阴极
材料科学
阳极
惰性
氧化还原
磷酸盐
法拉第效率
电化学
化学工程
硅酸钠
硅酸盐
离子键合
钾离子电池
电池(电)
离子
无机化学
磷酸钒锂电池
电极
化学
复合材料
物理化学
冶金
有机化学
工程类
功率(物理)
物理
量子力学
作者
Ruimin Sun,Mingyue Dou,Yuxiang Zhang,Jingyu Chen,Yuhao Chen,Bo Han,Kaisheng Xia,Qiang Gao,Xiaoxiao Liu,Zhao Cai,Chenggang Zhou
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:15 (7): 3345-3350
被引量:15
摘要
Polyanion-type phosphate materials with Na-super-ionic conductor structures are promising for next-generation sodium-ion battery cathodes, although the intrinsically low electroconductivity and limited energy density have restricted their practical applications. In this study, we put forward substituting an inert phosphate with a redox-active silicate to improve the energy density and intrinsic electroconductivity of polyanion-type phosphate materials, thus enabling an advance in sodium-ion battery cathodes. As a proof of concept, some of the phosphate of Na3V2(PO4)3 was replaced by silicate to fabricate Na3V2(PO4)2.9(SiO4)0.1, which exhibited a higher average discharge voltage of 3.36 V and a higher capacity of 115.8 mA h g-1 than pristine Na3V2(PO4)3 (3.31 V, 109.6 mA h g-1) at 0.5 C, therefore improving the energy density. Moreover, the introduced silicate enhanced the intrinsic electroconductivity of Na3V2(PO4)3 materials, as confirmed by both theoretical simulation and electrochemical measurements. After pairing with a commercial hard carbon anode, the optimized Na3V2(PO4)2.9(SiO4)0.1 cathode enabled a stable-cycling full cell with 90.1% capacity retention after 300 cycles at 5 C and a remarkable average coulombic efficiency of 99.88%.
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