In:
Batteries & Supercaps, Wiley, Vol. 7, No. 2 ( 2024-02)
Abstract:
Garnet solid‐state electrolytes (SSEs) Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12 (LLZTO) suffer from poor air stability, producing Li 2 CO 3 by‐products and causing poor interfacial contact against the Li metal. Obtaining hydrophobic and lithiophilic surface of LLZTO is meaningful for high‐performance solid‐state batteries. Here, a hydrophobic CF x film is firstly introduced on the LLZTO surface (CF x ‐LLZTO) by magnetron sputtering the polytetrafluoroethylene (PTFE) target. Benefit from its outstanding hydrophobicity, this CF x film provides the LLZTO a Li 2 CO 3 ‐free surface. Moreover, the LiC‐LiF mixed conductive interlayer is formed through the reaction between CF x film and Li metal, resulting in a low interfacial resistance of 73.49 Ω/cm 2 . In addition, the LiC‐LiF mixed conductive interlayer can also homogenize the electric‐field distribution and enable fast Li + conduction. As a result, the construction of the hydrophobic mixed conductive interlayer makes the CF x ‐LLZTO based symmetric Li/Li cell exhibit a high critical current density of 1.2 mA/cm 2 and a stable cycling life for over 1200 h at 0.1 mA/cm 2 . Furthermore, the Li/LiFePO 4 cells with the CF x ‐LLZTO show improved cycling and rate performance at room temperature. This work provides a practical solution for achieving high‐performance solid‐state lithium batteries.
Type of Medium:
Online Resource
ISSN:
2566-6223
,
2566-6223
DOI:
10.1002/batt.202300504
Language:
English
Publisher:
Wiley
Publication Date:
2024
detail.hit.zdb_id:
2897248-X
