化学
正交晶系
电化学
磷酸铁
磷酸盐
阴极
离子
相(物质)
能量密度
无机化学
电极
化学工程
结晶学
有机化学
物理化学
工程物理
晶体结构
工程类
作者
Chunliu Xu,Lin Zhou,Teng Gao,Chen-Liang Zhao,Xianhua Hou,Jiao Zhang,Ying Bai,Liangrong Yang,Huizhou Liu,Chao Yang,Junmei Zhao,Yong‐Sheng Hu
摘要
Iron-based phosphate cathode of Na4Fe3(PO4)2(P2O7) has been regarded as a low-cost and structurally stable cathode material for Na-ion batteries (NIBs). However, their practical application is greatly hindered by the insufficient electrochemical performance and limited energy density. Here, we report a new iron-based phosphate cathode of Na4.5Fe3.5(PO4)2.5(P2O7) with the intergrown heterostructure of the maricite-type NaFePO4 and orthorhombic Na4Fe3(PO4)2(P2O7) phases at a mole ratio of 0.5:1. Benefited from the increased composition ratio and the spontaneous activation of the maricite-type NaFePO4 phase, the as-prepared Na4.5Fe3.5(PO4)2.5(P2O7) composites deliver a reversible capacity over 130 mA h g-1 and energy density close to 400 W h kg-1, which is far beyond that of the single-phase Na4Fe3(PO4)2(P2O7) cathode (∼120 mA h g-1 and ∼350 W h kg-1). Moreover, the kg-level products from the scale-up synthesis demonstrate a stable cycling performance over 2000 times at 3 C in pouch cells. We believe that our findings could show the way forward the practical application of the iron-based phosphate cathodes for NIBs.
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