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Статья

Na‐Rich Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> Cathodes for Long Cycling Rechargeable Sodium Full Cells

Yao LiuDepartment of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. ChinaXiangyong WuDepartment of Materials Science and Engineering University of Washington Seattle WA 98195 USAAbdul MoeezDepartment of Materials Science and Engineering University of Washington Seattle WA 98195 USAZhi PengDepartment of Materials Science and Engineering University of Washington Seattle WA 98195 USAYongyao XiaDepartment of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. ChinaDongyuan ZhaoDepartment of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. ChinaJun LiuDepartment of Materials Science and Engineering University of Washington Seattle WA 98195 USAWei LiDepartment of Chemistry Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 P. R. China
2022en
ABI

Аннотация

Abstract NASICON‐type sodium vanadium phosphate (Na 3 V 2 (PO 4 ) 3 , or NVP) cathode materials have great potential for fast charging and long cycling sodium‐ion batteries (SIBs) similar to lithium iron phosphate (LiFePO 4 , or LFP) cathode materials used in lithium‐ion batteries (LIBs). However, the cycle life and energy density in the full cell using NVP materials need to be significantly improved. This paper investigates the degradation mechanisms of NVP‐based SIBs and identifies the Na loss from the cathode to the anode solid electrolyte interphase (SEI) reactions as the main cause of capacity degradation. A new Na‐rich NVP cathode (e.g., Na 4 V 2 (PO 4 ) 3 , or Na 4 VP) is developed to address the Na loss problem. Conventional NVP can be easily transformed into the Na 4 VP by a facile and fast chemical solution treatment (30 s). Na‐free‐anode Na 4 VP and hard carbon‐Na 4 VP full cells are assembled to evaluate the electrochemical properties of the Na‐rich NVP cathode. The Na 4 VP cathode provides excess Na to compensate for the Na loss, resulting much longer cycle life in the full cells (&gt;400 cycles) and a high specific energy and power density. Good low‐temperature performance is also observed.

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Идентификаторы

DOI
10.1002/aenm.202203283

Цитирования и источники

Цитирований: 3Использованных источников: 0
Показатели — AkademScholar