인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
The Li<sup>+</sup>-transport mechanisms in both solid polymer electrolytes (SPEs) and liquid electrolytes (LEs) are fundamentally governed by solvation dynamics, requiring an optimal balance between continuous coordination and moderate binding strength. Poly(ethylene oxide) (PEO) is a classic SPE matrix that leverages its -CH<sub>2</sub>-CH<sub>2</sub>-O- (EO) segments to provide continuous oxygen coordination for Li<sup>+</sup> transport via amorphous regions. While continuous EO segments facilitate the intra-chain Li<sup>+</sup>-transport, their strong multidentate solvation of Li<sup>+</sup> through a chelate effect - each Li<sup>+</sup> chelates with 4-6 ethylene oxide (EO) units - significantly hinders the inter-chain Li<sup>+</sup> mobility. This effect creates rigid solvation cages that both immobilize Li<sup>+</sup> and resist modification by alternative moieties (e.g. carbonate or nitrile groups), resulting in poor room-temperature ionic conductivity (σ) and low Li<sup>+</sup> transference number (t<sub>Li+</sub>). To address these challenges, we developed a series of precise Li<sup>+</sup>-transport models (LTMs) through click chemistry, strategically combining acrylate-PEG and acrylonitrile to engineer balanced interactions between multidentate (EO) and monodentate (C = O, C ≡ N) coordination sites. This design achieved synergistic enhancement of both inter- and intra-chain transport pathways, demonstrated by significantly improved performance with σ = 6.40 × 10<sup>- 5</sup> S/cm and t<sub>Li+</sub> = 0.44 at 25 °C. This approach permits tailored control of dynamic solvation structures, offering new opportunities to enhance Li<sup>+</sup> transport in PEO-based solid polymer electrolytes.
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