ｃｍ￣（－１）），这一结果与ＤＴＡ测量结果取得一致，ＳＥＭ证明是由于非晶母体部分晶化造成的。采用液氮温区急冷技术已成功的将该状态稳定到了室温，稳定后的态再重测其电导率随温度变化关系，相应的电导率提高３０％左右，如果找到某种合适的稳定剂使其一直处于微晶态，将为高电导率离子导体的制备提供一条新路。

The results of preparation,electricalconductivity measurement,and DTA, and theprocess of precrystalization on the amorphousLi_2SO_4-Li_2O-P_2O_5 system were presented. Theamorphous Li￣+conductive material of Li_2SO_4-basedsolid electrolytes had been successively prepared.The eletrical conductivity measurement indicated thatits value reached to the peak(σ=6. 78 ×10￣(-3)Ω￣(-1)cm￣(-1))at the composition of Li_2SO_4+0.30Li_2O+0.70P_2O_5. This value was consistent with the result ofDTA measurement with Li_2O/P_2O_5 ratios of 3/7. Itwas proved by SEM that this phenomenon was due tothe results of partial crystalization in the amorphousbody.The partial crystalization state was successlystabilized to room temperature by method of liquidN_2 quenching. Thus the conductivity of the stabilizedmicrocrystal ionic conductor was 30%higher thanthat of the original state. It was suggested that ifsome appropriate stabilized agents could be found,anew path would be provided for preparing theamorphous ionic conductor.