Multiscale Interfacial Strategy to Engineer Mixed Metal-Oxide Anodes toward Enhanced Cycling Efficiency

ACS Applied Materials & Interfaces
Yue MaBingqing Wei

Abstract

Interconnected macro/mesoporous structures of mixed metal oxide (MMO) are developed on nickel foam as freestanding anodes for Li-ion batteries. The sustainable production is realized via a wet chemical etching process with bio-friendly chemicals. By means of divalent iron doping during an in situ recrystallization process, the as-developed MMO anodes exhibit enhanced levels of cycling efficiency. Furthermore, this atomic-scale modification coherently synergizes with the encapsulation layer across a micrometer scale. During this step, we develop a quasi-gel-state tri-copolymer, i.e., F127-resorcinol-melamine, as the N-doped carbon source to regulate the interfacial chemistry of the MMO electrodes. Electrochemical tests of the modified Fe xNi1- xO@NC-NiF anode in both half-cell and full-cell configurations unravel the favorable suppression of the irreversible capacity loss and satisfactory cyclability at the high rates. This study highlights a proof-of-concept modification strategy across multiple scales to govern the interfacial chemical process of the electrodes toward better reversibility.

References

Nov 20, 2001·Nature·J M Tarascon, M Armand
Mar 14, 2008·Angewandte Chemie·Peter G BruceJean-Marie Tarascon
Jun 16, 2015·ChemSusChem·Julian KalhoffStefano Passerini
Jul 3, 2015·Chemical Society Reviews·Jian QiDan Wang
Dec 21, 2016·Nature Materials·Steven ChuNian Liu

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