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| Amorphous niobium pyrophosphate (NbP1.8O7) as high rate anode of Na-ion batteries |
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LI Zhongtao1, LÜ Qing1, LIU Tao2, XING Tao2, LIU Haiyan2
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(1.State Key Laboratory of Heavy Oil Processing(School of Chemistry and Chemical Engineering in China University of Petroleum(East China)), Qingdao 266580, China;2.National Engineering Research Center of Coal Gasification and Coal-Based Advanced Materials, Shandong Energy Group Company Limited, Jinan 250100, China)
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| Abstract: |
| A simple method for the synthesis of niobium pyrophosphate NbP1.8O7 using polymer was proposed. A polymer-assisted one-step calcination was used to prepare pure-phase niobium pyrophosphate by regulating the addition amount of phosphorus-containing polymer. The calcination heating rate was adjusted to further improve the amorphization of the anode material. Then the electrochemical performance of the electrode material was investigated. The results show that the optimized electrode materials present excellent electrochemical sodium storage performance. Niobium pyrophosphate tends to be more amorphous at temperature rise rate of 5 ℃/min and exhibits better electrochemical performance. It has a reversible discharge capacity of 164.6 and 101.37 mA·h/g after 5000 cycles at a current density of 1000 mA/g and 2000 mA/g. |
| Key words: Na-ion batteries anode materials polyanionic compounds niobium pyrophosphate |
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