Revealing the atomistic origin of the disorder-enhanced Na-storage performance in NaFePO4 battery cathode
Revealing the atomistic origin of the disorder-enhanced Na-storage performance in NaFePO4 battery cathode
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揭示NaFePO4电池正极无序增强储钠性能的原子起源
DOI：
10.1016/j.nanoen.2018.12.087
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发表时间：
2019-03
期刊：
影响因子：
17.6
通讯作者：
Yue Yuanzheng
中科院分区：
文献类型：
--
作者：
Xiong Fangyu;An Qinyou;Xia Lixue;Zhao Yan;Mai Liqiang;Tao Haizheng;Yue Yuanzheng
在各种类型的钠离子电池正极材料中，NaFePO4以其理论容量高(155mA h g−1)、低成本、高结构稳定性和无毒等优点而备受关注。然而，具有大理石结构、热力学稳定相的NaFePO4一直被认为对钠离子的存储没有电化学活性。在这项工作中，我们成功地通过机械力化学方法调节了NaFePO4正极材料的无序度，以提高Na离子电池的电化学性能。合成的NaFePO4正极材料中同时含有无定形晶相和大理石相，具有较好的钠存储性能，在1 C下的初始容量为115 mA h g−1,800次循环后容量保持率为91.3%，循环稳定性良好。通过X射线近边吸收和拉曼光谱分析，揭示了非晶态NaFePO4电极储钠性能提高的原子级结构根源。共边FeO_6八面体在非晶化过程中转变为各种FeO_6多面体是钠离子电池获得优异性能的关键。
Among the various types of cathode materials for sodium ion batteries, NaFePO4attracts much attention owing to its high theoretical capacity (155 mA h g−1), low cost, high structural stability, and non-toxicity. Nevertheless, the NaFePO4with maricite structure, thermodynamically stable phase, has been considered as electrochemically inactive for sodium-ion storage. In this work, we succeeded in tuning the degree of disorder in NaFePO4cathode material by a mechanochemical route to enhance electrochemical performances of Na-ion batteries. The derived NaFePO4cathodes containing both amorphous and maricite phases exhibit much improved sodium storage performance with an initial capacity of 115 mA h g−1at 1 C and an excellent cycling stability of capacity retention of 91.3% after 800 cycles. By X-ray absorption near edge and Raman spectroscopy, we revealed the atom-scale structural origin of the enhanced Na-storage performances of the amorphous NaFePO4electrode. The transformation of edge-sharing FeO6octahedra into various FeOnpolyhedra upon amorphization was found to be a key to attain the superior performances for Na ion batteries.
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