Issue 9, 2020, Issue in Progress

Enhancement of the electrochemical performance of lithium-ion batteries by SiO2@poly(2-acrylamido-2-methylpropanesulfonic acid) nanosphere addition into a polypropylene membrane

Abstract

Employing electrostatic self-assembly and free radical polymerization, the surface of SiO2 nanospheres was coated with poly(2-acrylamido-2-methylpropanesulfonic acid) (SiO2@PAMPS) bearing strong electron withdrawing sulfonic and amide groups, enhancing the dissociation ability of the lithium salt of the liquid electrolyte and absorbing anions via hydrogen bonds. After SiO2@PAMPS nanospheres were introduced into the polypropylene (PP) membrane (SiO2@PAMPS/PP), the electrolyte affinity and electrolyte uptake of the composite separators were significantly improved. The ionic conductivity of SiO2@PAMPS/PP-18% (where 18% represents the concentration of the solution used for coating) soaked in liquid electrolyte was even 0.728 mS cm−1 at 30 °C, much higher than that of the pristine PP membrane. The LiFePO4/Li half-cell with SiO2@PAMPS/PP-18% had a discharge capacity of 148.10 mA h g−1 and retained 98.67% of the original capacity even after 120 cycles at 0.5C. Even at a rate of 1.0C, the cell capacity could be maintained above 120 mA h g−1. Therefore, a coating formula was developed that could considerably improve the cycling ability and high rate charge–discharge performance of lithium ion batteries.

Graphical abstract: Enhancement of the electrochemical performance of lithium-ion batteries by SiO2@poly(2-acrylamido-2-methylpropanesulfonic acid) nanosphere addition into a polypropylene membrane

Article information

Article type
Paper
Submitted
11 Oct 2019
Accepted
18 Nov 2019
First published
30 Jan 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 5077-5087

Enhancement of the electrochemical performance of lithium-ion batteries by SiO2@poly(2-acrylamido-2-methylpropanesulfonic acid) nanosphere addition into a polypropylene membrane

G. Yang, H. Cai, X. Li, M. Wu, X. Yin, H. Zhang and H. Tang, RSC Adv., 2020, 10, 5077 DOI: 10.1039/C9RA08273E

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