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p2-Na_(2/3)Ni_(2/3)Te_(1/3)O_(2)Cathode for Na-ion Batteries with High Voltage and Excellent Stability

Energy & Environmental Materials 2023年第2期6卷 54-61页

作者： Wenhui Wang Jiaolong Zhang Chaolin Li Xiaohang Kou Baohua Li Denis Y.W.Yu School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhen 518055China School of Energy and Environment City University of Hong KongHong Kong China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China Shenzhen Key Laboratory on power Battery Safety Research and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolShenzhen 518055China

Air-stable layered structured cathodes with high voltage and good cycling stability are highly desired for the practical application of Na-ion ***,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 *** 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 *** 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.

关键词： air stability cathode Na_(2)Ni_(2)TeO_(6) Na-ion battery oxygen redox reaction p2 structure

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