A biopolymer-based functional separator for stable Li metal batteries with an additive-free commercial electrolyte

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Lithium (Li) metal is an ideal anode material for next-generation batteries. However, the commercialization of Li metal-based batteries is impeded by uncontrollable Li dendrite formation and the accumulation of a solid-electrolyte interphase (SEI). Recently, various polymers have been investigated to form a stable SEI layer on Li metal and extend its cycle life. In this study, a polymer film composed of sodium alginate (Na-Alg), which is a natural biopolymer obtained from brown algae, and poly(ethylene oxide) (PEO), was used as a separator. Na-Alg sustained the film structure and PEO facilitated Li-ion diffusion by absorbing the liquid electrolyte. Without using any additives in the commercial carbonate electrolyte, this method extended the cycle life of a Li metal symmetric cell to 1000 h with an overpotential <10 mV, and the cycle life of a full-cell (LiNi0.6Co0.2Mn0.2O2 cathode) to 200 cycles. This study suggests that the use of a biopolymer may enable the practical use of Li metal in next-generation batteries.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2021-03
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.12, pp.7774 - 7781

ISSN
2050-7488
DOI
10.1039/d0ta12153c
URI
http://hdl.handle.net/10203/282806
Appears in Collection
MS-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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