首页|Manipulation of Na3V2(PO4)2F3 via aluminum doping to alter local electron states toward an advanced cathode for sodium-ion batteries

Manipulation of Na3V2(PO4)2F3 via aluminum doping to alter local electron states toward an advanced cathode for sodium-ion batteries

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With its unique 3D skeleton structure and exceptional cyclic stability,the Na+superionic conductor(NASICON)-type Na3V2(PO4)2F3(NVPF)has been con-sidered as a competitive cathode material for advanced Na-ion batteries.However,the release of fluorine during the heat treatment leads to the formation of an additional phase Na3V2(PO4)3(NVP),which results in a low-voltage plateau and compromises the energy density.Herein,we modulate the local electronic states of the V site by aluminum sub-stitution to strengthen the stability of F.The results confirm that the aluminum introduction not only changes the local electron states of V sites,significantly reducing the for-mation of NVP by-product from 6.71 wt％to 1.01 wt％,but also effectively reduces the band gap,improving the electronic conductivity of NVPF.The optimized Na3V1.9A10.1(PO4)2F3 exhibits higher energy density of 340 Wh-kg-1 and excellent rate performance of 106.7 mAh·g-1 at 10C compared with the pristine cathode.

Sodium-ion energy storage batteriesCathodeNASICONDopingElectrochemistry

Shi-Min Wang、Jin-Qi Li、Li Xu、Meng-Jiao Sun、Wen-Jin Huang、Qing Liu、Fu-Tong Ren、Yong-Jiang Sun、Ling-Yan Duan、Hang Ma、Hong Guo

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International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies,School of Materials and Energy,Yunnan University,Kunming 650091,China

College of Environmental and Chemical Engineering,Metallurgy College,Kunming 650033,China

R&D center,Yunnan Yuntianhua Co.,Ltd.,Kunming 650228,China

International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan Key Laboratory of Carbon Neutrality and Green Low-Carbon Technologies,School of Materials and Energy,Yunnan University,Kunming 650091,China

Southwest United Graduate School,Kunming 650091,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaMajor Science and Technology Projects of Yunnan ProvinceNational Natural Science Foundation of Yunnan ProvinceNational Natural Science Foundation of Yunnan ProvinceScientific Research Fund Project of Yunnan Provincial Department of Education

5206404952372232202302AB080019-3202301AS070040202301AU0702092023J0033

2024

10.1007/s12598-024-02777-8

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(9)
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