Micro/Nano Na3V2(PO4)3/N-Doped Carbon Composites with a Hierarchical Porous Structure for High-Rate Pouch-Type Sodium-Ion Full-Cell Performance

Lina Zhao; Hailei Zhao; Jie Wang; Yang Zhang; Zhaolin Li; Zhihong Du; Konrad Świerczek; Yanglong Hou

doi:10.1021/acsami.0c21861

Micro/Nano Na₃V₂(PO₄)₃/N-Doped Carbon Composites with a Hierarchical Porous Structure for High-Rate Pouch-Type Sodium-Ion Full-Cell Performance

ACS Appl Mater Interfaces. 2021 Feb 24;13(7):8445-8454. doi: 10.1021/acsami.0c21861. Epub 2021 Feb 9.

Authors

Lina Zhao^{1

2

3}, Hailei Zhao^{1

2}, Jie Wang^{1

2}, Yang Zhang^{1

2}, Zhaolin Li^{1

2}, Zhihong Du^{1

2}, Konrad Świerczek⁴, Yanglong Hou³

Affiliations

¹ School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.
² Beijing Municipal Key Laboratory of New Energy Materials and Technologies, Beijing 100083, China.
³ Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
⁴ Department of Hydrogen Energy, Faculty of Energy and Fuels, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland.

PMID: 33560822
DOI: 10.1021/acsami.0c21861

Abstract

Polyanion-type Na₃V₂(PO₄)₃ (NVP) is an overwhelmingly attractive cathode material for sodium-ion batteries (SIBs) because of its high structural stability and fast Na⁺ mobility. However, its practical application is strongly plagued by either nanoscale particle size or poor rate performance. Herein, a micro/nanocomposite NVP cathode with a hierarchical porous structure is proposed to solve the problem. The microscale NVP material assembled by interconnected nanoflakes with N-doped carbon coating that is capable of simultaneously providing fast carrier transmission dynamics and outstanding structural integrity exhibits precedent sodium-storage behavior. It delivers a superior rate capability (79.1 mAh g^-1 at 200C) and excellent long-life cycling (capacity retention of 73.4% after 10 000 cycles at 100C). Remarkably, a pouch-type sodium-ion full cell consisting of the as-obtained NVP cathode and a hard carbon anode demonstrates the gravimetric energy density as high as 212 Wh kg^-1 and an exceptional rate performance (71.8 mAh g^-1 at 10C). Such structural design of fabricating micro/nanocomposite electrode materials is expected to accelerate the practical applications of SIBs for large-scale energy storage.

Keywords: Na3V2(PO4)3; micro/nanocomposite; porous structure; pouch cell; sodium-ion batteries.