Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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Synthesis and Electrochemical Properties of Na2Fe0.8Mg0.15Ni0.05PO4F/C Composite as Cathode Materials for Sodium-ion Batteries
Feixiang GUOSen WANG Gaobin LIUTao WANGWencai HUXueyan HANYongheng FANQi YUAN
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2022 年 90 巻 11 号 p. 117003

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Due to the abundance and low cost of sodium, sodium-ion batteries have received renewed attention in large-scale applications. At present, the primary task is to explore a new generation of cathode materials with excellent performance. Herein, ascorbic acid was used as a carbon source, Na2Fe0.85Mg0.15PO4F/C (NFMPF/C) and Na2Fe0.8Mg0.15Ni0.05PO4F/C (NFMNPF/C) cathode materials were prepared by conventional solid-state reaction method on the basis of Na2FePO4F/C (NFPF/C). The electrochemical performance of the cathode material was improved by doping Mg and Ni on the Fe site, which was confirmed by the volt-ampere characteristic test and charge-discharge test. Compared with NFPF/C, the electrochemical performance of NFMPF/C has been greatly improved. After further doping of Ni, NFMNPF/C shows a stable discharge capacity, which can still maintain 91.3 % of the initial specific capacity after 50 cycles at 0.1 C-rate, while the rate capability shows a great improvement. The optimized NFMNPF/C sample can deliver a specific discharge capacity of 53 mAh/g at 5 C-rate. In general, the simple doping of NFPF/C optimizes the cycle life and rate capability at the same time. As a low-cost cathode material, this study provides more possibilities for the development of sodium-ion batteries.

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© The Author(s) 2022. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License (CC BY-NC-SA, http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium by share-alike, provided the original work is properly cited. For permission for commercial reuse, please email to the corresponding author. [DOI: 10.5796/electrochemistry.22-00103].
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