Xia Yuanyuan, Hu Wang, Yao Yiyuan, Chen Shuhui, Ahn Seongki, Hang Tao, Wu Yunwen, Li Ming
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China.
Department of New Energy and Mining Engineering, Sangji University, 26339, Republic of Korea.
Nanotechnology. 2022 Mar 25;33(24). doi: 10.1088/1361-6528/ac5b53.
Since uncontrolled lithium (Li) dendrite growth and dendrite-induced dead Li severely limit the development of Li metal batteries, 3D Cu current collectors can effectively alleviate these problems during Li plating/stripping. Herein, one-step galvanostatic electrodeposition method is employed to fabricate a new current collector on Cu foam decorated with large-scale and uniform 3D porous Cu-based nanoflake (NF) structures (abbreviated as 3D Cu NF@Cu foam). This 3D structure with large internal surface areas not only generates lithophilic surface copper oxides and hydroxides as charge centers and nucleation sites for Li insertion/extraction, but also endows abundant space with interlinked NFs for buffering the cell volume expansion and increasing battery performance. As a result, Li-deposited 3D Cu NF@Cu foam current collector can realize stable cycling over 455 cycles with an average Coulombic efficiency of 98.8% at a current density of 1.0 mA cm, as well as a prolonged lifespan of >380 cycles in symmetrical cell without short-circuit, which are superior to those of blank Cu foam current collector. This work realizes Li metal anode stabilization by constructing 3D porous Cu NFs current collectors, which can advance the development of Li metal anode for battery industries.
由于锂（Li）枝晶的无控制生长以及枝晶诱导的死锂严重限制了锂金属电池的发展，3D铜集流体可以在锂电镀/剥离过程中有效缓解这些问题。在此，采用一步恒电流电沉积法在装饰有大规模且均匀的3D多孔铜基纳米片（NF）结构的泡沫铜上制备一种新型集流体（简称为3D Cu NF@泡沫铜）。这种具有大内部表面积的3D结构不仅会生成亲锂表面铜氧化物和氢氧化物作为锂嵌入/脱出的电荷中心和成核位点，还赋予相互连接的纳米片丰富的空间来缓冲电池体积膨胀并提高电池性能。结果，锂沉积的3D Cu NF@泡沫铜集流体在1.0 mA cm的电流密度下能够实现455次循环的稳定循环，平均库仑效率为98.8%，并且在对称电池中具有超过380次循环的延长寿命且无短路，这些均优于空白泡沫铜集流体。这项工作通过构建3D多孔铜纳米片集流体实现了锂金属负极的稳定化，这可以推动电池行业锂金属负极的发展。
