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Bottom-top channeling Li nucleation and growth by 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,   Zizhong Zhu  and  Dong-Liang Peng  

Abstract

Li metal anode is undergoing a renaissance due to its ultra-high specific capacity and the lowest reduction potential. Yet, the practical application of Li metal anode is still challenged by Li dendrite growth and low coulombic efficiency (CE). Herein, a gradient Si-modified carbon paper (GSCP) is proposed via magnetic sputtering to address these issues, in which the content of lithiophilic Si gradually decreases from bottom to up of 3D host. Such gradient lithiophilic structure can induce Li metal selectively nucleate and grow at bottom firstly then to top part of GSCP, realizing stable Li plating/stripping and high space utilization of 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, and a prolonged lifespan (1350 h) with a low overpotential (~15 mV). Remarkably, the GSCP@Li|Li4Ti5O12 full cell exhibits a high capacity retention of 84.5% after 5000 cycles at 10 C rate.

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Publication details

The article was received on 14 Oct 2019, accepted on 01 Dec 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TA11311H
J. Mater. Chem. A, 2019, Accepted Manuscript

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

    X. Yan, Q. Zhang, W. Xu, Q. Xie, P. Liu, Q. Chen, H. Zheng, L. Wang, Z. Zhu and D. Peng, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA11311H

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