材料科学
煅烧
空位缺陷
尖晶石
阳极
电化学
锂(药物)
过渡金属
氧化物
扩散
氧气
化学工程
电极
纳米技术
物理化学
催化作用
化学
热力学
冶金
结晶学
有机化学
内分泌学
工程类
物理
医学
生物化学
作者
Wenqing Du,Yongqian Zheng,Xueyi Liu,Jie Cheng,R. Chenna Krishna Reddy,Akif Zeb,Xiaoming Lin,Yifan Luo
标识
DOI:10.1016/j.cej.2022.138626
摘要
Transition metal oxide anode materials have recently been losing their importance as advanced functional and smart materials due to early capacity decay and sluggish kinetics. In order to address this issue, vacancy engineering approach can be adapted, which can effectively manipulate the electronic structure of transition metal oxide (TMO)-based electrode materials. Herein, a series of MOF-derived oxygen-rich vacancy MFe2O4/C (M = Ni, Mn, Co) materials are synthesized on a large scale via solvothermal and subsequent calcination treatment for energy storage applications in lithium-ion batteries. All the synthesized OV-NFO (NiFe2O4), OV-MFO (MnFe2O4) and OV-CFO (CoFe2O4) electrodes achieve excellent electrochemical performance, superior multiplier performance and incredible lithium-ion diffusion rate, which was found to be superior than their counterpart electrodes. The oxygen vacancy (OV) enrichment contribution to higher conductivity was realized by experimental and density functional theory (DFT) calculations results, where it has been established that OV provides additional active sites, accelerates Li+ diffusion and improves pseudocapacitive contribution. This vacancy-engineering strategy for modulating electronic structure and reaction kinetics enabled new ideas for the design and execution of other advanced transition metal-based electrode materials.
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