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N-doped porous carbon encapsulated MnFe2O4 nanoparticles as advanced anodes for Li-ion batteries
Taolin Zhao,Xinlei Zhang,Zezheng Liu,Qingyuan Gu,Xiaoyu Jin,Saihu Xie,Shuai Liu 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3
Transition metal oxide MnFe 2 O 4 is considered a promising anode material for Li-ion batteries owing to its high theoreticalspecifi c capacity. However, this material has two bottleneck problems, i.e., poor conductivity and serious volume expansionduring cycling. In this work, MnFe 2 O 4 nanoparticles were successfully encapsulated in the matrix of N-doped porouscarbon via a sol–gel method. As a result, the N-doped carbon matrix enhances the electronic conductivity of the composites. The special porous structure increases the contact area between the electrode material and the electrolyte and facilitates therapid infi ltration of the electrolyte. At a calcination temperature of 400 °C, the MnFe 2 O 4 /C composite shows a high initialdischarge specifi c capacity of 1207.0 mAh g −1 at 0.2 A g −1 and retains a reversible specifi c capacity of 1100.1 mAh g −1after 200 cycles. The simple design of metal oxide nanomaterials encapsulated in N-doped porous carbon provides a newdirection for improving the electrochemical performance of electrode materials for Li-ion batteries.
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