Kim Minji, Kim Gwanhyeon, Lee Heechul
Department of Advanced Materials Engineering, Korea Polytechnic University, Gyeonggi 15073, Korea.
Micromachines (Basel). 2021 Jan 27;12(2):134. doi: 10.3390/mi12020134.
The rapidly growing Li-ion battery market has generated considerable demand for Li-ion batteries with improved performance and stability. All-solid-state Li-ion batteries offer promising safety and manufacturing enhancements. Herein, we examine the effect of substitutional doping at three cation sites in garnet-type LiLaZrO (LLZO) oxide ceramics produced by a sol-gel synthesis technique with the aim of enhancing the properties of solid-state electrolytes for use in all-solid-state Li-ion batteries. Building on the results of mono-doping experiments with different doping elements and sites-Al, Ga, and Ge at the Li site; Rb at the La site; and Ta and Nb at the Zr site-we designed co-doped (Ga, Al, or Rb with Nb) and tri-doped (Ga or Al with Rb and Nb) samples by compositional optimization, and achieved a LLZO ceramic with a pure cubic phase, almost no secondary phase, uniform grain structure, and excellent Li-ion conductivity. The findings extend the current literature on the doping of LLZO ceramics and highlight the potential of the sol-gel method for the production of solid-state electrolytes.
快速增长的锂离子电池市场对性能和稳定性得到改善的锂离子电池产生了巨大需求。全固态锂离子电池有望在安全性和制造工艺方面实现提升。在此，我们研究了通过溶胶 - 凝胶合成技术制备的石榴石型LiLaZrO（LLZO）氧化物陶瓷中三个阳离子位点的替代掺杂效应，目的是增强用于全固态锂离子电池的固态电解质的性能。基于不同掺杂元素和位点的单掺杂实验结果——Li位点的Al、Ga和Ge；La位点的Rb；以及Zr位点的Ta和Nb——我们通过成分优化设计了共掺杂（Ga、Al或Rb与Nb）和三掺杂（Ga或Al与Rb和Nb）样品，并制备出了具有纯立方相、几乎没有第二相、晶粒结构均匀且锂离子电导率优异的LLZO陶瓷。这些发现扩展了当前关于LLZO陶瓷掺杂的文献，并突出了溶胶 - 凝胶法在生产固态电解质方面的潜力。
