在多孔铜泡沫上生长的三维八面体纳米晶体 Cu2O/CuF2 作为无枝晶锂金属阳极的亲石骨架,ACS Applied Materials & Interfaces

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在多孔铜泡沫上生长的三维八面体纳米晶体 Cu2O/CuF2 作为无枝晶锂金属阳极的亲石骨架
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-08-28 , DOI: 10.1021/acsami.3c08892
Soundarrajan Elumalai ₁ , Prettencia Leonard Joseph ₁ , Roselin Ranjitha Mathiarasu ₂ , Kalaivani Raman ₁ , Raghu Subashchandrabose ₃

Affiliation

金属锂（Li）阳极由于其高理论容量和低电化学势而在下一代储能系统中备受追捧。然而，锂负极的商业化面临挑战，包括枝晶生长不受控制和循环过程中的体积变化。为了解决这些问题，我们开发了一种新型三维 (3D) 铜集流体。在这里，我们提出了一种两步法在 3D Cu 集流体上制造 Cu ₂ O/CuF _{2八面体纳米晶体（ONC）。}由此产生的具有分布式 ONC 的铜泡沫提供了活性电化学位点，促进均匀的锂成核和无枝晶的锂沉积。稳定的Cu ₂ O/CuF ₂ ONCs@CF 金属集流体可作为无枝晶锂金属负极的可靠主体。_{此外，具有预先构建的Cu 2} O/CuF ₂ ONCs@CF导电框架的高孔隙铜泡沫可有效降低局部电流密度，抑制Li剥离和电镀过程中的体积变化。_{使用Cu 2} O/CuF ₂ ONCs@CF金属集流体的对称电池表现出优异的稳定性，在1 mA cm ^–2下保持超过1600小时，并且在相同电流密度下100次循环后库仑效率保持在98%的高度稳定，优于Li。 @CuF金属集流体。_{此外，在与富镍层状氧化物正极材料（Li@Cu 2} O/CuF ₂ ONCs@CF//NMC-811）搭配的全电池配置中，所提出的装置表现出卓越的倍率性能和延长的循环寿命。总之，我们的工作提出了一种解决锂负极挑战的有前景的策略，并强调了 Cu ₂ O/CuF ₂ ONCs@CF 金属集流体的卓越性能，为高容量和持久的锂基储能系统提供了潜力。

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Three-Dimensional Octahedral Nanocrystals of Cu2O/CuF2 Grown on Porous Cu Foam Act as a Lithophilic Skeleton for Dendrite-Free Lithium Metal Anode

Metallic-lithium (Li) anodes are highly sought-after for next-generation energy storage systems due to their high theoretical capacity and low electrochemical potential. However, the commercialization of Li anodes faces challenges, including uncontrolled dendrite growth and volume changes during cycling. To address these issues, we developed a novel three-dimensional (3D) copper current collector. Here, we propose a two-step method to fabricate Cu₂O/CuF₂ octahedral nanocrystals (ONCs) onto 3D Cu current collectors. The resulting Cu foam with distributed ONCs provides active electrochemical sites, promoting uniform Li nucleation and dendrite-free Li deposition. The stable Cu₂O/CuF₂ ONCs@CF metallic current collector serves as a reliable host for dendrite-free lithium metal anodes. Additionally, the highly porous copper foam with a preconstructed conductive framework of Cu₂O/CuF₂ ONCs@CF effectively reduces local current density, suppressing volume changes during Li stripping and plating. The symmetric cell using Cu₂O/CuF₂ ONCs@CF metallic current collector exhibits excellent stability, maintaining over 1600 h at 1 mA cm^–2 and a highly stable Coulombic efficiency of 98% over 100 cycles at the same current density, outperforming Li@CuF metallic current collectors. Furthermore, in a full-cell configuration paired with nickel-rich layered oxide cathode materials (Li@Cu₂O/CuF₂ ONCs@CF//NMC-811), the proposed setup demonstrates exceptional rate performance and an extended cycle life. In conclusion, our work presents a promising strategy to address Li anode challenges and highlights the exceptional performance of the Cu₂O/CuF₂ ONCs@CF metallic current collector, offering potential for high-capacity and long-lasting lithium-based energy storage systems.

更新日期：2023-08-28

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