"Win-Win"Scenario of High Energy Density and Long Cycling Life in a Novel Na3.9MnCr0.9Zr0.1(PO4)3 Cathode

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外文摘要：The development of high-energy and long-lifespan NASICON-type cathode materials for sodium-ion batteries has always been a research hotspot but a daunting challenge.Although Na4MnCr(PO4)3 has emerged as one of the most promising high-energy-density cathode materials owing to its three-electron reactions,it still suffers from serious structural distortion upon repetitive charge/discharge processes caused by the Jahn-Teller active Mn3+.Herein,the selective substitution of Cr by Zr in Na4MnCr(PO4)3 was explored to enhance the structural stability,due to the pinning effect of Zr ions and the ≈2.9-electron reactions,as-prepared Na3.9MnCr0.9Zr0.1(PO4)3/C delivers a high capacity retention of 85.94％over 500 cycles at 5 C and an ultrahigh capacity of 156.4 mAh g-1 at 0.1 C,enabling the stable energy output as high as 555.2 Wh kg-1.Moreover,during the whole charge/discharge process,a small volume change of only 6.7％was verified by in situ X-ray diffraction,and the reversible reactions of Cr3+/Cr4+,Mn3+/Mn4+,and Mn2+/Mn3+redox couples were identified via ex situ X-ray photoelectron spectroscopy analyses.Galvanostatic intermittent titration technique tests and density functional theory calculations further demonstrated the fast reaction kinetics of the Na3.9MnCr0.9Zr0.1(PO4)3/C electrode.This work offers new opportunities for designing high-energy and high-stability NASICON cathodes by ion doping.

外文关键词：

high energy densitymechanism investigationNASICON-type cathodessodium-ion batteriesstructure modification

作者：

Yao Wang、Yukun Liu、Pingge He、Junteng Jin、Xudong Zhao、Qiuyu Shen、Jie Li、Xuanhui Qu、Yongchang Liu、Lifang Jiao

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作者单位：

Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 10083,China

Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University,Tianjin 300071,China

Department of Chemistry and Biochemistry,University of California,1156 High Street,Santa Cruz,CA 95064,USA

Tianjin Key Laboratory for Photoelectric Materials and Devices,School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China

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出版年：

2024

DOI：

10.1002/eem2.12519

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)