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A Pyrene-Poly(acrylic acid)-Polyrotaxane Supramolecular Binder Network for High-Performance Silicon Negative Electrodes

Cited 79 time in Web of Science Cited 79 time in Scopus
Authors

Cho, Yunshik; Kim, Jaemin; Elabd, Ahmed; Choi, Sunghun; Park, Kiho; Kwon, Tae-woo; Lee, Jungmin; Char, Kookheon; Coskun, Ali; Choi, Jang Wook

Issue Date
2019-12
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Citation
Advanced Materials, Vol.31 No.51, p. 1905048
Abstract
Although being incorporated in commercial lithium-ion batteries for a while, the weight portion of silicon monoxide (SiOx, x approximate to 1) is only less than 10 wt% due to the insufficient cycle life. Along this line, polymeric binders that can assist in maintaining the mechanical integrity and interfacial stability of SiOx electrodes are desired to realize higher contents of SiOx. Herein, a pyrenepoly(acrylic acid) (PAA)-polyrotaxane (PR) supramolecular network is reported as a polymeric binder for SiOx with 100 wt%. The noncovalent functionalization of a carbon coating layer on the SiOx is achieved by using a hydroxylated pyrene derivative via the pi-pi stacking interaction, which simultaneously enables hydrogen bonding interactions with the PR-PAA network through its hydroxyl moiety. Moreover, the PR's ring sliding while being crosslinked to PAA endows a high elasticity to the entire polymer network, effectively buffering the volume expansion of SiOx and largely mitigating the electrode swelling. Based on these extraordinary physicochemical properties of the pyrene-PAA-PR supramolecular binder, the robust cycling of SiOx electrodes is demonstrated at commercial levels of areal loading in both half-cell and full-cell configurations.
ISSN
0935-9648
URI
https://hdl.handle.net/10371/164682
DOI
https://doi.org/10.1002/adma.201905048
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