无定型锂镧锆氧固态电解质薄膜的制备及其性能

Preparation and performance of amorphous LLZO solid-state electrolyte thin-films

为探究溶胶-凝胶前驱体对锂镧锆氧(LLZO)无定型固态电解质薄膜性能的影响,分别以硝酸盐、金属醇盐为原料,通过多次旋涂和低温退火工艺制备锂离子传导无定型薄膜电解质;采用XRD、TEM、SEM、AFM等物理表征及电化学方法探究电解质薄膜的结构、形貌及电化学性能。结果表明:2种前驱体制备的固态电解质薄膜主要为无定型结构;采用金属醇盐制备的锂镧锆氧薄膜表面更为致密平滑,室温下其锂离子电导率为3.94×10^(-7)S/cm,而采用硝酸盐前驱体制备的锂镧锆氧薄膜固态电解质的离子电导率仅为9.75×10^(-8)S/cm,说明以金属醇盐前驱体制备的锂镧锆氧薄膜电解质具有更优的结构和形貌,以及更高的电化学性能。

In order to explore the influence of sol-gel precursor on the performance of amorphous solid-state electrolyte(SSE)thin-films of Li-La-Zr-O(LLZO),nitrate and metal alkoxide are used as raw materials to prepare the amorphous SSE thin-films of LLZO through multiple spin-coating and low-temperature annealing processes.XRD,TEM,SEM,AFM and other physical characterization and electrochemical methods were used to explore the structure,morphology,and electrochemical properties of the SSE film.The results show that the structure for both the SSE thin-films of LLZO prepared by the two routes are mainly amorphous.The surface of the amorphousLLZO thin-films prepared by metal alkoxide precursor appears more denser and smooth,and its ionic conductivity is 3.94×10^(-7)S/cm at room temperature,significantly higher than that of the film prepared by the nitrate precursor route(9.75×10^(-8)S/cm).It illustrates that the metal alkoxide precursor route can achieve a superior structure,morphology and electrochemical performance for the preparation of the SSE thin-films of LLZO.