Zhen Hou1, Yao Gao1, Hong Tan1, Biao Zhang2,3,4. 1. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China. 2. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China. biao.ap.zhang@polyu.edu.hk. 3. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, China. biao.ap.zhang@polyu.edu.hk. 4. Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hong Kong, China. biao.ap.zhang@polyu.edu.hk.
Abstract
Stable plating/stripping of metal electrodes under high power and high capacity remains a great challenge. Tailoring the deposition behavior on the substrate could partly resolve dendrites' formation, but it usually works only under low current densities and limited capacities. Here we turn to regulate the separator's interfacial chemistry through tin coating with decent conductivity and excellent zincophilicity. The former homogenizes the electric field distribution for smooth zinc metal on the substrate, while the latter enables the concurrent zinc deposition on the separator with a face-to-face growth. Consequently, dendrite-free zinc morphologies and superior cycling stability are achieved at simultaneous high current densities and large cycling capacities (1000 h at 5 mA/cm2 for 5 mAh/cm2 and 500 h at 10 mA/cm2 for 10 mAh/cm2). Furthermore, the concept could be readily extended to sodium metal anodes, demonstrating the interfacial chemistry regulation of separator is a promising route to circumvent the metal anode challenges.
Stable plating/stripn>ping of n>an class="Chemical">metal electrodes under high power and high capacity remains a great challenge. Tailoring the deposition behavior on the substrate could partly resolve dendrites' formation, but it usually works only under low current densities and limited capacities. Here we turn to regulate the separator's interfacial chemistry through tin coating with decent conductivity and excellent zincophilicity. The former homogenizes the electric field distribution for smooth zinc metal on the substrate, while the latter enables the concurrent zinc deposition on the separator with a face-to-face growth. Consequently, dendrite-free zinc morphologies and superior cycling stability are achieved at simultaneous high current densities and large cycling capacities (1000 h at 5 mA/cm2 for 5 mAh/cm2 and 500 h at 10 mA/cm2 for 10 mAh/cm2). Furthermore, the concept could be readily extended to sodium metal anodes, demonstrating the interfacial chemistry regulation of separator is a promising route to circumvent the metal anode challenges.
Authors: Fei Wang; Oleg Borodin; Tao Gao; Xiulin Fan; Wei Sun; Fudong Han; Antonio Faraone; Joseph A Dura; Kang Xu; Chunsheng Wang Journal: Nat Mater Date: 2018-04-16 Impact factor: 43.841