The electrochemical properties of traditional graphite anodes cannot meet the current market requirements, which restrict the commercial applications of lithium-ion batteries (LIBs). Herein, we report a facile one-step dealloying strategy to fabricate dual-network nanoporous NiFe₂O₄/NiO composites. The composite presents excellent electrochemical performance, delivering a high reversible capacity of 1618 mAh g^-1 at 200 mA g^-1 for 100 cycles followed at 500 mA g^-1 for 250 cycles. Even at 1000 mA g^-1, a specific capacity of 416 mAh g^-1 can be retained after 2000 cycles. The good electrochemical performance ascribes to the synergistic effect of two kinds of active materials (NiFe₂O₄ and NiO) and the unique dual-network porous structure, in which the plenty of pores can accommodate the volume change during the charge/discharge cycling while a mass of mesopores on the skeletons shorten the diffusion distances of ions and electrons. The employed strategy opens a door for the novel structural design of dealloyed anode materials, which may facilitate the further development of the dealloying technique for various application fields.

传统石墨阳极的电化学性能无法满足当前的市场需求，这限制了锂离子电池（LIB）的商业应用。本文中，我们报告了一种简便的一步脱合金策略，以制备双网络纳米多孔NiFe ₂ O ₄ / NiO复合材料。该复合材料具有出色的电化学性能，在200 mA g ^-1的100个循环中提供1618 mAh g ^-1的高可逆容量，在250 mA循环中提供500 mA g ^-1的高可逆容量。即使在1000 mA g ^-1时，比容量也为416 mAh g ^-1可以在2000个周期后保留。良好的电化学性能归因于两种活性材料（NiFe ₂ O ₄和NiO）的协同作用以及独特的双网状多孔结构，其中大量的孔可以适应充电/放电循环期间的体积变化骨架上大量的中孔缩短了离子和电子的扩散距离。所采用的策略为脱合金阳极材料的新颖结构设计打开了一扇门，这可能有助于针对各种应用领域的脱合金技术的进一步发展。