Li2ZrF6 protective layer enabled high-voltage LiCoO2 positive electrode in sulfide all-solid-state batteries
Abstract The application of high-voltage positive electrode materials in sulfide all-solid-state lithium batteries is hindered by the limited oxidation potential of sulfide-based solid-state electrolytes (SSEs). Consequently, surface coating on positive electrode materials is widely applied to allev...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-01-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-024-55695-9 |
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| Summary: | Abstract The application of high-voltage positive electrode materials in sulfide all-solid-state lithium batteries is hindered by the limited oxidation potential of sulfide-based solid-state electrolytes (SSEs). Consequently, surface coating on positive electrode materials is widely applied to alleviate detrimental interfacial reactions. However, most coating layers also react with sulfide-based SSEs, generating electronic conductors and causing gradual interface degradation and capacity fading. To address this, we propose a Li2ZrF6 coating layer on LiCoO2, which exhibits minimal reaction with SSEs, and its decomposition products are electron-conductive-free. Furthermore, this coating layer also efficiently mitigates the layered-to-spinel/rock-salt surface structural transformation in LiCoO2. As a result, the In-Li|Li6PS5Cl | Li2ZrF6-LiCoO2 all-solid-state cell demonstrates an initial areal capacity of 5.2 mAh cm−2 and a capacity retention of 80.5% after 1500 cycles at 70 mA/g with high LiCoO2 areal mass loading (30.19 mg cm−2) and a cut-off voltage of 3.9 V (corresponding to potential of 4.5 V versus Li+/Li), at 25 °C. |
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| ISSN: | 2041-1723 |