Aerosol-deposited freestanding Na3V2(PO4)3 thin-film microbattery. (July 2022)

• Record Type: Journal Article
• Authors: Sam Oh, Jin An; Sun, Qiaomei; Tian, Chengxiang; Song, Xu; Chua, Bengwah; Zeng, Kaiyang; Lu, Li
• Is Part Of: Materials today energy. Volume 27(2022)
• Publication Date: 2022-07
• Subjects: Thin-film battery -- Aerosol deposition method -- High energy density -- Microbattery -- Sodium-ion battery; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2022.101006
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: High energy density on chip microbatteries that can provide necessary power capability is highly sought to power miniaturized and smart electronics. Currently, various thin-film electrode fabrication methods are struggling to upscale the production. Herein, a thin all-electrochemical-active sodium-ion electrode consisting of Na3 V2 (PO4 )3 and carbon is prepared using aerosol deposition method without postthermal treatment. The freestanding Na3 V2 (PO4 )3 thin film exhibits an increase in charge transfer efficiency, higher sodium ions diffusion coefficient, and a smaller overpotential than conventional bulk electrode. Consequently, the thin-film half-cell delivers a high reversible areal capacity of 32.2 μAh/cm 2, a high energy density of 0.106 mWh/cm 2, at 96.4 μA/cm 2, and an excellent cyclic stability (88.6% after 1000 cycles at 100 μA/cm 2 ). In addition, the full cell delivers a high initial energy density of 213.6 Wh/kg at 15.8 W/kg. This work presents a viable process to prepare a high-performance electrode thin film for practical application. Graphical abstract: Image 1 Highlights: Composite Na3 V2 (PO4 )3 /C thin electrode film fabricated using aerosol deposition method. High charge transfer efficiency and smaller overpotential in the microbattery. An areal specific capacity of 32.2 μAh/cm 2 at 96.4 μA/cm 2 and 88.6% capacity retention after 1, 000 cycles. Sodium-ion microbattery shows a high initial discharge energy density of 213.6 Wh/kg at 15.8 W/kg.