阴极
材料科学
分析化学(期刊)
离子
电压
自行车
相(物质)
体积热力学
电气工程
化学
热力学
物理
物理化学
色谱法
有机化学
考古
工程类
历史
作者
Wenhui Wang,Jiaolong Zhang,Chaolin Li,Xiaohang Kou,Baohua Li,Yaming Yu
出处
期刊:Energy & environmental materials
日期:2022-03-30
卷期号:6 (2)
被引量:2
摘要
Air‐stable layered structured cathodes with high voltage and good cycling stability are highly desired for the practical application of Na‐ion batteries. Herein, we report a P2‐Na 2/3 Ni 2/3 Te 1/3 O 2 cathode that is stable in ambient air with an average operating voltage of ~3.8 V, demonstrating excellent cycling stability with a capacity retention of more than 92.7% after 500 cycles at 20 mA g −1 and good rate capability with 91.9% capacity utilization at 500 mA g −1 with respect to capacity at 5 mA g −1 between 2.0 and 4.0 V. When the upper cutoff voltage is increased to 4.4 V, P2‐Na 2/3 Ni 2/3 Te 1/3 O 2 delivers a reversible capacity of 71.9 mAh g −1 and retains 91.8% of the capacity after 100 cycles at 20 mA g −1 . The charge compensation during charge/discharge is mainly due to the redox couple of Ni 2+ /Ni 3+ in the host with a small amount of contribution from oxygen. The stable structure of the material without phase transformation and with small volume change during charge‐discharge allows it to give excellent cycle performance especially when the upper cutoff voltage is not higher than 4.2 V.
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