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Unveiling the mechanisms of lithium dendrite suppression by cationic polymer film induced solid-electrolyte interphase modification

Title
Unveiling the mechanisms of lithium dendrite suppression by cationic polymer film induced solid-electrolyte interphase modification
Author
이승용
Keywords
ELECTROCHEMICAL LIQUID CELL; MICROSCOPY OBSERVATION; ION BATTERIES; METAL ANODES; IN-SITU; CARBONATE; INTERFACES; BEHAVIOR; POLYELECTROLYTE; REDUCTION
Issue Date
2020-05
Publisher
ROYAL SOC CHEMISTRY
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v. 13, no. 6, page. 1832-1842
Abstract
It is crucial to suppress lithium dendrite formation in lithium metal batteries. Formation of a good solid-electrolyte interphase (SEI) has been considered to be effective in limiting lithium dendrite growth. However, how the SEI may be modified during lithium deposition is hard to resolve due to challenges inin situinvestigation of the SEI with fine details. We report anin situstudy that uncovers the lithium dendrite suppression mechanism arising from SEI modification by a poly(diallyldimethylammonium chloride) (PDDA) cationic polymer film, using electrochemical liquid cell transmission electron microscopy (TEM). Lithium nanogranules are obtained in the presence of the polymer film. Chemical mapping of the deposits provides remarkable details of the SEI on individual nanogranules. It shows that lithium fluorides are uniformly distributed within the inner SEI layer of individual lithium nanogranules, arising from the instantaneous reaction of the deposited lithium with PF(6)(-)ions accumulated by the cationic polymer film, and thus the dendritic growth of lithium is prohibited. The ability to directly measure SEI chemistry at the nanoscale down to the individual nanograinsin situand unveil its correlation with the lithium deposition behavior opens future opportunities to explore unsolved mechanisms in batteries.
URI
https://pubs.rsc.org/en/content/articlelanding/2020/EE/D0EE00518Ehttps://repository.hanyang.ac.kr/handle/20.500.11754/166445
ISSN
1754-5692; 1754-5706
DOI
10.1039/d0ee00518e
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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