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Issue 20, 2020
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Saponin-containing multifunctional binder toward superior long-term cycling stability in Li–S batteries

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Abstract

Saponin, comprising hydrophilic glycoside moieties with a hydrophobic aglycone structure, is introduced for the first time as a multi-functional additive for high-performance sulfur cathodes. The hydroxyl groups efficiently suppress the lithium polysulfide shuttle effect and prepare sites that can strengthen the mechanical properties of the cathode through crosslinking with a polymer binder. The amphiphilic structure of saponin also helps to disperse active electrode materials in the sulfur cathode. Through the synergistic effects from its unique structure, the addition of a small amount (1 wt%) of saponin into the sulfur cathode boosts a 300% increase in the specific capacity of the cathode with a capacity decay of 0.012% per cycle at 2C over 1000 cycles.

Graphical abstract: Saponin-containing multifunctional binder toward superior long-term cycling stability in Li–S batteries

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Supplementary files

Article information


Submitted
17 Mar 2020
Accepted
01 May 2020
First published
01 May 2020

J. Mater. Chem. A, 2020,8, 10419-10425
Article type
Paper

Saponin-containing multifunctional binder toward superior long-term cycling stability in Li–S batteries

S. Kim, M. Cho and Y. Lee, J. Mater. Chem. A, 2020, 8, 10419
DOI: 10.1039/D0TA03051A

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