A high-performance free-standing Zn anode for flexible zinc-ion batteries

Chenxi Gao; Jiawei Wang; Yuan Huang; Zixuan Li; Jiyan Zhang; Haoze Kuang; Shuhao Chen; Zanxiang Nie; Shuyi Huang; Wei Li; Yubo Li; Shunyu Jin; Yuanjiang Pan; Teng Long; Jikui Luo; Hang Zhou; Xiaozhi Wang

doi:10.1039/D1NR01266E

A high-performance free-standing Zn anode for flexible zinc-ion batteries†

Chenxi Gao,‡^ab Jiawei Wang,‡^a Yuan Huang,*^c Zixuan Li,^a Jiyan Zhang,^a Haoze Kuang,^b Shuhao Chen,^b Zanxiang Nie,^d Shuyi Huang,^b Wei Li,^b Yubo Li,^b Shunyu Jin,^e Yuanjiang Pan,

^f Teng Long,^g Jikui Luo,^b Hang Zhou

*^a and Xiaozhi Wang

*^b

Author affiliations

* Corresponding authors

^a School of Electronic and Computer Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
E-mail: zhouh81@pkusz.edu.cn

^b College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
E-mail: xw224@zju.edu.cn

^c School of Microelectronics Science and Technology, Sun Yat-Sen University Guangzhou, PR China
E-mail: huangy723@mail.sysu.edu.cn

^d Zinergy Shenzhen Ltd, Baoan, Shenzhen, China

^e Center for Micro-and Nanoscale Research and Fabrication, University of Science and Technology of China, Hefei, China

^f Department of Chemistry, Zhejiang University, Hangzhou, China

^g Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK

Abstract

Zinc-ion batteries (ZIBs) have attracted significant attention owing to their high safety, high energy density, and low cost. ZIBs have been studied as a potential energy device for portable and flexible electronics. Here, a highly flexible free-standing Zn anode is fabricated using a simple spin-coating technique, and its application in ZIBs is demonstrated. The free-standing Zn anode precursor is formed by mixing Zn particles with carbon nanotubes and poly(vinylidene fluoride)-co-hexafluoropropylene (PVDF-HFP). The hexafluoropropylene group in PVDF-HFP improves the mechanical properties of the free-standing Zn anode, whereas the carbon nanotubes created percolation conduction in the composite electrode, leading to an increased electrical conductivity of the anode. Owing to the excellent electrical conductivity and high specific surface area of the free-standing Zn anode, ZIBs with high capacity, rate performance, and mechanical flexibility are achieved. The volumetric energy density of the ZIBs reaches 8.22 mW h cm⁻³ with a battery thickness of 0.4 mm. This work demonstrates that free-standing Zn anodes are promising anodes for flexible ZIBs.

Nanoscale

A high-performance free-standing Zn anode for flexible zinc-ion batteries†

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A high-performance free-standing Zn anode for flexible zinc-ion batteries

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