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Synthesis and properties of P2-Na2/3Mn1/3Bi1/3Ni1/3O2 as long-life and high voltage sodium-ion battery cathode
Author NameAffiliationE-mail
MA Teng-Yue School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China  
AN Jin-Ling School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China  
ZHANG Peng School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China  
LIU Jin-Rong School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China  
HE Wei-Yan School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China heweiyan@imut.edu.cn 
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
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MA Teng-Yue,AN Jin-Ling,ZHANG Peng,LIU Jin-Rong,HE Wei-Yan.Synthesis and properties of P2-Na2/3Mn1/3Bi1/3Ni1/3O2 as long-life and high voltage sodium-ion battery cathode[J].Chinese Journal of Inorganic Chemistry,2023,39(6):1023-1030.
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Chinese Journal of Inorganic Chemistry