材料科学
阳极
集电器
枝晶(数学)
铜
多孔性
电流密度
电化学
化学工程
锂(药物)
电镀(地质)
金属
剥离(纤维)
成核
冶金
复合材料
电极
电解质
物理化学
内分泌学
有机化学
化学
工程类
地质学
物理
数学
地球物理学
医学
量子力学
几何学
作者
Heng Zhao,Danni Lei,Yan‐Bing He,Yifei Yuan,Qinbai Yun,Bin Ni,Wei Lv,Baohua Li,Quan‐Hong Yang,Feiyu Kang,Jun Lü
标识
DOI:10.1002/aenm.201800266
摘要
Abstract The development of lithium (Li) metal anodes Li metal batteries faces huge challenges such as uncontrolled Li dendrite growth and large volume change during Li plating/stripping, resulting in severe capacity decay and high safety hazards. A 3D porous copper (Cu) current collector as a host for Li deposition can effectively settle these problems. However, constructing a uniform and compact 3D porous Cu structure is still an enormous challenge. Herein, an electrochemical etching method for Cu–Zinc (Zn) alloy is reported to precisely engrave a 3D Cu structure with uniform, smooth, and compact porous network. Such a continuous structure endows 3D Cu excellent mechanical properties and high electrical conductivity. The uniform and smooth pores with a large internal surface area ensures well dispersed current density for homogeneous Li metal deposition and accommodation. A smooth and stable solid electrolyte interphase is formed and meanwhile Li dendrites and dead Li are effectively suppressed. The Li metal anode conceived 3D Cu current collector can stably cycle for 400 h under an Li plating/stripping capacity of 1 mA h cm −2 and a current density of 1 mA cm −2 . The Li@3D Cu||LiFePO 4 full cells present excellent cycling and rate performances. The electrochemical dealloying is a robust method to construct 3D Cu current collectors for dendrite‐free Li metal anodes.
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