A high ionic conductive PDOL/LAGP composite solid electrolyte film for Interfacial Stable solid-state lithium batteries. Issue 3 (1st February 2023)

• Record Type: Journal Article
• Authors: Huang, Zhen-hao; Jing, Mao-xiang; Wang, Peng-qin; Shao, Wen-wen; Zhang, Zhi-peng; Zhang, Gang; Shen, Xiang-qian
• Is Part Of: Ceramics international. Volume 49:Issue 3(2023)
• Page Start: 5510
• Page End: 5517
• Publication Date: 2023-02-01
• Subjects: Solid-state lithium battery -- Composite solid electrolyte -- Interface -- LAGP -- Ion conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.10.074
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: High ionic conductivity for solid electrolyte and stable electrode/electrolyte interface have always been the main requirements for solid-state lithium batteries. Herein, a high ionic conductive composite solid electrolyte (CSE) film was prepared by combining 1.3-dioxolanes (DOL) capable of in-situ polymerization with high ionic conductive Li1.5 Al0.5 Ge1.5 (PO4 )3 (LAGP)ceramic fillers. The CSE film also shows high interface compatibility and stability with lithium metal. The optimized poly-DOL (PDOL)-30% LAGP CSE exhibits a desirable dense and uniform structure, which endows the CSE with a high ion conductivity of 4.63 × 10 −4 S cm −1, a high ion migration number up to 0.73 and a wide electrochemical stability window of 5.1 V. The assembled high-voltage NCM622/PDOL-30%LAGP CSE/Li solid-state cell exhibits good rate and cycle performances with a capacity of 125 mAh/g at 2 C and a capacity retention of 76% at 0.5C after 400 cycles with an average Coulomb efficiency of 99.7%. The PDOL-30%LAGP CSE also possesses a high inhibition ability of lithium dendrites owing to the dense and uniform structure and the stable electrolyte/lithium electrode interface including Li–Ge, LiF and CF3 components. The Li/CSE/Li cell maintains a relatively stable voltage up to 650 h at a current density of 0.1 mA/cm 2 . This high ionic conductive composite solid electrolyte film shows a good application prospect in high-voltage solid-state lithium batteries. Graphical abstract: Schematic diagram of the enhancement mechanism for ion transport and interface stability of the composite electrolyte. Image 1 Highlights: High ionic conductive PDOL/LAGP composite solid electrolyte film was achieved. This composite solid electrolyte provides high ion transport capacity and high electrochmical window. 3.The electrode/electrolyte interface stability was greatly improved by forming stable SEI composite film.