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Journal of Inorganic Materials

Journal of Inorganic Materials >

2025 , Vol. 40 >Issue 5: 497 - 503

DOI: https://doi.org/10.15541/jim20240490

RESEARCH ARTICLE

Structural Evolution and Electrochemical Performance of Na4FexP4O12+x/C Cathode Materials for Sodium-ion Batteries

  • WAN Junchi ,
  • DU Lulu ,
  • ZHANG Yongshang ,
  • LI Lin ,
  • LIU Jiande ,
  • ZHANG Linsen
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  • School of New Energy, Zhengzhou University of Light Industry, Zhengzhou 450001, China
WAN Junchi (1995-), male, Master candidate. E-mail: 875801788@qq.com
DU Lulu, lecturer. E-mail: 2024007@zzuli.edu.cn;
ZHANG Linsen, professor. E-mail: hnzhanglinsen@163.com

Received date: 2024-11-20

  Revised date: 2025-01-13

  Online published: 2025-02-13

Supported by

Key Program of Henan Province for Science and Technology(241111240300);Doctoral Science Research Foundation of Zhengzhou University of Light Industry(2024BSJJ021);Henan Outstanding Foreign Scientists Studio(GZS2024016);Zhongyuan Scholar Workstation Funded Project(234400510015);Zhengzhou Science and Technology for People Project(2023KJHM0028)

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Abstract

The development of low-cost and long-lifespan sodium-ion battery (SIB) cathode materials is crucial for large-scale energy storage. Iron-based phosphate cathode materials have attracted significant attention in recent years for their high theoretical capacity, excellent structural stability and rich resources. Here, a series of Na4FexP4O12+x/C (x=2.6-3.3) electrode materials are prepared using Sol-Gel technique and thermal treatment process. Effect of the phase structure on electrochemical performance of Na4FexP4O12+x/C electrode materials is investigated. It is found that three phases, including Na2FeP2O7 (NFPO), Na4Fe3(PO4)2P2O7 (NFPP) and NaFePO4 (NFP), mainly exist in the Na4FexP4O12+x/C system. Among Na4FexP4O12+x/C electrode materials, Na4Fe3.1P4O15.1/C electrode material with the highest content of NFPP phase possesses rapid electronic and sodium-ion conduction characteristics, thereby exhibiting the optimal electrochemical performance. As a result, the SIB equipped with Na4Fe3.1P4O15.1/C electrode material shows high reversible capacity, with a discharge specific capacity of 102.8 mAh·g-1 at a current density of 0.1C (1C=129 mAh·g-1), as well as capacity retention of 88.7% after 700 cycles. Furthermore, the as-assembled battery exhibits excellent rate performance with a discharge specific capacity of 61.5 mAh·g-1 at a current density of 5C.

Key words： sodium-ion battery; iron-based phosphate; phase transition; electrochemical performance

Cite this article

WAN Junchi , DU Lulu , ZHANG Yongshang , LI Lin , LIU Jiande , ZHANG Linsen . Structural Evolution and Electrochemical Performance of Na4FexP4O12+x/C Cathode Materials for Sodium-ion Batteries[J]. Journal of Inorganic Materials, 2025 , 40(5) : 497 -503 . DOI: 10.15541/jim20240490

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