Investigating the Degradation of LATP Solid Electrolyte in High Alkaline Li-$O_2$ Batteries
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915441476108288 |
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| author | Mishra, Tara P Li, Zhuohan Shen, Meghan Jaugstetter, Maximilian Matte, Livia P Park, Jung O. Kim, Hyunjin Lam, Benjamin X Bustillo, Karen Ceder, Gerbrand Scott, Mary |
| author_facet | Mishra, Tara P Li, Zhuohan Shen, Meghan Jaugstetter, Maximilian Matte, Livia P Park, Jung O. Kim, Hyunjin Lam, Benjamin X Bustillo, Karen Ceder, Gerbrand Scott, Mary |
| contents | In this study, we address the challenge of electrolyte degradation in all-solid-state humidified Li-$O_2$ batteries, which offer high theoretical energy density and potential cost advantages over conventional lithium-ion batteries. Combining STEM-EELS, and XPS characterizations with DFT calculations, we reveal the leaching of $(PO_4)^{3+}$ and $Al^{3+}$ ions from the $Li_{1.3}Al_{0.3}Ti_{1.7}(PO_4)_3$ (LATP) solid electrolyte upon battery discharge, caused by the highly alkaline environment. Upon charging, the leached ions precipitate as $Li_3PO_4$ and $AlPO_4$, which accumulate on the LATP surface and contribute to battery degradation. A Ti-rich layer is observed at the surface after a few cycles due to depletion of other cations. Our findings suggest that the degradation products are formed through repeated dissolution and precipitation in the discharge-charge cycles. Furthermore, our results indicate that the Ti-rich layer on the LATP surface can potentially reduce parasitic reactions. Our study provides mechanistic understanding of LATP solid electrolyte degradation in humidified Li-$O_2$ cell, paving the way for designing more durable and efficient Li-$O_2$ batteries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_08654 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating the Degradation of LATP Solid Electrolyte in High Alkaline Li-$O_2$ Batteries Mishra, Tara P Li, Zhuohan Shen, Meghan Jaugstetter, Maximilian Matte, Livia P Park, Jung O. Kim, Hyunjin Lam, Benjamin X Bustillo, Karen Ceder, Gerbrand Scott, Mary Materials Science In this study, we address the challenge of electrolyte degradation in all-solid-state humidified Li-$O_2$ batteries, which offer high theoretical energy density and potential cost advantages over conventional lithium-ion batteries. Combining STEM-EELS, and XPS characterizations with DFT calculations, we reveal the leaching of $(PO_4)^{3+}$ and $Al^{3+}$ ions from the $Li_{1.3}Al_{0.3}Ti_{1.7}(PO_4)_3$ (LATP) solid electrolyte upon battery discharge, caused by the highly alkaline environment. Upon charging, the leached ions precipitate as $Li_3PO_4$ and $AlPO_4$, which accumulate on the LATP surface and contribute to battery degradation. A Ti-rich layer is observed at the surface after a few cycles due to depletion of other cations. Our findings suggest that the degradation products are formed through repeated dissolution and precipitation in the discharge-charge cycles. Furthermore, our results indicate that the Ti-rich layer on the LATP surface can potentially reduce parasitic reactions. Our study provides mechanistic understanding of LATP solid electrolyte degradation in humidified Li-$O_2$ cell, paving the way for designing more durable and efficient Li-$O_2$ batteries. |
| title | Investigating the Degradation of LATP Solid Electrolyte in High Alkaline Li-$O_2$ Batteries |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.08654 |