Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries

Summary: Li metal anodes are enticing for batteries due to high theoretical charge storage capacity, but commercialization is plagued by dendritic Li growth and short circuits when cycled at high currents. Applied pressure has been suggested to improve morphology, and therefore performance. We hypot...

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Autores principales:	Katharine L. Harrison, Laura C. Merrill, Daniel Martin Long, Steven J. Randolph, Subrahmanyam Goriparti, Joseph Christian, Benjamin Warren, Scott A. Roberts, Stephen J. Harris, Daniel L. Perry, Katherine L. Jungjohann
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Electrochemical energy storage Materials science Materials chemistry Materials characterization Materials characterization techniques Energy materials Science Q
Acceso en línea:	https://doaj.org/article/370c58539cc3400091e173b98d23edac
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spelling	oai:doaj.org-article:370c58539cc3400091e173b98d23edac2021-11-26T04:37:31ZCryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries2589-004210.1016/j.isci.2021.103394https://doaj.org/article/370c58539cc3400091e173b98d23edac2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2589004221013651https://doaj.org/toc/2589-0042Summary: Li metal anodes are enticing for batteries due to high theoretical charge storage capacity, but commercialization is plagued by dendritic Li growth and short circuits when cycled at high currents. Applied pressure has been suggested to improve morphology, and therefore performance. We hypothesized that increasing pressure would suppress dendritic growth at high currents. To test this hypothesis, here, we extensively use cryogenic scanning electron microscopy to show that varying the applied pressure from 0.01 to 1 MPa has little impact on Li morphology after one deposition. We show that pressure improves Li density and preserves Li inventory after 50 cycles. However, contrary to our hypothesis, pressure exacerbates dendritic growth through the separator, promoting short circuits. Therefore, we suspect Li inventory is better preserved in cells cycled at high pressure only because the shorts carry a larger portion of the current, with less being carried by electrochemical reactions that slowly consume Li inventory.Katharine L. HarrisonLaura C. MerrillDaniel Martin LongSteven J. RandolphSubrahmanyam GoripartiJoseph ChristianBenjamin WarrenScott A. RobertsStephen J. HarrisDaniel L. PerryKatherine L. JungjohannElsevierarticleElectrochemical energy storageMaterials scienceMaterials chemistryMaterials characterizationMaterials characterization techniquesEnergy materialsScienceQENiScience, Vol 24, Iss 12, Pp 103394- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Electrochemical energy storage Materials science Materials chemistry Materials characterization Materials characterization techniques Energy materials Science Q
spellingShingle	Electrochemical energy storage Materials science Materials chemistry Materials characterization Materials characterization techniques Energy materials Science Q Katharine L. Harrison Laura C. Merrill Daniel Martin Long Steven J. Randolph Subrahmanyam Goriparti Joseph Christian Benjamin Warren Scott A. Roberts Stephen J. Harris Daniel L. Perry Katherine L. Jungjohann Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
description	Summary: Li metal anodes are enticing for batteries due to high theoretical charge storage capacity, but commercialization is plagued by dendritic Li growth and short circuits when cycled at high currents. Applied pressure has been suggested to improve morphology, and therefore performance. We hypothesized that increasing pressure would suppress dendritic growth at high currents. To test this hypothesis, here, we extensively use cryogenic scanning electron microscopy to show that varying the applied pressure from 0.01 to 1 MPa has little impact on Li morphology after one deposition. We show that pressure improves Li density and preserves Li inventory after 50 cycles. However, contrary to our hypothesis, pressure exacerbates dendritic growth through the separator, promoting short circuits. Therefore, we suspect Li inventory is better preserved in cells cycled at high pressure only because the shorts carry a larger portion of the current, with less being carried by electrochemical reactions that slowly consume Li inventory.
format	article
author	Katharine L. Harrison Laura C. Merrill Daniel Martin Long Steven J. Randolph Subrahmanyam Goriparti Joseph Christian Benjamin Warren Scott A. Roberts Stephen J. Harris Daniel L. Perry Katherine L. Jungjohann
author_facet	Katharine L. Harrison Laura C. Merrill Daniel Martin Long Steven J. Randolph Subrahmanyam Goriparti Joseph Christian Benjamin Warren Scott A. Roberts Stephen J. Harris Daniel L. Perry Katherine L. Jungjohann
author_sort	Katharine L. Harrison
title	Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
title_short	Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
title_full	Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
title_fullStr	Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
title_full_unstemmed	Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries
title_sort	cryogenic electron microscopy reveals that applied pressure promotes short circuits in li batteries
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/370c58539cc3400091e173b98d23edac
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Cryogenic electron microscopy reveals that applied pressure promotes short circuits in Li batteries

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