Journal
SCIENCE
Volume 357, Issue 6348, Pages 279-283Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal4373
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MEST) [NRF-2015R1A2A1A05001737]
- National Research Foundation of Korea [10Z20130011056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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