Cryogenic Laser Ablation Reveals Short-Circuit Mechanism in Lithium Metal Batteries
| Autor: | Katharine L. Harrison, Kevin R. Zavadil, Laura C. Merrill, David W. Johnson, Steven Randolph, Subrahmanyam Goriparti, Katherine L. Jungjohann, Renae N. Gannon, Stephen J. Harris |
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| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Laser ablation Materials science Renewable Energy Sustainability and the Environment business.industry Energy Engineering and Power Technology chemistry.chemical_element Electrolyte Anode Fuel Technology chemistry Affordable and Clean Energy Chemistry (miscellaneous) Materials Chemistry Optoelectronics Lithium business Electroplating Short circuit Separator (electricity) |
| Zdroj: | ACS Energy Letters, vol 6, iss 6 |
| Popis: | Author(s): Jungjohann, KL; Gannon, RN; Goriparti, S; Randolph, SJ; Merrill, LC; Johnson, DC; Zavadil, KR; Harris, SJ; Harrison, KL | Abstract: The dramatic 50% improvement in energy density that Li-metal anodes offer in comparison to graphite anodes in conventional lithium (Li)-ion batteries cannot be realized with current cell designs because of cell failure after a few cycles. Often, failure is caused by Li dendrites that grow through the separator, leading to short circuits. Here, we used a new characterization technique, cryogenic femtosecond laser cross sectioning and subsequent scanning electron microscopy, to observe the electroplated Li-metal morphology and the accompanying solid electrolyte interphase (SEI) into and through the intact coin cell battery's separator, gradually opening pathways for soft-short circuits that cause failure. We found that separator penetration by the SEI guided the growth of Li dendrites through the cell. A short-circuit mechanism via SEI growth at high current density within the separator is provided. These results will inform future efforts for separator and electrolyte design for Li-metal anodes. |
| Databáze: | OpenAIRE |
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