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Regulating Metal Centers of MOF-74 Promotes PEO-Based Electrolytes for All-Solid-State Lithium-Metal Batteries
- Source :
- ACS Applied Materials & Interfaces; April 2024, Vol. 16 Issue: 13 p16351-16362, 12p
- Publication Year :
- 2024
-
Abstract
- Poly(ethylene oxide) (PEO)-based electrolytes have been extensively studied for all-solid-state lithium-metal batteries due to their excellent film-forming capabilities and low cost. However, the limited ionic conductivity and poor mechanical strength of the PEO-based electrolytes cannot prevent the growth of undesirable lithium dendrites, leading to the failure of batteries. Metal–organic frameworks (MOFs) are functional materials with a periodic porous structure that can improve the electrochemical performance of PEO-based electrolytes. However, the enhancement effect of MOFs with different metal centers and the interaction mechanism with PEO remain unclear. Herein, MOF-74s with Cu or Ni centers are prepared and used as fillers of PEO-based electrolytes. Adding 15 wt % of Cu-MOF-74 to the PEO-based electrolyte (15%Cu-MOF/P–Li) effectively improves the ionic conductivity, lithium transference number, and mechanical strength of the PEO-based electrolyte simultaneously. Furthermore, the ordered pore channels of Cu-MOF-74 provide uniform Li-ion transport pathways, facilitating homogeneous Li+deposition. As a result, the lithium symmetric cell with 15%Cu-MOF/P–Li shows stable cycles for 1080 h at 0.1 mA cm–2and 0.1 mAh cm–2, and the Li | 15% Cu-MOF/P–Li | LFP full cell exhibits a long cycle life up to 200 cycles at 60 °C and 0.5 C, with a capacity retention rate of 89.7%.
Details
- Language :
- English
- ISSN :
- 19448244
- Volume :
- 16
- Issue :
- 13
- Database :
- Supplemental Index
- Journal :
- ACS Applied Materials & Interfaces
- Publication Type :
- Periodical
- Accession number :
- ejs65831875
- Full Text :
- https://doi.org/10.1021/acsami.4c01316