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

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 t...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-03, Vol.9 (12), p.7774-7781
Main Authors: Jeong, Jooyoung, Lee, Jia, Kim, Jinuk, Chun, Jinyoung, Kang, DongGyu, Han, Seung Min, Jo, Changshin, Lee, Jinwoo
Format: Article
Language:English
Subjects:
Additives
Algae
Alginic acid
Anodes
Batteries
Biopolymers
Commercialization
Dendritic structure
Electrode materials
Electrolytes
Ethylene oxide
Ion diffusion
Lithium
Lithium ions
Metals
Polyethylene oxide
Polymer films
Polymers
Separators
Sodium
Sodium alginate
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Summary: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 1000 h) under additive-free condition.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta12153c