On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries
<p>Lithium metal self-diffusion is too slow to sustain large current densities at the interface with a solid electrolyte, and the resulting formation of voids on stripping is a major limiting factor for the power density of solid-state cells. The enhanced morphological stability of some lithiu...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Chemical Society
2022
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| _version_ | 1797108576097927168 |
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| author | Siniscalchi, M Liu, J Gibson, JS Turrell, SJ Aspinall, J Weatherup, RS Pasta, M Speller, SC Grovenor, CRM |
| author_facet | Siniscalchi, M Liu, J Gibson, JS Turrell, SJ Aspinall, J Weatherup, RS Pasta, M Speller, SC Grovenor, CRM |
| author_sort | Siniscalchi, M |
| collection | OXFORD |
| description | <p>Lithium metal self-diffusion is too slow to sustain large current densities at the interface with a solid electrolyte, and the resulting formation of voids on stripping is a major limiting factor for the power density of solid-state cells. The enhanced morphological stability of some lithium alloy electrodes has prompted questions on the role of lithium diffusivity in these materials. Here, the lithium diffusivity in Li-Mg alloys is investigated by an isotope tracer method, revealing that the presence of magnesium slows down the diffusion of lithium. For large stripping currents the delithiation process is diffusion-limited, hence a lithium metal electrode yields a larger capacity than a Li-Mg electrode. However, at lower currents we explain the apparent contradiction that more lithium can be extracted from Li-Mg electrodes by showing that the alloy can maintain a more geometrically stable diffusion path to the solid electrolyte surface so that the effective lithium diffusivity is improved.</p> |
| first_indexed | 2024-03-07T07:30:52Z |
| format | Journal article |
| id | oxford-uuid:ba6f03a1-7bd1-471d-8526-8634425e4ca6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:30:52Z |
| publishDate | 2022 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:ba6f03a1-7bd1-471d-8526-8634425e4ca62023-01-06T15:43:40ZOn the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteriesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ba6f03a1-7bd1-471d-8526-8634425e4ca6EnglishSymplectic ElementsAmerican Chemical Society2022Siniscalchi, MLiu, JGibson, JSTurrell, SJAspinall, JWeatherup, RSPasta, MSpeller, SCGrovenor, CRM<p>Lithium metal self-diffusion is too slow to sustain large current densities at the interface with a solid electrolyte, and the resulting formation of voids on stripping is a major limiting factor for the power density of solid-state cells. The enhanced morphological stability of some lithium alloy electrodes has prompted questions on the role of lithium diffusivity in these materials. Here, the lithium diffusivity in Li-Mg alloys is investigated by an isotope tracer method, revealing that the presence of magnesium slows down the diffusion of lithium. For large stripping currents the delithiation process is diffusion-limited, hence a lithium metal electrode yields a larger capacity than a Li-Mg electrode. However, at lower currents we explain the apparent contradiction that more lithium can be extracted from Li-Mg electrodes by showing that the alloy can maintain a more geometrically stable diffusion path to the solid electrolyte surface so that the effective lithium diffusivity is improved.</p> |
| spellingShingle | Siniscalchi, M Liu, J Gibson, JS Turrell, SJ Aspinall, J Weatherup, RS Pasta, M Speller, SC Grovenor, CRM On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title | On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title_full | On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title_fullStr | On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title_full_unstemmed | On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title_short | On the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid-state batteries |
| title_sort | on the relative importance of li bulk diffusivity and interface morphology in determining the stripped capacity of metallic anodes in solid state batteries |
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