Achieving Uniform Li Plating/Stripping at Ultrahigh Currents and Capacities by Optimizing 3D Nucleation Sites and Li2 Se-Enriched SEI

Jiaqi Cao; Yonghui Xie; Yang Yang; Xinghui Wang; Wangyang Li; Qiaoli Zhang; Shun Ma; Shuying Cheng; Bingan Lu

doi:10.1002/advs.202104689

Achieving Uniform Li Plating/Stripping at Ultrahigh Currents and Capacities by Optimizing 3D Nucleation Sites and Li₂ Se-Enriched SEI

Adv Sci (Weinh). 2022 Mar;9(9):e2104689. doi: 10.1002/advs.202104689. Epub 2022 Jan 24.

Authors

Jiaqi Cao¹, Yonghui Xie¹, Yang Yang¹, Xinghui Wang^{1

2

3}, Wangyang Li¹, Qiaoli Zhang⁴, Shun Ma¹, Shuying Cheng^{1

3}, Bingan Lu⁵

Affiliations

¹ College of Physics and Information Engineering, Institute of Micro-Nano Devices and Solar Cells, Fuzhou University, Fuzhou, 350108, China.
² Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, 350108, China.
³ Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou, 213164, China.
⁴ College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China.
⁵ School of Physics and Electronics, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan, 410082, China.

Abstract

Lithium (Li) has garnered considerable attention as an alternative anodes of next-generation high-performance batteries owing to its prominent theoretical specific capacity. However, the commercialization of Li metal anodes (LMAs) is significantly compromised by non-uniform Li deposition and inferior electrolyte-anode interfaces, particularly at high currents and capacities. Herein, a hierarchical three-dimentional structure with CoSe₂ -nanoparticle-anchored nitrogen-doped carbon nanoflake arrays is developed on a carbon fiber cloth (CoSe₂ -NC@CFC) to regulate the Li nucleation/plating process and stabilize the electrolyte-anode interface. Owing to the enhanced lithiophilicity endowed by CoSe₂ -NC, in situ-formed Li₂ Se and Co nanoparticles during initial Li nucleation, and large void space, CoSe₂ -NC@CFC can induce homogeneous Li nucleation/plating, optimize the solid electrolyte interface, and mitigate volume change. Consequently, the CoSe₂ -NC@CFC can accommodate Li with a high areal capacity of up to 40 mAh cm^-2 . Moreover, the Li/CoSe₂ -NC@CFC anodes possess outstanding cycling stability and lifespan in symmetric cells, particularly under ultrahigh currents and capacities (1600 h at 10 mA cm^-2 /10 mAh cm^-2 and 5 mA cm^-2 /20 mAh cm^-2 ). The Li/CoSe₂ -NC@CFC//LiFePO₄ full cell delivers impressive long-term performance and favorable flexibility. The developed CoSe₂ -NC@CFC provides insights into the development of advanced Li hosts for flexible and stable LMAs.

Keywords: MOF; SEI; flexible lithium metal anodes; lithium F=nucleation sites; lithium metal battery.

Abstract

Grants and funding