阴极
材料科学
化学工程
电化学
氧化物
离子
介电谱
相变
容量损失
储能
透射电子显微镜
电极
分析化学(期刊)
纳米技术
化学
热力学
冶金
功率(物理)
物理
有机化学
物理化学
工程类
色谱法
作者
Yuzhen Dang,Zhe Xu,Haidi Yang,Kanghui Tian,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu,Dan Wang
标识
DOI:10.1016/j.apsusc.2023.157856
摘要
Layered transitional metal oxides are promising cathode materials for sodium-ion batteries that benefit from their high energy densities. Nevertheless, the complicated irreversible phase transitions and poor air stability limit their energy efficiency and implementation in practical devices. Here, a new Co-free high-entropy oxide (HEO) layered cathode NaFe0.2Cu0.1Ni0.2Mn0.3Ti0.2O2 is proposed to enhance the reversible phase transition, improve the air stability, and further decrease the cost. The HEO cathode displays excellent sodium-ion storage performance with a capacity of 121 mAh g−1, competitive cycling stability (∼83.8% capacity retention after 200 cycles at 2 C), and enhanced water resistance (capacity of 105.2 mAh g−1 after soaking in water for 2 h and capacity retention of 83% after 200 cycles at 1 C). Moreover, the as-obtained NFCNMT‖hard carbon full cells exhibit superior performance with reversible specific capacity 115 mAh g−1 and approximately ∼73% capacity retention after 100 cycles at 1C. Ex-situ X-ray diffraction and transmission electron microscopy reveal the completely reversible O3 → P3 → O3 structure evolution and suppressed violent changes in lattice parameters owing to the high-entropy design. Furthermore, the galvanostatic intermittent titration technique and in-situ electrochemical impedance spectroscopy reveal that the HEO cathode exhibits fast Na+ diffusion kinetics. For sodium-ion batteries, this work provides a new strategy for suppressing irreversible phase transformation and enhancing air stability.
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