A conductive self healing polymeric binder using hydrogen bonding for Si anodes in lithium ion batteries

A ureido-pyrimidinone (UPy)-functionalized poly(acrylic acid) grafted with poly(ethylene glycol)(PEG), designated PAU-g-PEG, was developed as a high performance polymer binder for Si anodes in lithium-ion batteries. By introducing both a ureido-pyrimidinone (UPy) unit, which is capable of self-heali...

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Vydané v:Scientific reports Ročník 10; číslo 1; s. 14966
Hlavní autori: Nam, Jaebin, Kim, Eunsoo, K.K., Rajeev, Kim, Yeonho, Kim, Tae-Hyun
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: London Nature Publishing Group UK 11.09.2020
Nature Publishing Group
Predmet:
639/4077/4079/891
639/638/455/958
639/638/675
Anodes
Coniferous forests
Dispersal
Electrochemistry
Electrodes
Fossil pollen
Humanities and Social Sciences
Lithium
multidisciplinary
Polymers
Science
Science (multidisciplinary)
Vegetation
Vegetation patterns
Tibet
China
ISSN:2045-2322, 2045-2322
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Shrnutí:A ureido-pyrimidinone (UPy)-functionalized poly(acrylic acid) grafted with poly(ethylene glycol)(PEG), designated PAU-g-PEG, was developed as a high performance polymer binder for Si anodes in lithium-ion batteries. By introducing both a ureido-pyrimidinone (UPy) unit, which is capable of self-healing through dynamic hydrogen bonding within molecules as well as with Si, and an ion-conducting PEG onto the side chain of the poly(acrylic acid), this water-based self-healable and conductive polymer binder can effectively accommodate the volume changes of Si, while maintaining electronic integrity, in an electrode during repeated charge/discharge cycles. The Si@PAU- g -PEG electrode retained a high capacity of 1,450.2 mAh g −1 and a Coulombic efficiency of 99.4% even after 350 cycles under a C-rate of 0.5 C. Under a high C-rate of 3 C, an outstanding capacity of 2,500 mAh g −1 was also achieved, thus demonstrating its potential for improving the electrochemical performance of Si anodes.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-71625-3