Uniform Lithium Deposition Induced by ZnFx(OH)y for High-Performance Sulfurized Polyacrylonitrile-Based Lithium-Sulfur Batteries

Wanming Teng; Yanyan Li; Ting Ma; Xiuyun Ren; Ding Nan; Jun Liu; Xiaohu Wang; Qin Yang; Jiaojiao Deng

doi:10.3390/polym14214494

Uniform Lithium Deposition Induced by ZnF_x(OH)_y for High-Performance Sulfurized Polyacrylonitrile-Based Lithium-Sulfur Batteries

Polymers (Basel). 2022 Oct 24;14(21):4494. doi: 10.3390/polym14214494.

Authors

Wanming Teng^{1

2}, Yanyan Li³, Ting Ma^{1

2}, Xiuyun Ren⁴, Ding Nan^{1

2}, Jun Liu², Xiaohu Wang^{2

5}, Qin Yang⁶, Jiaojiao Deng⁶

Affiliations

¹ College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
² Inner Mongolia Key Laboratory of Graphite and Graphene for Energy Storage and Coating, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China.
³ State Key Laboratory of High-Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China.
⁴ College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China.
⁵ Rising Graphite Applied Technology Research Institute, Chinese Graphite Industrial Park-Xinghe, Ulanqab 013650, China.
⁶ Shenzhen Key Laboratory on Power Battery Safety and Shenzhen Geim Graphene Center, Tsinghua Shenzhen International Graduate School (SIGS), Shenzhen 518071, China.

Abstract

Lithium metal batteries are emerging as the next generation of high-density electrochemical energy storage systems because of the ultra-high specific capacity and ultra-low electrochemical potential of the Li metal anode. However, the uneven Li deposition on commercial Cu current collectors result in low Coulombic efficiencies (CEs) and poor cycle life. In this research, we proposed the modification of ZnF_x(OH)_y on Cu foils to expand the lifespan. As-generated ZnLi alloy and LiF could promote uniform Li nucleation and deposition, thus resulting in an improved Li plating/stripping CE and extended cycle life. The Li-S battery with sulfurized polyacrylonitrile cathode and Li-ZnF_x(OH)_y@Cu anode (N/P ratio of 1.5:1) maintains 95% capacity after 60 cycles, proving the feasibility of ZnF_x(OH)_y@Cu for practical applications.

Keywords: Li-S battery; ZnFx(OH)y modification; current collector.

Abstract

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