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…

• KI
  Korea Institute of Science and Technology
• NR
  National Research Foundation of Korea

  Awards: NRF-2015R1A2A1A05001737, award304738
• KA
  Korea Advanced Institute of Science and Technology