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

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.
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Issue Date
2017-07
Language
English
Keywords

NEGATIVE ELECTRODES; PERFORMANCE; GRAPHITE; DESIGN

Citation

SCIENCE, v.357, no.6348

ISSN
0036-8075
DOI
10.1126/science.aal4373
URI
http://hdl.handle.net/10203/225221
Appears in Collection
EEW-Journal Papers(저널논문)
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