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Download fileUnveiling the Relationship between the Surface Chemistry of Nanoparticles and Ion Transport Properties of the Resulting Composite Electrolytes
journal contribution
posted on 2021-01-02, 13:46 authored by Pin Ma, Yanyan Fang, Xiaowen Zhou, Yumeng Shi, Hui Ying Yang, Yuan LinFundamental
understanding of the transport properties within nanoparticle
composite electrolytes is necessary for the development of next-generation
electrochemical devices. Herein, the effect of surface-modified silica
nanoparticles with aminophenyl, amide, and sulfonate functional groups
(AP-SiO2, AM-SiO2, and SU-SiO2) on
the ion transport properties of composite electrolytes is systematically
investigated. The competition between surface repulsive and attractive
interactions of nanoparticles is reflected in the nature of the morphology
and particle network in electrolytes, further affecting the ionic
conductivity of electrolytes and diffusion coefficient of ions. The
obvious decrease is observed in the AP-SiO2-based system
because of the severe agglomeration of nanoparticles. By contrast,
the AM-SiO2 and SU-SiO2 form the regular particle
network structure and accelerate the salt dissociation in electrolytes,
thereby providing an effective ion transport pathway and more mobile
ions for conduction, respectively. Consequently, the composite systems
with AM-SiO2 and SU-SiO2 deliver remarkable
enhancement in the ion transport properties.