School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Key Laboratory for New Type of Functional Materials in Hebei Province, Hebei University of Technology, Tianjin 300401, China.
Int J Mol Sci. 2023 Feb 19;24(4):4152. doi: 10.3390/ijms24044152.
As high-capacity anode materials, spinel NiFeO aroused extensive attention due to its natural abundance and safe working voltage. For widespread commercialization, some drawbacks, such as rapid capacity fading and poor reversibility due to large volume variation and inferior conductivity, urgently require amelioration. In this work, NiFeO/NiO composites with a dual-network structure were fabricated by a simple dealloying method. Benefiting from the dual-network structure and composed of nanosheet networks and ligament-pore networks, this material provides sufficient space for volume expansion and is able to boost the rapid transfer of electrons and Li ions. As a result, the material exhibits excellent electrochemical performance, retaining 756.9 mAh g at 200 mA g after cycling for 100 cycles and retaining 641.1 mAh g after 1000 cycles at 500 mA g. This work provides a facile way to prepare a novel dual-network structured spinel oxide material, which can promote the development of oxide anodes and also dealloying techniques in broad fields.
作为高容量的阳极材料，尖晶石 NiFeO 因其丰富的储量和安全的工作电压而引起了广泛关注。为了广泛的商业化应用，一些缺点，如由于大的体积变化和较差的导电性而导致的快速容量衰减和较差的可逆性，迫切需要改善。在这项工作中，通过简单的脱合金方法制备了具有双网络结构的 NiFeO/NiO 复合材料。得益于双网络结构，由纳米片网络和韧带-孔隙网络组成，这种材料为体积膨胀提供了充足的空间，并能够促进电子和 Li 离子的快速转移。结果，该材料表现出优异的电化学性能，在 200 mA g 下循环 100 次后仍保持 756.9 mAh g 的容量，在 500 mA g 下循环 1000 次后仍保持 641.1 mAh g 的容量。这项工作提供了一种简便的方法来制备新型的双网络结构尖晶石氧化物材料，这可以促进氧化物阳极和脱合金技术在更广泛领域的发展。
