【摘要】 以无机固体电解质为隔膜的全固态锂离子电池被认为是传统锂离子电池安全问题的有效解决方案。钙钛矿型锂镧钛氧[Li_3xLa_2/3-xTiO₃（0.04<x<0.17）,LLTO]是离子电导率最高的氧化物固体电解质之一,但由于采用常规冷等静压方法制备的样品密度低,其离子电导率往往也很低。本文采用新型自致密烧结方法制备固体电解质,在1 150℃下空气中烧结30 h,成功得到相对密度达89%的Li_0.35La_0.505TiO₃固体电解质,其在30℃下的本体离子电导率达6.03×10^-4S·cm^-1,接近报道的最高值。晶格中4个间距为2.739?的相邻O原子构成Li⁺传输瓶颈。由于无需任何加压操作,大大简化了陶瓷类固体电解质制备过程。更多还原

【Abstract】 All-solid-state lithium ion battery employing inorganic solid-state electrolytes as separators is viewed as an effective solution to the safety issues of traditional lithium ion batteries.As one of the oxide solid electrolytes with the highest ionic conductivity,Pervoskite-type Li_3xLa_2/3-xTiO₃ [（0.04 <x<0.17）,LLTO] is usually prepared by cold isostatic pressing method,which often leads to low density and low ionic conductivity accordingly.In this paper,a novel method called "self-consolidation" is employed to prepare LLTO.Since no pressing operations are required,the preparation process was greatly simplified.After being sintered at 1 150 ℃ for 30 h in air,Li_0.35La_0.505TiO₃ sample with a relative density of 89% was prepared successfully.Its bulk ionic conductivity at 30℃ is as high as 6.03×10^-4 S·cm^-1,close to the highest reported values.In the crystalline structure,the bottle-neck of the conduction of Li⁺ is built by four O atoms with a distance of 2.739 ? between the neighbour ones.更多还原