Evidence of Transition-Metal Accumulation on Aged Graphite Anodes by SIMS
| Autor: | T. Spila, M.M. Furczon, Daniel P. Abraham, Ernie Sammann |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry Oxide Analytical chemistry Electrochemistry Secondary ion mass spectrometry chemistry.chemical_compound chemistry Transition metal Electrode General Materials Science Graphite Electrical and Electronic Engineering Physical and Theoretical Chemistry Dissolution Cell aging |
| Zdroj: | Electrochemical and Solid-State Letters. 11:A226 |
| ISSN: | 1099-0062 |
| DOI: | 10.1149/1.2987680 |
| Popis: | In cells containing Li{sub 1.05}(Ni{sub 1/3}Co{sub 1/3}Mn{sub 1/3}){sub 0.95}O{sub 2}-based positive and graphite-based negative electrodes, a significant portion of cell impedance rise on aging is known to be from the negative electrode. One possible reason for this impedance rise is the dissolution of transition-metal elements from the oxide electrode that accumulate and create a high-impedance layer at the negative electrode-electrolyte interface. This article details dynamic secondary ion mass spectrometry (SIMS) measurements, which provide a relative comparison of Mn, Co, and Ni contents on fresh, formed, and aged graphite electrodes. The data clearly indicate that these transition-metal elements accumulate at the electrode surface and diffuse into the electrode during cell aging. |
| Databáze: | OpenAIRE |
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