HKUST-1@IL-Li Solid-state Electrolyte with 3D Ionic Channels and Enhanced Fast Li+ Transport for Lithium Metal Batteries at High Temperature
- Authors
- Li, Man; Chen, Tao; Song, Seunghyun; Li, Yang; Bae, Joonho
- Issue Date
- Mar-2021
- Publisher
- MDPI
- Keywords
- 3D ionic nanochannel; Composite solid electrolyte; High ionic transference number; High temperature; Solid‐state lithium metal batteries
- Citation
- Nanomaterials, v.11, no.3
- Journal Title
- Nanomaterials
- Volume
- 11
- Number
- 3
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/80641
- DOI
- 10.3390/nano11030736
- ISSN
- 2079-4991
- Abstract
- The challenge of safety problems in lithium batteries caused by conventional electrolytes at high temperatures is addressed in this study. A novel solid electrolyte (HKUST‐1@IL‐Li) was fabricated by immobilizing ionic liquid ([EMIM][TFSI]) in the nanopores of a HKUST‐1 metal– organic framework. 3D angstrom‐level ionic channels of the metal–organic framework (MOF) host were used to restrict electrolyte anions and acted as “highways” for fast Li+ transport. In addition, lower interfacial resistance between HKUST‐1@IL‐Li and electrodes was achieved by a wetted contact through open tunnels at the atomic scale. Excellent high thermal stability up to 300 °C and electrochemical properties are observed, including ionic conductivities and Li+ transference numbers of 0.68 × 10‐4 S∙cm‐1 and 0.46, respectively, at 25 °C, and 6.85 × 10‐4 S∙cm‐1 and 0.68, respectively, at 100 °C. A stable Li metal plating/stripping process was observed at 100 °C, suggesting an effectively suppressed growth of Li dendrites. The as‐fabricated LiFePO4/HKUST‐ 1@IL‐Li/Li solid‐state battery exhibits remarkable performance at high temperature with an initial discharge capacity of 144 mAh g‐1 at 0.5 C and a high capacity retention of 92% after 100 cycles. Thus, the solid electrolyte in this study demonstrates promising applicability in lithium metal batteries with high performance under extreme thermal environmental conditions. © 2021 by the author. Licensee MDPI, Basel, Switzerland.
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