Thick‐Network Electrode: Enabling Dual Working Voltage Plateaus of Zn‐ion Micro‐Battery with Ultrahigh Areal Capacity

Author:

Wu Yudong1,He Ningning2,Liang Guojin3,Zhang Chaofeng4,Liang Changhao2,Ho Derek56,Wu Mingzai1,Hu Haibo1ORCID

Affiliation:

1. School of Materials Science and Engineering Key Laboratory of Structure and Functional Regulation of Hybrid Materials Ministry of Education Anhui University Hefei 230601 China

2. Institute of Solid State Physics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei 230031 China

3. Faculty of Materials Science and Energy Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

4. Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China

5. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong 999077 China

6. Hong Kong Center for Cerebro‐Cardiovascular Health Engineering Hong Kong 999077 China

Abstract

AbstractAqueous Zn‐ion micro‐batteries (AZMBs) have been recently shown to be promising integrated and safe micropower sources for portable electronics but with wide commercial adoption greatly constrained by their relatively low areal capacity. Although increasing the electrode thickness is proposed, the performance is compromised due to sluggish reaction kinetics, slow ion diffusion rate, and underutilization of active materials. Herein, the technique of utilizing a 3D thick‐network electrode, consisting of closely interweaved MnO2 nanowires (MnO2 NWs), silver nanowires (AgNWs), and carbon nanotubes (CNTs) is presented. The technique readily enables electrode realization up to a thickness of 351 µm, where the porous structure, high hydrophilicity, and fast electrolyte infiltration jointly contribute to fast kinetics. Matching with a Zn metal anode, the prototyped AZMBs acquire an ultra‐high areal capacity/power density of 809 µAh cm−2/1951 µW cm−2. Additionally, as MnO2 NWs and AgNWs collectively participate in the reaction as active substances, the AZMBs deliver dual voltage plateaus to further improve the areal energy density, realizing a maximum value of 896 µWh cm−2. The 3D thick‐network electrode supporting dual working voltage plateaus can provide a path forward for developing AZMBs with simultaneously ultra‐high areal capacity and energy density.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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