Facile Synthesis of Ant-Nest-Like Porous Duplex Copper as Deeply Cycling Host for Lithium Metal Anodes.,Small

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Facile Synthesis of Ant-Nest-Like Porous Duplex Copper as Deeply Cycling Host for Lithium Metal Anodes.
Small ( IF 13.0 ) Pub Date : 2020-08-14 , DOI: 10.1002/smll.202001784
Kui Lin _{1,

2} , Tong Li ₁ , Sum-Wai Chiang ₁ , Ming Liu ₃ , Xianying Qin _{1,

4} , Xiaofu Xu ₁ , Lihan Zhang _{1,

2} , Feiyu Kang _{1,

2} , Guohua Chen ₄ , Baohua Li ₁

Affiliation

Suppressing the dendrite formation and managing the volume change of lithium (Li) metal anode have been global challenges in the lithium batteries community. Herein, a duplex copper (Cu) foil with an ant‐nest‐like network and a dense substrate is reported for an ultrastable Li metal anode. The duplex Cu is fabricated by sulfurization of thick Cu foil with a subsequent skeleton self‐welding procedure. Uniform Li deposition is achieved by the 3D interconnected architecture and lithiophilic surface of self‐welded Cu skeleton. The sufficient space in the porous layer enables a large areal capacity for Li and significantly improves the electrode–electrolyte interface. Simulations reveal that the structure allows proper electric field penetration into the connected tunnels. The assembled Li anodes exhibit high coulombic efficiency (97.3% over 300 cycles) and long lifespan (>880 h) at a current density of 1 mA cm⁻² with a capacity of 1 mAh cm⁻². Stable and deep cycling can be maintained up to 50 times at a high capacity of 10 mAh cm⁻².

中文翻译：

方便地合成类似蚁巢的多孔双相铜作为锂金属阳极的深循环主体。

抑制枝晶的形成并控制锂（Li）金属阳极的体积变化已成为锂电池界的全球性挑战。在此，据报道，一种超稳定的锂金属阳极具有类似蚁巢状网络和致密衬底的双面铜箔。通过硫化厚的铜箔并随后进行骨架自焊接程序来制造双相铜。通过3D互连架构和自焊接Cu骨架的亲硫表面实现均匀的Li沉积。多孔层中的足够空间可实现较大的Li面积容量，并显着改善电极-电解质界面。仿真显示该结构允许适当的电场穿透到连接的隧道中。组装好的锂阳极表现出高的库仑效率（97。^-2以1毫安厘米的容量^-2。在10 mAh cm ^-2的高容量下，稳定和深度的循环最多可维持50次。

更新日期：2020-09-18

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