Rapid mechanochemical synthesis of polyanionic cathode with improved electrochemical performance for Na-ion batteries

Xing Shen, Quan Zhou, Miao Han, Xingguo Qi, Bo Li, Qiangqiang Zhang, Junmei Zhao (), Chao Yang, Huizhou Liu and Yong-Sheng Hu ()
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Xing Shen: Chinese Academy of Sciences
Quan Zhou: Chinese Academy of Sciences
Miao Han: Chinese Academy of Sciences
Xingguo Qi: Chinese Academy of Sciences
Bo Li: Chinese Academy of Sciences
Qiangqiang Zhang: Chinese Academy of Sciences
Junmei Zhao: Chinese Academy of Sciences
Chao Yang: Chinese Academy of Sciences
Huizhou Liu: Chinese Academy of Sciences
Yong-Sheng Hu: Chinese Academy of Sciences

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Na-ion batteries have been considered promising candidates for stationary energy storage. However, their wide application is hindered by issues such as high cost and insufficient electrochemical performance, particularly for cathode materials. Here, we report a solvent-free mechanochemical protocol for the in-situ fabrication of sodium vanadium fluorophosphates. Benefiting from the nano-crystallization features and extra Na-storage sites achieved in the synthesis process, the as-prepared carbon-coated Na3(VOPO4)2F nanocomposite exhibits capacity of 142 mAh g−1 at 0.1C, higher than its theoretical capacity (130 mAh g−1). Moreover, a scaled synthesis with 2 kg of product was conducted and 26650-prototype cells were demonstrated to proof the electrochemical performance. We expect our findings to mark an important step in the industrial application of sodium vanadium fluorophosphates for Na-ion batteries.

Date: 2021
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DOI: 10.1038/s41467-021-23132-w

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