Issue 10, 2023

Single-crystalline Mg-substituted Na4Mn3(PO4)2P2O7 nanoparticles as a high capacity and superior cycling cathode for sodium-ion batteries

Abstract

Mn-based mixed phosphate Na4Mn3(PO4)2(P2O7) (NMPP) is a promising cathode for high-potential, low-cost and eco-friendly sodium-ion batteries. However, this material still faces some bottleneck issues in terms of low conductivity, disturbance of impure crystalline phase, micron-sized agglomerated particles and the Mn3+ Jahn–Teller effect. Herein, a Mg-substituted NMPP (NM2.7Mg0.3PP)@C composite was constructed via modified solution combustion and subsequent calcination treatment. The obtained NM2.7Mg0.3PP presents a highly pure phase and single-crystalline characteristics. It is noteworthy that the sample shows a smaller particle size of 100–300 nm due to the Mg2+ incorporation, and the prepared NM2.7Mg0.3PP@C cathode exhibits considerable discharge capacity (119 mA h g−1), an improved rate capability and excellent long cycling stability of 1000 cycles. A series of measurements indicated that the Mg-substitution enhanced the electronic conductivity and ion diffusion rate, and effectively relieved the lattice distortion influenced by the multiphase transition from the Mn Jahn–Teller effect of the NM2.7Mg0.3PP@C cathode. In addition, NM2.7Mg0.3PP adopts an optimal 3Mg0.1–Mn1–Mn2–Mn3 crystal structure based on density functional theory (DFT) calculations and refined X-ray diffractometry results. These findings provide new insight into the design of highly stabilized and high-conductivity polyanionic cathodes for sodium-ion batteries.

Graphical abstract: Single-crystalline Mg-substituted Na4Mn3(PO4)2P2O7 nanoparticles as a high capacity and superior cycling cathode for sodium-ion batteries

Supplementary files

Article information

Article type
Communication
Submitted
30 Sep 2022
Accepted
06 Feb 2023
First published
09 Feb 2023

Nanoscale, 2023,15, 4830-4838

Single-crystalline Mg-substituted Na4Mn3(PO4)2P2O7 nanoparticles as a high capacity and superior cycling cathode for sodium-ion batteries

H. Xu, J. Ma, X. He, J. Sun, L. Yang, R. Jiang, Z. Lei, Z. Liu and Q. Li, Nanoscale, 2023, 15, 4830 DOI: 10.1039/D2NR05442F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements