设计并制备了PEO-LATP/LAGP陶瓷复合电解质. 使用NASICON结构的Li1.4Al0.4Ti1.6(PO4)3 (LATP)或 Li1.5Al0.5Ge1.5(PO4)3 (LAGP)作为陶瓷基体, 以PEO为粘结剂, 得到了均匀、厚度仅为20 μm的复合电解质膜. 通过电化学性能表征发现当w(LATP/LAGP):w(PEO)=7:3时, 复合电解质膜具有最高的室温电导率, 达到0.186 mS/cm (PEO-LATP)与0.111 mS/cm (PEO-LAGP). 通过充放电循环实验表明, Li/复合电解质/LiCo1/3Ni1/3Mn1/3O2电池的首次放电容量达170 mAh/g. 使用PEO-LATP复合电解质的电池在循环时有较大的容量衰减, 而使用PEO-LAGP复合电解质则循环性能有明显的改善, 在10次循环后仍保持在150 mAh/g.
A PEO-LATP/LAGP composite electrolyte for lithium batteries was designed and prepared. Uniformly composite electrolyte membrane with thickness of 20 μm was obtained by assembling Li1.4Al0.4Ti1.6(PO4)3 (LATP) or Li1.5Al0.5Ge1.5(PO4)3 (LAGP) as ceramic substrate and PEO as binder. Highest room-temperature conductivities were achieved for the sample prepared with w(ceramics):w(PEO)=7:3. Electrochemical analysis showed that the conductivity reached 0.186 mS/cm for PEO-LATP and 0.111 mS/cm for PEO-LAGP. Cycling performances of 170 mAh/g was obtained for the first discharge capacity of the Li/composite electrolyte/LiCo1/3Ni1/3Mn1/3O2 cell. Sharp decrease of cycling capacity was observed for the cell using PEO-LATP membrane. The cycling performance of the PEO-LAGP based cell was greatly improved with 150 mAh/g remained after 10 cycles.
参考文献
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