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Lithiophilic 3D Porous CuZn Current Collector for Stable Lithium Metal Batteries
journal contribution
posted on 2019-12-13, 15:45 authored by Duo Zhang, Alvin Dai, Min Wu, Kang Shen, Teng Xiao, Guangya Hou, Jun Lu, Yiping TangLithium (Li) dendrites formed from nonuniform Li deposition
limit
potential uses of Li metal as an anode material. Here, we report a
lithiophilic 3D porous CuZn current collector that mitigates dendrite
formation and realizes the high stability of Li anodes. As opposed
to the common metal current collector of copper (Cu), calculations
and in situ experiments demonstrate that copper zinc (CuZn) alloys
found in commercially available brass are lithiophilic and promote
uniform Li deposition. Facile dealloying methods are applied to provide
sufficient Li deposition and volume expansion space in brass sheets.
Residual CuZn alloys in the framework are found to induce uniform
Li deposition and stabilize Li dendrite growth. The optimal current
collector (2h-3D CuZn) runs smoothly over 220 cycles at 0.5 mA cm–2 with improved Coulombic efficiencies at high current
density. This demonstrates an economic and facile CuZn preparation
method that unlocks the full potential of Li anodes and provides new
Li battery stabilization approaches.