期刊
NANO-MICRO LETTERS
卷 14, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-021-00788-z
关键词
Zinc metal battery; MgF2 layer; Limited zinc doping; Ion-transfer kinetic; Deposition guidance
资金
- National Research Foundation - Ministry of Science and ICT, Republic of Korea [NRF-2019H1D3A1A01069779]
- KIST [2V09284, 2E31863]
- National Research Foundation of Korea [2019H1D3A1A01069779] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study presents a limitedly Zn-doped MgF2 interphase on the surface of Zn metal electrodes to address issues such as hydrogen evolution reaction and dendrite formation. The interphase structure reduces the interfacial resistance and enables fast kinetics and uniform deposition of Zn ions, leading to improved battery performance.
The practical applications of aqueous Zn metal batteries are currently restricted by the inherent drawbacks of Zn such as the hydrogen evolution reaction, sluggish kinetics, and dendrite formation. To address these problems, herein, a limitedly Zn-doped MgF2 interphase comprising an upper region of pure, porous MgF2 and a lower region of gradient Zn-doped MgF2 is achieved via radio frequency sputtering technique. The porous MgF2 region is a polar insulator whose high corrosion resistance facilitates the de-solvation of the solvated Zn ions and suppression of hydrogen evolution, resulting in Zn metal electrodes with a low interfacial resistance. The Zn-doped MgF2 region facilitates fast transfer kinetics and homogeneous deposition of Zn ions owing to the interfacial polarization between the Zn dopant and MgF2 matrix, and the high concentration of the Zn dopant on the surface of the metal substrate as fine nuclei. Consequently, a symmetric cell incorporating the proposed Zn metal exhibits low overpotentials of similar to 27.2 and similar to 99.7 mV without Zn dendrites over 250 to 8000 cycles at current densities of 1.0 and 10.0 mA cm(-2), respectively. The developed Zn/MnO2 full cell exhibits superior capacity retentions of 97.5% and 84.0% with average Coulombic efficiencies of 99.96% after 1000 and 3000 cycles, respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据