ZHU Bao-jun1，TAO Ying2， WANG Wei1,LI Yu-ping1，CHEN Shi-lin1
（1.College of Materials Science and Engineering, Hunan Univ, Changsha,Hunan410082，China;2.College of Materials Science and Engineering, Central South Univ, Changsha,Hunan410083,China) 在知网中查找 在百度中查找 在本站中查找
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摘要:
采用固相合成法制备了Li3PO4-LiAlO2固态锂离子电解质材料.研究了摩尔配比、煅烧温度对产物相组成、颗粒形貌、电性能的影响.结果表明：当P/Al化学计量比为1∶1时，煅烧后试样中存在片状的γ-LiAlO2和球状的γ-Li3PO4两相，粒径约为0.5~1 μm.当P/Al化学计量比为3∶1时，煅烧后试样主要是Al掺杂的球状γ-Li3PO4固溶体.此样品1 000 ℃煅烧后，离子电导率为6.4×10-5S/cm，说明Al掺杂能有效提高γ-Li3PO4无机固体电解质离子电导率.1 100 ℃煅烧后，样品锂离子电导率降低.循环伏安曲线研究表明，Al掺杂γ-Li3PO4无机固体电解质样品在饱和LiNO3水溶液中具有较好的可逆性，其电化学窗口达到1.5 V.
A series of LiAlO2-Li3PO4 solid state lithium ion electrolyte materials were prepared through solid-phase reaction. The influences of experimental operating parameters such as the Molar ratio of materials, and the sintering temperature on the characteristics of the sintered samples were investigated. The results showed that, at 1∶1 stoichiometric ratio of LiAlO2 and Li3PO4, the specimens sintered at 1 000 ℃ consisted of γ-LiAlO2 flakes and γ-Li3PO4 spheres, and the sizes of particles ranged from 0.5 to 1 μm. When the stoichiometric ratio of LiAlO2 and Li3PO4 was 1∶3, the specimens sintered at 1 000 ℃ consisted of mainly Al doped spherical γ-Li3PO4 solid solution and its ionic conductivity was 6.4×10-5 S/cm. It indicated that Al doping could effectively improve the ionic conductivity of Li3PO4 inorganic solid electrolyte. When the Al doped specimens were sintered at 1 100 ℃, the ionic conductivity decreased. The results of cyclic voltammetry showed that the Al doped γ-Li3PO4 solid electrolyte materials had a good electrochemical reversibility in saturated LiNO3 solution, and an electrochemical window of 1.5V was observed.
