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Nano Lett. 2016 Sep 14;16(9):5938-43. doi: 10.1021/acs.nanolett.6b02932. Epub 2016 Aug 10.

Achieving High-Energy-High-Power Density in a Flexible Quasi-Solid-State Sodium Ion Capacitor.

Author information

1
Materials Science and Engineering Program and Department of Mechanical Engineering, The University of Texas at Austin , Austin, Texas 78712, United States.
2
Jiangsu Key Laboratory of Materials and Technologies for Energy Conversion, College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, China.

Abstract

Simultaneous integration of high-energy output with high-power delivery is a major challenge for electrochemical energy storage systems, limiting dual fine attributes on a device. We introduce a quasi-solid-state sodium ion capacitor (NIC) based on a battery type urchin-like Na2Ti3O7 anode and a capacitor type peanut shell derived carbon cathode, using a sodium ion conducting gel polymer as electrolyte, achieving high-energy-high-power characteristics in solid state. Energy densities can reach 111.2 Wh kg(-1) at power density of 800 W kg(-1), and 33.2 Wh kg(-1) at power density of 11200 W kg(-1), which are among the best reported state-of-the-art NICs. The designed device also exhibits long-term cycling stability over 3000 cycles with capacity retention ∼86%. Furthermore, we demonstrate the assembly of a highly flexible quasi-solid-state NIC and it shows no obvious capacity loss under different bending conditions.

KEYWORDS:

Sodium ion capacitor; conducting gel polymer; energy storage; high-energy density; high-power density; solid-state

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