Liao Yu-Kai, Tong Zizheng, Fang Chia-Chen, Liao Shih-Chieh, Chen Jin-Ming, Liu Ru-Shi, Hu Shu-Fen
Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
ACS Appl Mater Interfaces. 2021 Dec 1;13(47):56181-56190. doi: 10.1021/acsami.1c16922. Epub 2021 Nov 16.
All-solid-state Li-ion batteries (ASSLIBs), also known as next-generation batteries, have attracted much attention due to their high energy density and safety. The best advantage of ASSLIBs is the Li-metal anodes that could be used without safety issues. In this study, a highly conductive garnet solid electrolyte (LiLaZrTaO, LLZTO) was used in the ASSLIB, and a Pt film was used to modify the surface of LLZTO to prove the solution of the Li-metal anode for LLZTO. Li-Pt alloy was synthesized to improve the wettability and contact of the interface. The interfacial resistance was reduced by 21 times, at only 9 Ω cm. The symmetric cell could stably cycle over 3500 h at a current density of 0.1 mA cm. The full cell of Li|Li-Pt|LLZTO|LiFePO and Li|Li-Pt|LLZTO|LiMnFePO achieved high stability in terms of battery performance. Point-to-point contact transformed into homogeneous surface contact made the Li-ion flux faster and more stable. This surface modification method could provide researchers with a new choice for fixing interface issues and promoting the application of high-performance ASSLIBs in the future.
全固态锂离子电池（ASSLIBs），也被称为下一代电池，因其高能量密度和安全性而备受关注。ASSLIBs的最大优势在于其锂金属负极在使用时不存在安全问题。在本研究中，一种高导电性的石榴石型固体电解质（LiLaZrTaO，LLZTO）被用于ASSLIBs中，并且使用铂膜对LLZTO表面进行改性，以验证锂金属负极与LLZTO的适配性。合成了锂 - 铂合金以改善界面的润湿性和接触性。界面电阻降低了21倍，仅为9Ω·cm²。对称电池在0.1 mA·cm²的电流密度下能够稳定循环超过3500小时。Li|Li - Pt|LLZTO|LiFePO和Li|Li - Pt|LLZTO|LiMnFePO的全电池在电池性能方面实现了高稳定性。点对点接触转变为均匀的表面接触使得锂离子通量更快且更稳定。这种表面改性方法可为研究人员解决界面问题以及未来推动高性能ASSLIBs的应用提供新的选择。
