The effect of volume change and stack pressure on solid-state battery cathodes
Solid-state lithium batteries may provide increased energy density and improved safety compared with Li-ion technology. However, in a solid-state composite cathode, mechanical degradation due to repeated cathode volume changes during cycling may occur, which may be partially mitigated by applying a...
| Prif Awduron: | , , , , , , , , , |
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| Fformat: | Journal article |
| Iaith: | English |
| Cyhoeddwyd: |
Wiley
2023
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| _version_ | 1826311521307721728 |
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| author | Liu, B Pu, SD Doerrer, C Spencer Jolly, D House, RA Melvin, DLR Adamson, P Grant, PS Gao, X Bruce, PG |
| author_facet | Liu, B Pu, SD Doerrer, C Spencer Jolly, D House, RA Melvin, DLR Adamson, P Grant, PS Gao, X Bruce, PG |
| author_sort | Liu, B |
| collection | OXFORD |
| description | Solid-state lithium batteries may provide increased energy density and improved safety compared with Li-ion technology. However, in a solid-state composite cathode, mechanical degradation due to repeated cathode volume changes during cycling may occur, which may be partially mitigated by applying a significant, but often impractical, uniaxial stack pressure. Herein, we compare the behavior of composite electrodes based on Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) (negligible volume change) and Nb<sub>2</sub>O<sub>5</sub> (+4% expansion) cycled at different stack pressures. The initial LTO capacity and retention are not affected by pressure but for Nb<sub>2</sub>O<sub>5</sub>, they are significantly lower when a stack pressure of <2 MPa is applied, due to inter-particle cracking and solid-solid contact loss because of cyclic volume changes. This work confirms the importance of cathode mechanical stability and the stack pressures for long-term cyclability for solid-state batteries. This suggests that low volume-change cathode materials or a proper buffer layer are required for solid-state batteries, especially at low stack pressures. |
| first_indexed | 2024-03-07T08:11:05Z |
| format | Journal article |
| id | oxford-uuid:6970d26c-5c7a-4aa7-b7ad-45f91e8bf9e9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:11:05Z |
| publishDate | 2023 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:6970d26c-5c7a-4aa7-b7ad-45f91e8bf9e92023-11-24T16:37:47ZThe effect of volume change and stack pressure on solid-state battery cathodesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6970d26c-5c7a-4aa7-b7ad-45f91e8bf9e9EnglishSymplectic ElementsWiley2023Liu, BPu, SDDoerrer, CSpencer Jolly, DHouse, RAMelvin, DLRAdamson, PGrant, PSGao, XBruce, PGSolid-state lithium batteries may provide increased energy density and improved safety compared with Li-ion technology. However, in a solid-state composite cathode, mechanical degradation due to repeated cathode volume changes during cycling may occur, which may be partially mitigated by applying a significant, but often impractical, uniaxial stack pressure. Herein, we compare the behavior of composite electrodes based on Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) (negligible volume change) and Nb<sub>2</sub>O<sub>5</sub> (+4% expansion) cycled at different stack pressures. The initial LTO capacity and retention are not affected by pressure but for Nb<sub>2</sub>O<sub>5</sub>, they are significantly lower when a stack pressure of <2 MPa is applied, due to inter-particle cracking and solid-solid contact loss because of cyclic volume changes. This work confirms the importance of cathode mechanical stability and the stack pressures for long-term cyclability for solid-state batteries. This suggests that low volume-change cathode materials or a proper buffer layer are required for solid-state batteries, especially at low stack pressures. |
| spellingShingle | Liu, B Pu, SD Doerrer, C Spencer Jolly, D House, RA Melvin, DLR Adamson, P Grant, PS Gao, X Bruce, PG The effect of volume change and stack pressure on solid-state battery cathodes |
| title | The effect of volume change and stack pressure on solid-state battery cathodes |
| title_full | The effect of volume change and stack pressure on solid-state battery cathodes |
| title_fullStr | The effect of volume change and stack pressure on solid-state battery cathodes |
| title_full_unstemmed | The effect of volume change and stack pressure on solid-state battery cathodes |
| title_short | The effect of volume change and stack pressure on solid-state battery cathodes |
| title_sort | effect of volume change and stack pressure on solid state battery cathodes |
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