Extended cycle life in lithium-ion batteries through lithium supplementation from Li [sub] 2C [sub] 4O [sub] 4@SiO [sub] 2 microcapsules

Bhupender Pal (Author), Luka Jurečič (Author), Matej Gabrijelčič (Author), Robert Dominko (Author)

Abstract

The formation of a solid electrolyte interphase (SEI) in lithium-ion batteries consumes active lithium ions, resulting in loss of capacity and decreased cycle life. Most prelithiation methods only address the initial lithium depletion by compensating with a source of lithium ions, overlooking the ongoing lithium consumption through continuous degradation processes. In this study, Li$_2$C$_4$O$_4$@SiO$_2$ microcapsules are presented, in which Li$_2$C$_4$O$_4$ serves as an additional source of lithium ions and the porous SiO$_2$ shell prevents unwanted catalytic reactions, ensuring sustained lithium availability throughout the cycling. The microcapsules are synthesized using a wet impregnation method and characterized using various techniques to confirm their structural, morphological, and compositional properties. Ex situ nuclear magnetic resonance (NMR) analysis demonstrated lithium-ion mobility, and electrochemical tests in full-cell configurations with graphite and graphite/silicon anodes confirmed improved capacity retention and cycle life. This work highlights the potential of microencapsulated lithium-ion sources to improve battery performance in various lithium-ion systems and opens a pathway for battery cells with self-healing functionality that can be triggered on demand.

Keywords

litij-ionski akumulator;mikrokapsule;ex-situ jedrska magnetna resonanca;lithium-ion battery;microcapsules;ex-situ NMR;

Data

Language:	English
Year of publishing:	2025
Typology:	1.01 - Original Scientific Article
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
UDC:	621.352
COBISS:	247147011
ISSN:	2566-6223
Views:	35
Downloads:	46
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	litij-ionski akumulator;mikrokapsule;ex-situ jedrska magnetna resonanca;
Type (COBISS):	Article
Pages:	str. 1-9
Volume:	ǂVol. ǂ
Issue:	ǂiss. ǂ, [article no.] 202500444
Chronology:	2025
DOI:	10.1002/batt.202500444
ID:	27270823