Super-resolved dynamics of isolated zinc formation during extremely fast electrochemical deposition/dissolution processes

Mao，Jiaxin1; Li，Guopeng1; Saqib，Muhammad1,3; Xu，Jiantie2; Hao，Rui1

2022-10-12

10.1039/d2sc04877a

Chemical Science   影响因子和分区

2041-6520

2041-6539

The development of zinc-air batteries with high-rate capability and long lifespan is critically important for their practical use, especially in smart grid and electric vehicle application. The formation of isolated zinc (i-Zn) on the zinc anode surface, however, could easily lead to deteriorated performance, such as rapid capacity decay. In particular, under the fast charging/discharging conditions, the electrochemical activities on the anode surface are complicated and severely suppressed. Thus, it is highly desirable to deeply understand the formation mechanism of i-Zn and its relationship with the electrochemical performance during extremely high-rate cycling. Herein, we employed a super-resolution dark-field microscope to in situ analyze the evolution dynamics of the electrolyte-Zn interface during the extremely fast electrochemical deposition/dissolution processes. The unique phenomenon of nanoscopic i-Zn generation under the condition is unveiled. We discovered that the rapid conversion of nanoscopic i-Zn fragments into passivated products could greatly exacerbate the concentration polarization process and increase the overpotential. In addition, the role of large-sized i-Zn fragments in reducing the coulombic efficiency is further elucidated. This information could aid the rational design of highly effective anodes for extremely high-rate zinc-based batteries and other battery systems.

SCI

英语

NI论文

第一 ; 通讯

National Natural Science Foundation of China["22150410330","22074059"] ; Pearl River Talent Recruitment Program[2019QN01L096] ; Guangdong Innovative and Entrepreneurial Research Team Program[2019ZT08L075]

Chemistry

Chemistry, Multidisciplinary

WOS:000871393600001

ROYAL SOC CHEMISTRY

2-s2.0-85141465352

Scopus

1.Department of Chemistry,Research Center for Chemical Biology and Omics Analysis,Southern University of Science and Technology,Shenzhen,518055,China
2.School of Environment and Energy,South China University of Technology,Guangzhou,510640,China
3.Institute of Chemistry,Khwaja Fareed University of Engineering & Information Technology,Rahim Yar Khan,64200,Pakistan

Mao，Jiaxin,Li，Guopeng,Saqib，Muhammad,et al. Super-resolved dynamics of isolated zinc formation during extremely fast electrochemical deposition/dissolution processes[J]. Chemical Science,2022,111.

Mao，Jiaxin,Li，Guopeng,Saqib，Muhammad,Xu，Jiantie,&Hao，Rui.(2022).Super-resolved dynamics of isolated zinc formation during extremely fast electrochemical deposition/dissolution processes.Chemical Science,111.

Mao，Jiaxin,et al."Super-resolved dynamics of isolated zinc formation during extremely fast electrochemical deposition/dissolution processes".Chemical Science 111(2022).