A pioneer research for preparation of garnet-type solid electrolyte using sol-gel method

研究了溶胶-凝胶法制备Li7La3Zr2O12 （LLZ）固体电解质。通过对乙酸、水、醇、乙酸锂和乙酸镧等原料的浓度进行优化，成功制备了一种用于LLZ的前驱体溶胶。众所周知，与四方相相比，立方LLZ具有较高的锂离子电导率。将前驱体在1100℃煅烧得到立方LLZ，比常规方法低130℃。随后，还尝试用NH3制备LLZ的碱性前驱体溶胶。在碱性前驱体溶胶中，发现凝胶化速度比酸性溶胶快得多，使我们减少了制备时间。

A preparation of Li7La3Zr2O12 (LLZ) solid electrolyte via a sol-gel method was examined. A precursor sol for the LLZ was successfully prepared by an optimization of ingredient concentration, i.e. acetic acid, water, alcohol, lithium acetate and lanthanum acetate. It has been well known a cubic LLZ possesses high lithium ion conductivity compared with its tetragonal phase. The cubic LLZ could be obtained by a calcination of the precursor at 1100oC which was 130oC lower than conventional methods.Subsequently, a preparation of basic precursor sol for LLZ was also attempted by using NH3. In the basic precursor sol, it was found that a rate of gelation was much faster than that of the acidic sol, allowing us to reduce a preparation time.