正交晶系
阴极
钾
材料科学
离子
钾离子电池
化学工程
无机化学
化学
冶金
磷酸钒锂电池
阳极
结晶学
晶体结构
工程类
物理化学
有机化学
电极
作者
Rui-Jie Luo,Chong‐Yu Du,Cui Ma,Jie Zeng,Xuan Xu,Zhe Qian,Zhe Mei,Zi-Ting Zhou,Ze-Yu Zhu,Yong‐Ning Zhou
标识
DOI:10.1016/j.cej.2024.151968
摘要
Potassium-ion battery has been considered as a promising energy storage device with low cost and high sustainability. However, its low-temperature performance is always poor due to the large size of K+ ions and poor ion transportation capability under low temperature. In this work, a carbon-coated orthorhombic K3V3(PO4)4/C cathode material for potassium-ion batteries is developed with promising low-temperature cycle performance. At −10 °C, K3V3(PO4)4/C retains a reversible capacity of 52.2 mAh/g for 1400 cycles at a current density of 100 mA g−1. The superior low-temperature performance is attributed to its open framework structure, which provides three-dimension channels for K-ion transportation. It is revealed that V3+/V4+ redox dominates the charge compensation in K3V3(PO4)4/C during charge and discharge processes. Carbon coating can not only reduce the charge transfer resistance of the electrode and prevent electrode cracking, but also helps to the formation of CF3-rich interfaces between the cathode and electrolyte, ensuring high interfacial stability of K3V3(PO4)4/C during cycling.
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