High lithium storage performance of Ni0.5Fe0.5O1−xNx thin film with NiO-type crystal structure
Zhiyuan MA , Qingbing WANG , Yuhua WANG , Zhaolong LI , Hong ZHANG , Zhicheng LI
Front. Mater. Sci. ›› 2022, Vol. 16 ›› Issue (4) : 220624
The large voltage hysteresis of the NiO anode, which owes much to the intermediate product Li2NiO2, is one of the main obstacles to its practical application in lithium-ion batteries. In this work, we show that the incorporation of Fe- and N-ions in the NiO lattice can suppress the formation of intermediate product Li2NiO2 and thus greatly reduces the voltage hysteresis of the NiO anode from ~1.2 to ~0.9 V. In comparison with the pure NiO electrode, the Ni0.5Fe0.5O1−xNx anode exhibits significantly enhanced reversible specific capacity (959 mAh·g−1 at 0.3 A·g−1), cycling stability (capacity retention of 96.1% at 100th cycle relative to the second cycle) and rate capability (442 at 10 A·g−1). These results provide a practical method to enhance the lithium storage performance of the NiO anode and more importantly a new solution to the large voltage hysteresis of conversion-type anodes.
nickel oxide / thin film / doping / magnetron sputtering / conversion-type anode / voltage hysteresis
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Higher Education Press
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