Surface optimized P2-Na2/3Ni1/3Mn2/3O2 cathode material via conductive Al-doped ZnO for boosting sodium storage. (1st July 2022)

• Record Type: Journal Article
• Authors: Xu, Kang; Yan, Mengmeng; Chang, Yu-Xin; Xing, Xuanxuan; Yu, Lianzheng; Xu, Sailong
• Is Part Of: Electrochimica acta. Volume 419(2022)
• Publication Date: 2022-07-01
• Subjects: Layered transition-metal oxides -- Cathode materials -- Surface coating -- Al-doped ZnO -- Sodium-ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.140394
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Layered transition-metal oxides have been potential as high-performance cathode materials for sodium-ion batteries (SIBs), however, suffer from the undesirable side reactions between cathode/electrolyte interface during cycling. One improvement strategy by surface coatings is typically used, but at the compromise of lowering ion transport kinetics and poor rate capability. Herein, we report a surface optimized high-rate P2-Na2/3 Ni1/3 Mn2/3 O2 cathode material for SIBs via a highly conductive Al-doped ZnO (AZO). By tuning the calcination temperatures, the optimized cathode material coated with 1 wt% AZO at 500 °C exhibits decent cycling and rate performances (66.2 mAh g −1 with a capacity retention of 82.6% at 5C after 500 cycles). Electrochemical kinetics analysis demonstrates that the NM@AZO-500 exhibits a high Na + diffusion coefficient and a low charge-transfer resistance, and in-situ X-ray diffraction (XRD) and ex-situ X-ray photoelectron spectroscopy (XPS) reveal that the AZO coating effectively relieves the lattice stress during cycles and inhibits undesirable side reaction; all of which give rise to the observed enhancement. The result promises an effective surface optimized route for high-performance cathode materials for SIBs by coating highly conductive oxide. Graphical abstract: Image, graphical abstract