Protective coating for stable cycling of Li-metal batteries based on cellulose and single-ion conducting polymer

Mariana Vargas Ordaz (Author), Nejc Pavlin (Author), Matteo Gastaldi (Author), Claudio Gerbaldi (Author), Robert Dominko (Author)

Abstract

The thermodynamically unstable interface between metallic lithium and electrolyte poses a major problem for the massive commercialization of Li-metal batteries. In this study, we propose the use of a multicomponent protective coating based on cellulose modified with dimethylthexylsilyl group (TDMSC), single-ion conducting polymer P(LiMTFSI), and LiNO$_3$ (TDMSC-P(LiMTFSI)-LiNO$_3$, namely PTL). The coating shows its positive effect by increasing the Coulombic efficiency in Li || Cu cells from 95.9 and 98.6% for bare Li, to >99.3% for Li coated (Li@PTL), with 1 M LiFSI in FEC:DEC and 1 M LiFSI in DME electrolyte, respectively. Symmetrical Li || Li PTL-coated cells exhibit a much more prolonged and stable cycling with a slower increase in overpotential compared to bare Li cells. Li@PTL anodes enable improved cycling of Li@PTL/LFP cells compared to noncoated cells in liquid electrolytes. In this respect, inhibition of high surface area lithium growth is confirmed through postcycling scanning electron microscopy. Remarkably, dendrite-free galvanostatic cycling is demonstrated in laboratory-scale solid-state battery cells assembled with LFP composite cathode (catholyte configuration with PEO + LiTFSI as ionically conducting binder) and a cross-linked PEO-based solid polymer electrolyte. The PTL protective coating enables improved stability of Li metal batteries in combination with smooth transport of Li$^+$ at the electrode−electrolyte interface and homogeneous lithium coating, highlighting its promising prospects in enhancing the performance and safety of lithium metal batteries by properly tuning the synergy between the coating components.

Keywords

elektrokemija;litij-ionske baterije;celuloza;prevodniki;

Data

Language:	English
Year of publishing:	2024
Typology:	1.01 - Original Scientific Article
Organization:	KI - National Institute of Chemistry
Publisher:	American Chemical Society
UDC:	544.5/.6
COBISS:	219780611
ISSN:	1944-8252
Views:	34
Downloads:	24
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	elektrokemija;litij-ionske baterije;celuloza;prevodniki;
Type (COBISS):	Article
Source comment:	Nasl. z nasl. zaslona; Opis vira z dne 19. 12. 2024;
Pages:	str. 68237–68246
Volume:	ǂVol. ǂ16
Issue:	ǂiss. ǂ49
Chronology:	Dec. 11, 2024
DOI:	10.1021/acsami.4c13335
ID:	25535550