Self-heating-induced healing of lithium dendrites
Lithium (Li) metal electrodes are not deployable in rechargeable batteries because electrochemical plating and stripping invariably leads to growth of dendrites that reduce coulombic efficiency and eventually short the battery. It is generally accepted that the dendrite problem is exacerbated at hig...
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| Veröffentlicht in: | Science (American Association for the Advancement of Science) 2018-03, Vol.359 (6383), p.1513-1516 |
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| container_title | Science (American Association for the Advancement of Science) |
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| creator | Li, Lu Basu, Swastik Wang, Yiping Chen, Zhizhong Hundekar, Prateek Wang, Baiwei Shi, Jian Shi, Yunfeng Narayanan, Shankar Koratkar, Nikhil |
| description | Lithium (Li) metal electrodes are not deployable in rechargeable batteries because electrochemical plating and stripping invariably leads to growth of dendrites that reduce coulombic efficiency and eventually short the battery. It is generally accepted that the dendrite problem is exacerbated at high current densities. Here, we report a regime for dendrite evolution in which the reverse is true. In our experiments, we found that when the plating and stripping current density is raised above ~9 milliamperes per square centimeter, there is substantial self-heating of the dendrites, which triggers extensive surface migration of Li. This surface diffusion heals the dendrites and smoothens the Li metal surface. We show that repeated doses of high-current-density healing treatment enables the safe cycling of Li-sulfur batteries with high coulombic efficiency. |
| doi_str_mv | 10.1126/science.aap8787 |
| format | Article |
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It is generally accepted that the dendrite problem is exacerbated at high current densities. Here, we report a regime for dendrite evolution in which the reverse is true. In our experiments, we found that when the plating and stripping current density is raised above ~9 milliamperes per square centimeter, there is substantial self-heating of the dendrites, which triggers extensive surface migration of Li. This surface diffusion heals the dendrites and smoothens the Li metal surface. We show that repeated doses of high-current-density healing treatment enables the safe cycling of Li-sulfur batteries with high coulombic efficiency.</description><identifier>ISSN: 0036-8075</identifier><identifier>EISSN: 1095-9203</identifier><identifier>DOI: 10.1126/science.aap8787</identifier><identifier>PMID: 29599241</identifier><language>eng</language><publisher>United States: The American Association for the Advancement of Science</publisher><subject>Batteries ; Current density ; Dendrites ; Electrochemistry ; Healing ; Heat ; Heating ; High current ; Lithium ; Lithium batteries ; Metals ; Rechargeable batteries ; Stripping ; Sulfur ; Surface diffusion</subject><ispartof>Science (American Association for the Advancement of Science), 2018-03, Vol.359 (6383), p.1513-1516</ispartof><rights>Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. 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| source | JSTOR Archive Collection A-Z Listing; American Association for the Advancement of Science |
| subjects | Batteries Current density Dendrites Electrochemistry Healing Heat Heating High current Lithium Lithium batteries Metals Rechargeable batteries Stripping Sulfur Surface diffusion |
| title | Self-heating-induced healing of lithium dendrites |
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