Chu Kainian, Li Zhiqiang, Xu Shikai, Yao Ge, Xu Yang, Niu Ping, Zheng Fangcai
Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Anhui University, Ministry of Education, Hefei, Anhui 230601, People's Republic of China.
Dalton Trans. 2020 Aug 11;49(31):10808-10815. doi: 10.1039/d0dt00553c.
Although binary metal oxides with high theoretical specific capacities and power densities are widely investigated as promising anode materials for lithium-ion batteries (LIBs), their poor cycling stability and huge volume expansion largely limit their extensive application in practical electrode materials. Herein, we report a facile strategy to synthesize hollow NiCo2O4 nanowires through direct calcination of binary metal-organic frameworks (MOFs) in air. When evaluated as an anode material for LIBs, NiCo2O4 nanowires deliver a reversible capacity of 1310 mA h g-1 at a current density of 100 mA g-1 after 100 cycles. Even at a high current density of 1 A g-1, NiCo2O4 nanowires exhibit long-term cycling stability with a capacity of 720 mA h g-1 after 1000 cycles. The outstanding lithium-storage performance can be attributed to the unique structures with 1D porous channels, which are beneficial for the fast transfer of Li+ ions and electrolyte and alleviate the strain caused by the volume expansion during cycling processes.
尽管具有高理论比容量和功率密度的二元金属氧化物作为锂离子电池（LIBs）的有前景的负极材料被广泛研究，但其较差的循环稳定性和巨大的体积膨胀在很大程度上限制了它们在实际电极材料中的广泛应用。在此，我们报道了一种通过在空气中直接煅烧二元金属有机框架（MOFs）来合成中空NiCo2O4纳米线的简便策略。当作为LIBs的负极材料进行评估时，NiCo2O4纳米线在100 mA g-1的电流密度下经过100次循环后提供1310 mA h g-1的可逆容量。即使在1 A g-1的高电流密度下，NiCo2O4纳米线在1000次循环后仍表现出长期循环稳定性，容量为720 mA h g-1。出色的储锂性能可归因于具有一维多孔通道的独特结构，这有利于Li+离子和电解质的快速传输，并减轻循环过程中体积膨胀引起的应变。
