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

作者：Xing Shen, Quan Zhou, Miao Han, Xingguo Qi, Bo Li, Qiangqiang Zhang, Junmei Zhao, Chao Yang, Huizhou Liu, Yong-Sheng Hu · 发表于：Nature Communications · 年份：2021 · DOI：10.1038/s41467-021-23132-w · 被引用次数：228 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Transition Metal Oxide Nanomaterials

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 Na 3 (VOPO 4 ) 2 F 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.