The multicomponent synergistic effect of a hierarchical Li0.485La0.505TiO3 solid-state electrolyte for dendrite-free lithium-metal batteries. Issue 21 (23rd May 2022)

• Record Type: Journal Article
• Authors: Chen, Huanhui; Yu, Liang; Cao, Xing; Yang, Qixin; Liu, Ya; Wei, Yanru; Zeng, Junrong; Zhong, Liubiao; Qiu, Yejun
• Is Part Of: Nanoscale. Volume 14:Issue 21(2022)
• Page Start: 7768
• Page End: 7777
• Publication Date: 2022-05-23
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr01143c
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A novel percolation composite solid electrolyte that homogenizes the interfacial electric field and generates piezoelectricity was successfully prepared for uniform lithium deposition and lithium dendrite growth prevention. Abstract : Development of a composite electrolyte with high ionic conductivity, excellent electrochemical stability and preeminent mechanical strength is beneficial for suppressing Li-dendrite penetration and unstable interfacial reactions in solid-state Li-metal batteries. Herein, a novel composite electrolyte material comprising perovskite Li0.485 La0.505 TiO3 (LLTO), poly(ethylene oxide) (PEO), and a barium titanate (BTO)-polyimide (PI) composite matrix has been successfully fabricated. Benefiting from the well-defined ion channels, the resulting BTO-PI@LLTO-PEO-FEC-LiTFSI (BP@LPFL) exhibits excellent cycling stability, low interfacial resistance, enhanced mechanical strength, and high ionic conductivity. Particularly, BP@LPFL possesses an excellent ionic conductivity of 3.0 × 10 −4 S cm −1 at room temperature and achieves a wide electrochemical window of 5.2 V ( vs. Li + /Li). For Li-LiFePO4 batteries, such an ingenious structure yields a discharge capacity of 124 mA h g −1 at 0.1 C after 200 cycles at room temperature and delivers a discharge capacity of 165 mA h g −1 at 0.1 C after 110 cycles at 60 °C. Additionally, the symmetric Li cell remains stable after 700 h at a current density of 0.5 mA cm −2 . Furthermore, ex situ X-ray photoelectron spectroscopy and ex situ scanning electron microscopy were used to verify the interface evolution. Besides, a flexible full battery is fabricated, which exhibits impressive performance. These properties presented here provide support for BP@LPFL as a feasible candidate electrolyte for solid-state lithium batteries.