Taking advantage of the large surface area and high porosity characteristic of metal-organic framework (MOF) materials, the synthesis of carbon-coated bimetallic transition metal oxides stands out as an effective strategy to reduce volume expansion, enhance cycling stability, and improve electronic conductivity at the active sites in lithium-ion batteries (LIBs). In this research, a novel rambutan-like Ni-Co MOF was successfully synthesized via a hydrothermal method followed by calcination to obtain nitrogen-doped carbon-stabilized hierarchical rambutan-like NiCoO composites (NiCoO/NC). The resulting composites inherited the original rambutan-like structure of the Ni-Co MOF, which was characterized by uniform size, highly ordered porosity and large surface area, and showed excellent electrochemical Li storage performance. In particular, the NiCoO/NC-600 composite exhibited superior cyclic stability and rate capability, maintaining a remarkable reversible charge/discharge specific capacity of 1281.7/1292.7 mAh g after 400 cycles at 0.5 A g. In addition, when paired with LiFePO in a full cell, it maintained a reversible discharge specific capacity of 143.9 mAh g after 200 cycles at 0.1 A g, indicating commendable cyclic stability. analyses confirmed the pseudo-capacitive behavior of the NiCoO/NC composites. Furthermore, the nitrogen-doped carbon layer embedded in the NiCoO/NC composites effectively mitigated the volume expansion during repeated Li stripping/plating processes, thereby improving the structural integrity, conductivity, and specific capacitance. This study presents a practical approach for fabricating nitrogen-doped carbon-stabilized bimetallic oxide anodes in high-power LIBs through architectural engineering and compositional tailoring.

中文翻译：

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Ni-Co MOF衍生的红毛丹类NiCo2O4/NC复合负极材料用于高性能锂存储

利用金属有机骨架（MOF）材料的大表面积和高孔隙率特性，合成碳包覆双金属过渡金属氧化物是减少体积膨胀、增强循环稳定性和提高电子电导率的有效策略在锂离子电池（LIB）的活性位点。本研究通过水热法成功合成了一种新型的类红毛丹Ni-Co MOF，并通过煅烧获得了氮掺杂碳稳定的多级红毛丹类NiCoO复合材料（NiCoO/NC）。所得复合材料继承了Ni-Co MOF原有的红毛丹状结构，具有尺寸均匀、孔隙率高度有序和比表面积大的特点，并表现出优异的电化学储锂性能。特别是，NiCoO/NC-600复合材料表现出优异的循环稳定性和倍率性能，在0.5 A g-1下循环400次后仍保持着1281.7/1292.7 mAh g-1的显着可逆充电/放电比容量。此外，当与LiFePO组合成全电池时，在0.1 A g-1下循环200次后，其可逆放电比容量仍保持在143.9 mAh g-1，表现出值得称赞的循环稳定性。分析证实了 NiCoO/NC 复合材料的赝电容行为。此外，嵌入NiCoO/NC复合材料中的氮掺杂碳层有效地减轻了重复脱锂/镀锂过程中的体积膨胀，从而提高了结构完整性、电导率和比电容。这项研究提出了一种通过建筑工程和成分定制在高功率锂离子电池中制造氮掺杂碳稳定双金属氧化物阳极的实用方法。