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Highly elastic binders integrating polyrotaxanes for silicon microparticle anodes in lithium ion batteries

Cited 916 time in Web of Science Cited 956 time in Scopus
Authors

Choi, Sunghun; Kwon, Tae-Woo; Coskun, Ali; Choi, Jang Wook

Issue Date
2017-07
Publisher
American Association for the Advancement of Science
Citation
Science, Vol.357 No.6348, pp.279-283
Abstract
Lithium-ion batteries with ever-increasing energy densities are needed for batteries for advanced devices and all-electric vehicles. Silicon has been highlighted as a promising anode material because of its superior specific capacity. During repeated charge-discharge cycles, silicon undergoes huge volume changes. This limits cycle life via particle pulverization and an unstable electrode-electrolyte interface, especially when the particle sizes are in the micrometer range. We show that the incorporation of 5 weight% polyrotaxane to conventional polyacrylic acid binder imparts extraordinary elasticity to the polymer network originating from the ring sliding motion of polyrotaxane. This binder combination keeps even pulverized silicon particles coalesced without disintegration, enabling stable cycle life for silicon microparticle anodes at commercial-level areal capacities.
ISSN
0036-8075
URI
https://hdl.handle.net/10371/164706
DOI
https://doi.org/10.1126/science.aal4373
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  • College of Engineering
  • School of Chemical and Biological Engineering
Research Area Physics, Materials Science

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