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Oxide-Based Composite Electrolytes Using NaZrSiPO/NaPS Interfacial Ion Transfer. | LitMetric

Oxide-Based Composite Electrolytes Using NaZrSiPO/NaPS Interfacial Ion Transfer.

ACS Appl Mater Interfaces

Department of Applied Chemistry, Graduate School of Engineering , Osaka Prefecture University, 1-1 Gakuencho , Naka-ku, Sakai , Osaka 599-8531 , Japan.

Published: June 2018

AI Article Synopsis

Article Abstract

All-solid-state sodium batteries using NaZrSiPO (NASICON) solid electrolytes are promising candidates for safe and low-cost advanced rechargeable battery systems. Although NASICON electrolytes have intrinsically high sodium-ion conductivities, their high sintering temperatures interfere with the immediate development of high-performance batteries. In this work, sintering-free NASICON-based composites with NaPS (NPS) glass ceramics were prepared to combine the high grain-bulk conductivity of NASICON and the interfacial formation ability of NPS. Before the composite preparation, the NASICON/NPS interfacial resistance was investigated by modeling the interface between the NASICON sintered ceramic and the NPS glass thin film. The interfacial ion-transfer resistance was very small above room temperature; the area-specific resistances at 25 and 100 °C were 15.8 and 0.40 Ω cm, respectively. On the basis of this smooth ion transfer, NASICON-rich (70-90 wt %) NASICON-NPS composite powders were prepared by ball-milling fine powders of each component. The composite powders were well-densified by pressing at room temperature. Scanning electron microscopy observation showed highly dispersed sub-micrometer NASICON grains in a dense NPS matrix to form closed interfaces between the oxide and sulfide solid electrolytes. The composite green (unfired) compacts with 70 and 80 wt % NASICON exhibited high total conductivities at 100 °C of 1.1 × 10 and 6.8 × 10 S cm, respectively. An all-solid-state NaSn/TiS cell was constructed using the 70 wt % NASICON composite electrolyte by the uniaxial pressing of the powder materials, and its discharge properties were evaluated at 100 °C. The cell showed the reversible capacities of about 120 mAh g under the current density of 640 μA cm. The prepared oxide-based composite electrolytes were thus successfully applied in all-solid-state sodium rechargeable batteries without sintering.

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http://dx.doi.org/10.1021/acsami.8b02427DOI Listing

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