Journal
ACS APPLIED ENERGY MATERIALS
Volume 2, Issue 4, Pages 2585-2595Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b02212
Keywords
lithium secondary battery; ion conductivity; solid electrolyte membrane; mechanical stability; graft copolymer
Funding
- National Research Foundation of Korea - Korean Government (MEST) [NRF2017R1A2B2008019, 2018M3D1A1058624]
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Poly(arylene ether sulfone)-g-poly(ethylene glycol) graft copolymers (PAES-g-PEG) containing 1-butyl-1-methylpyrrollidum bis(fluoromethane sulfonyl) (PYR14-TFSI) were synthesized to prepare the solid electrolyte membranes for lithium secondary battery. Several essential properties including lithium ion conductivity, lithium ion transference number, thermal, mechanical, and dimensional stability were investigated and correlated to the ion cluster dimension examined by small-angle X-ray scattering. The PAES-g-PEG membranes showed the excellent flexibility with the thermal degradation temperature of over 200 degrees C, the elongation at break of 250%, and the dimensional stability up to 120 degrees C. As the lithium ion conductivity increased with PYR14-TFSI contents, the membrane with 70 wt % PYR14-TFSI exhibited the highest conductivity of 6.1 x 10(-4) S cm(-1) at room temperature without any mechanical failure. LiCoO2/SE/Li and S/SE/Li cell assemblies fabricated from this membrane were capable of delivering 126 and 782 mAh g(-1) at a low C-rate, respectively.
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