| 长循环高电压钠离子电池正极材料P2-Na2/3Mn1/3Bi1/3Ni1/3O2的合成及性能 |
| Synthesis and properties of P2-Na2/3Mn1/3Bi1/3Ni1/3O2 as long-life and high voltage sodium-ion battery cathode |
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| 摘要: 镍基层状氧化物NaNiO2钠离子电池材料具有高电压和高容量的特性,且制备方法较为简单,但姜-泰勒(Jahn-Teller)效应使其在高倍率循环下容量较低以及在高电压(4.5 V)下无法稳定循环。通过调节溶胶-凝胶工艺的条件,设计、合成了Na2/3Mn1/3Bi1/3Ni1/3O2片层状金属氧化物,并将其作为正极活性材料,在空气环境中组装成钠离子电池,进行电化学测试,考察Bi、Mn掺入量对电池电化学影响。研究结果表明:当金属Mn和Bi共掺时,在1.2~4.5 V宽电压范围内,电池在循环50周后容量为90.39 mAh·g-1。在2.0~4.0 V电压范围内1.0C (115 mA·g-1)倍率下恒流充放电50周后的容量保持率为96.96%,循环850周后的保持率为80.15%,具有良好的循环稳定性和安全性。 |
| 关键词: 钠离子电池 镍基氧化物 锰掺杂 铋掺杂 电化学性能 |
| 基金项目: 内蒙古自治区直属高校基本科研业务费项目资助。 |
| Abstract: Layered nickel-based cathode materials are of great interest due to their high voltage and specific capacities for sodium ion batteries. However, the Jahn-Teller effect is detrimental for achieving considerable cycling stability at high voltage (4.5 V) and rate capability. Herein, a P2-type Na2/3Mn1/3Bi1/3Ni1/3O2 cathode material was synthesized by adjusting the process conditions of sol-gel, and used as positive active materials to assemble sodium ion battery in air environment. The improved cycling and rate performance under high voltage can be achieved by Mnsubstitution and Bi-substitution. In a wide voltage range of 1.2 to 4.5 V, the material maintained a specific discharge capacity of 90.39 mAh·g-1 after 50 cycles. The cathode obtained a remarkable capacity retention of 96.96% after 50 cycles at 1C (115 mA·g-1) and 80.15% capacity retention up to 850 cycles from 2.0 to 4.0 V. The above data indicate that the cathode materials own an extremely long cycling life and better rate capability. |
| Keywords: sodium-ion battery nickel-based oxide manganese doping bismuth doping electrochemical performance |
| 投稿时间：2023-01-11 修订日期：2023-04-18 |
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| 马腾跃,安金玲,张鹏,刘进荣,何伟艳.长循环高电压钠离子电池正极材料P2-Na2/3Mn1/3Bi1/3Ni1/3O2的合成及性能[J].无机化学学报,2023,39(6):1023-1030. |
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