材料科学
水分
离子电导率
电解质
锂(药物)
电化学
电导率
离子键合
化学工程
含水量
晶界
复合材料
离子
电极
微观结构
化学
物理化学
有机化学
医学
岩土工程
工程类
内分泌学
作者
Hongpeng Zheng,Guoyao Li,Jiqiong Liu,Si Wu,Xingmin Zhang,Yongmin Wu,Hong Zhu,Xiao Huang,Hezhou Liu,Huanan Duan
标识
DOI:10.1016/j.ensm.2022.04.027
摘要
Lithium-stuffed garnets, one of the most promising solid electrolytes for all-solid-state lithium batteries (ASSLBs), are typically vulnerable to water or moisture. In this work, Li6.5La3Zr1.5Ta0.5O12 (LLZT) with ionic conductivity of 7.36 × 10−4 S cm−1 at room temperature and ultrahigh moisture stability is designed and synthesized by a solvent-free route with no excess lithium source. After storing in ambient atmosphere for four months, the LLZT maintains an ionic conductivity of 6.41 × 10−4 S cm−1. With optimized lithium contents, the LLZT is stored in an atmosphere rich in H2O and CO2 at 65°C for 24 hours and the ionic conductivity only decreases by 6.9% to 6.6 × 10−4 S cm−1. Even undergone water-immersion, the LLZT pellet shows good electrochemical stability, which allows an interfacial resistance of 14.6 Ω cm2 with Li and stable cycling performance of Li|LLZT|LFP cell, exhibiting a high capacity retention of 93% after 100 cycles. Several important features including high relative density, few grain boundaries, water-stable secondary phase of La2Zr2O7, and the Li+-deficient garnet lattice are combined to contribute to the moisture stability as suggested by morphology and surface chemistry analysis and first-principles calculations. This study provides valuable insights into synthesizing fast and moisture-stable lithium garnets in a time-efficient way, which is vital for developing garnet-based ASSLBs.
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