Bottom-top channeling Li nucleation and growth by a gradient lithiophilic 3D conductive host for highly stable Li-metal anodes

Xiaolin Yan; Qingfei Zhang; Wanjie Xu; Qingshui Xie; Pengfei Liu; Qiulin Chen; Hongfei Zheng; Laisen Wang; Zi-Zhong Zhu; Dong-Liang Peng

doi:10.1039/C9TA11311H

Bottom-top channeling Li nucleation and growth by a gradient lithiophilic 3D conductive host for highly stable Li-metal anodes†

Xiaolin Yan,^a Qingfei Zhang,^a Wanjie Xu,^a Qingshui Xie,*^a Pengfei Liu,^a Qiulin Chen,^a Hongfei Zheng,^a Laisen Wang,^a Zi-Zhong Zhu

^b and Dong-Liang Peng

*^a

Author affiliations

* Corresponding authors

^a State Key Lab of Physical Chemistry of Solid Surface, Collaborative Innovation Center of Chemistry for Energy Materials, College of Materials, Xiamen University, Xiamen 36105, China
E-mail: xieqsh@xmu.edu.cn, dlpeng@xmu.edu.cn
Fax: +86-592-2183515
Tel: +86-592-2180155

^b Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen 36105, China

Abstract

Li metal anodes are undergoing a renaissance due to their ultra-high specific capacity and the lowest reduction potential. However, the practical application of Li-metal anodes is still challenged by Li dendrite growth and low coulombic efficiency (CE). Herein, a gradient Si-modified carbon paper (GSCP) made via magnetic sputtering is proposed to address these issues, in which the content of lithiophilic Si gradually decreases from the bottom to the top of the 3D host. Such a gradient lithiophilic structure can cause the Li metal to selectively nucleate and grow at the bottom first and then to the top part of GSCP, realizing stable Li plating/stripping and high space utilization of the 3D host simultaneously. Therefore, the designed GSCP composite anode achieves average CEs of 99.0% (400 cycles) and 97.0% (150 cycles) at 1 and 5 mA cm⁻², respectively, and a prolonged lifespan (1350 h) with a low overpotential (∼15 mV). Remarkably, the GSCP@Li‖Li₄Ti₅O₁₂ full cell exhibits high capacity retention of 84.5% after 5000 cycles at a 10C rate.

This article is part of the themed collection: Journal of Materials Chemistry A HOT Papers

Journal of Materials Chemistry A

Bottom-top channeling Li nucleation and growth by a gradient lithiophilic 3D conductive host for highly stable Li-metal anodes†

Abstract

Associated articles

Supplementary files

Article information

Download Citation

Permissions

Bottom-top channeling Li nucleation and growth by a gradient lithiophilic 3D conductive host for highly stable Li-metal anodes

Social activity

Search articles by author

Spotlight

Advertisements