Moharana, Sanghamitra, West, Geoff, Walker, Marc, Yan, Xinjie S. and Loveridge, Melanie (2022) Controlling Li dendritic growth in graphite anodes by potassium electrolyte additives for Li-ion batteries. ACS Applied Materials & Interfaces, 14 (37). pp. 42078-42092. doi:10.1021/acsami.2c11175 ISSN 1944-8244.

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Abstract

Fast charging promotes Li dendrite formation and its growth on graphite anodes, which affects cell performance in Li-ion batteries (LIBs). This work reports the formation of a robust SEI layer by introducing a KPF6 inorganic additive into the electrolyte. An optimal concentration of 0.001 M KPF6 effectively inhibits the growth of Li dendrites at 2C charging rates, compared with a commercial electrolyte. Electrolytes containing a KPF6 additive are shown here to deliver dual effects to mitigate the growth of dendrites. A thin LiF-rich SEI layer is formed on graphite, which blocks the electron leakage pathways. Additionally, K+ resides at defect sites (such as particle boundaries) due to its faster diffusion rate and blocks the incoming Li+ and restricts the growth of Li dendrites. The electrolyte with optimum concentration of KPF6, i.e., 0.001 M, effectively directs Li+ transport through the thin, durable, and low resistance LiF-rich SEI layer. This has implications for fast charging through optimization of the electrode/electrolyte interphase by controlling additive concentrations.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Lithium ion batteries , Lithium ion batteries -- Materials, Dendrites -- Growth , Electrodes -- Materials, Lithium ion batteries -- Deterioration, Electrolytes -- Conductivity
Journal or Publication Title:	ACS Applied Materials & Interfaces
Publisher:	American Chemical Society
ISSN:	1944-8244
Official Date:	21 September 2022
Dates:	Date Event 21 September 2022 Published 12 September 2022 Available 21 August 2022 Accepted 23 June 2022 Submitted
Volume:	14
Number:	37
Page Range:	pp. 42078-42092
DOI:	10.1021/acsami.2c11175
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	10 October 2022
Date of first compliant Open Access:	11 October 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID UNSPECIFIED University of Warwick http://dx.doi.org/10.13039/501100000741 UNSPECIFIED Faraday Technology http://dx.doi.org/10.13039/100006587 UNSPECIFIED High Value Manufacturing Catapult https://hvm.catapult.org.uk/

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