Lithium Dendrite Suppression with a Silica Nanoparticle-Dispersed Colloidal Electrolyte

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Developing a safe and long-lasting lithium (Li) metal battery I is crucial for high-energy applications. However, its poor cycling stability due to Li dendrite formation and excessive Li pulverization is the major hurdle for its practical applications. Here, we present a silica (SiO2) nanoparticle-dispersed colloidal electrolyte (NDCE) and its design principle for suppressing Li dendrite formation. SiO2 nanoclusters in the NDCE play roles in enhancing the Li+ transference number and increasing the Li+ diffusivity in the vicinity of the Li-plating substrate. The NDCE enables less-dendritic Li plating by manipulating the nucleation-growth mode and extending Sand's time. Moreover, SiO2 can interplay with the electrolyte components at the Li-metal surface, enriching fluorinated compounds in the solid electrolyte interface layer. The initial control of the Li plating morphology and SEI structure by the NDCE leads to a more uniform and denser Li deposition upon subsequent cycling, resulting in threefold enhancement of the cycle life. The efficacy of the NDCEs has been further demonstrated by the practical battery design, featuring a commercial-level cathode and thin Li-metal (40 mu m) anode.
Publisher
AMER CHEMICAL SOC
Issue Date
2020-08
Language
English
Article Type
Article
Citation

ACS APPLIED MATERIALS & INTERFACES, v.12, no.33, pp.37188 - 37196

ISSN
1944-8244
DOI
10.1021/acsami.0c09871
URI
http://hdl.handle.net/10203/276386
Appears in Collection
CBE-Journal Papers(저널논문)
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