摘要
本文研究了非晶锂离子导体P_2O_3-0.7L_1_2O-0.4LiCl-0.10Al_2O_3的60目、120目、200目粉末、粉末压片和整片非晶在60至380℃的离子电导率和激活能。发现颗粒度减小能使离子电导率提高四倍以上,但不影响激活能,它归因于同一非晶相的界面效应。各样品在380℃等温热处理76h内的离子电导率和X射线衍射研究表明:颗粒度越小,晶化就越容易。整片非晶比粉末压片不仅电导率提高两个数量级,激活能明显降低,而且更难晶化、更稳定、更有应用意义。60目、120目和200目非晶粉末的差示扫描量热分析及其在300℃等温热处理330h期间和在350℃等温热处理612h后的离子电导率、X射线衍射和差热分析研究表明:该非晶相分离中存在比两个更多的非晶相和更复杂的非晶相之间的界面效应。
Ionic conductivity and activation energy of 60 meshpowder, 120 mesh-powder, 200 mesh-powder, tablet pressed with powder and bulk piece of amorphous lithium ionic conductor P2O5-0.7Li2O-0.4LiCl-0.10Al2O3in the range of 60℃-380℃ were investigated. It is found that decreasing the grain size can enhance ionic conductivity by 4 times and does not affect activation energy, owing to the effect of boundary layer in the same amorphous phase. Research after ionic conductivity measurement and X-ray diffraction of samples heated at 380℃ for 76 hours show that following the grain size becomes smaller, the crystallization process becomes easier. The bulk piece of amorphous sample not only has conductivity two orders higher than that of the tablet sample and lower activation energy, but also is more difficult to crystallize. Hence it possesses higher applicability. Study on DSC, conductivity, XRD and DTA of 60 mesh, 120 mesh, 200 mesh amorphous powder heated at 300℃ for 330 hours and at 350℃ for 612 hours shows that there are more than two amorphous phases and more complex interface effects among different phases in their amorphous phase separation.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第4期596-603,共8页
Acta Physica Sinica
