Hollow NiO/carbon pompons for efficient lithium ion storage,Journal of Materials Chemistry A

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Hollow NiO/carbon pompons for efficient lithium ion storage
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-12 , DOI: 10.1039/d2ta05746h
Ming-Jun Xiao ₁ , Bo Ma ₁ , Hong Zhang ₂ , Xiang-Yang Li ₁ , Qiang Wang ₁ , Yong Peng ₂ , Hao-Li Zhang _{1,

3}

Affiliation

NiO with desirable hollow structures is an attractive anode material for lithium ion batteries (LIBs) owing to their high theoretical capacity and large active surface. However, research on hollow NiO composites is often hindered by their complex synthesis and poorly controlled morphology. Herein, we report the fabrication of a novel hierarchical hollow pompon-like NiO carbon composite utilizing an ionic liquid as a structure directing agent and starting material, which provides a low cost and efficient strategy to obtain hollow NiO composites with a tunable particle morphology. The morphology evolution and phase transition of the hollow structure were monitored by in situ TEM, while the atomic structure of the product was studied by probe aberration corrected STEM. Density functional theory (DFT) simulations reveal that the presence of nitrogen doped carbon can optimize the band structure and density of states of NiO for efficient lithium ion adsorption and diffusion. When applied in LIBs, the hollow pompon-like NiO carbon composite exhibits an intriguing specific capacity of 1014 mA h g⁻¹ after 100 cycles at 0.5C. This study opens up a new way to fabricate novel hollow pompon-like NiO composites for lithium ion storage.

中文翻译：

用于高效锂离子存储的空心 NiO/碳绒球

具有理想中空结构的 NiO 因其高理论容量和大活性表面而成为锂离子电池 (LIB) 的有吸引力的负极材料。然而，空心NiO复合材料的研究往往受到其合成复杂和形貌控制不佳的阻碍。在此，我们报道了一种利用离子液体作为结构导向剂和起始材料的新型分级中空绒球状 NiO 碳复合材料的制备，这为获得具有可调颗粒形态的中空 NiO 复合材料提供了一种低成本和有效的策略。通过原位监测空心结构的形态演变和相变TEM，而产品的原子结构是通过探针像差校正的STEM研究的。密度泛函理论 (DFT) 模拟表明，氮掺杂碳的存在可以优化 NiO 的能带结构和态密度，以实现有效的锂离子吸附和扩散。当应用于 LIBs 时，中空绒球状 NiO 碳复合材料在 0.5C 下 100 次循环后表现出 1014 mA hg ^{-1的有趣比容量。}这项研究开辟了一种新的方法来制造用于锂离子存储的新型空心绒球状 NiO 复合材料。

更新日期：2022-09-12

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