摘要
镍基层状氧化物NaNiO_(2)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Na_(2/3)Mn_(1/3)Bi_(1/3)Ni_(1/3)O_(2)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。
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 Na_(2/3)Mn_(1/3)Bi_(1/3)Ni_(1/3)O_(2)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.
作者
马腾跃
安金玲
张鹏
刘进荣
何伟艳
MA Teng‑Yue;AN Jin‑Ling;ZHANG Peng;LIU Jin‑Rong;HE Wei‑Yan(School of Chemical Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2023年第6期1023-1030,共8页
Chinese Journal of Inorganic Chemistry
基金
内蒙古自治区直属高校基本科研业务费项目资助。
关键词
钠离子电池
镍基氧化物
锰掺杂
铋掺杂
电化学性能
sodium-ion battery
nickel-based oxide
manganese doping
bismuth doping
electrochemical performance