A novel sheet perovskite type oxides LaFeO_(3)anode for nickel-metal hydride batteries  

作　　者：Shuo Jin Kailiang Ren Jin Liang Jie Kong 

机构地区：[1]Shaanxi Key Laboratory of Macromolecular Science and Technology,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Journal of Materials Science & Technology》2024年第28期218-226,共9页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22205182);the China Postdoctoral Science Foundation(No.2022M722594);the Fundamental Research Funds for the Central Universities(No.5000220174);supported by the Innovation Team of Shanxi Sanqin Scholars.

摘　　要：Compared with traditional hydrogen storage alloys,perovskite oxide LaFeO_(3)materials are considered as one of the most promising anode materials for nickel-metal hydride batteries owing to their low cost,environmental friendliness,and superior temperature resistance.However,the biggest problem faced by perovskite oxide LaFeO_(3)as an anode material for Nickel/metal hydride(Ni-MH)batteries is the low electrical conductivity and poor specific capacity,which is mainly due to the serious agglomeration phenomenon in its structure.To solve the above problems,lamellar LaFeO_(3)material with large specific surface area and small particle size has been synthesized by adding N,N-Dimethylformamide(DMF)and polyvinyl pyrrolidone(PVP)inhibitor materials to the precursor.By changing the sintering temperature,the lamellar composite LaFeO_(3)material can be controlled.Consequently,the maximum discharge capacity of lamellar LaFeO_(3)is up to 372.1 mA h g^(-1)at the discharge current density of 60 mA g^(-1).Meanwhile,after 100 cycles,the specific discharge capacity of the lamellar LaFeO_(3)can still reach 293.1 mA h g^(-1),which is much higher than that of 98.5 mA h g^(-1)for LaFeO_(3).In addition,the kinetics of LaFeO_(3)has been investigated and the lamellar LaFeO_(3)shows excellent dynamic properties.Notably,the exchange current density I0(300 mA g^(-1))of the layered LaFeO_(3)electrode is higher than that of LaFeO_(3)(150 mA g^(-1)).Overall,this work provides insights into a structure-performance relationship for the further development of high-performance perovskite-type oxide nickel-metal hydride battery anodes.

关 键 词：Perovskite-type oxide Lamellar LaFeO_(3) Nickel metal hydride batteries Electrochemical performance 

分 类 号：TG1[金属学及工艺—金属学]