Title: “Top-Down” Li Deposition Pathway Enabled by an Asymmetric Design for Li Composite Electrode

Abstract

Designing Li composite electrodes with host frameworks for accommodating Li metal has been considered to be an effective approach to suppress Li dendrites. Herein, an asymmetric design of a Mo net/Li metal film (MLF) composite electrode is developed by an inverted thermal infusion method. The asymmetric MLF electrode has a dense oxide passivated layer on the top side, a porous Mo net matrix on the back side, and active Li layer in between. The back side has a larger specific area and higher electric field than the top side, which contacts with the separator upon cycling, triggering the preferred Li deposition and stripping of the porous back side of the electrode far from the separator. The surface passivation layer on the top side of the electrode as an artificial solid electrolyte interphase ensures the stable contact with the electrolyte and separator. Meanwhile, the porous structure of the supporting Mo net provides enough space for accommodating the volume change during Li deposition and stripping. This asymmetry design enables a unique “top down” growth pathway for Li deposition in the MLF electrode, suppressing the dendrite growth effectively. In conclusion, the design strategy provides a new direction for high-energy dendrite-free Li metal anodes.

Authors:

Yue, Xin-Yang ^[1]; Li, Xun-Lu ^[1]; Bao, Jian ^[1]; Qiu, Qi-Qi ^[1]; Liu, Tongchao ^[2]; Chen, Dong ^[1]; Yuan, Shan-Shan ^[1]; Wu, Xiao-Jing ^[1]; Lu, Jun ^[2]; Zhou, Yong-Ning ^[1]

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+ Show Author Affiliations

1. Fudan Univ., Shanghai (China). Dept. of Materials Science
2. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division

Publication Date:

2019-08-02

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

National Natural Science Foundation of China (NNSFC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

OSTI Identifier:

1574378

Alternate Identifier(s):

OSTI ID: 1546108

Grant/Contract Number:  

AC02-06CH11357; AC02‐06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Advanced Energy Materials

Additional Journal Information:

Journal Volume: 9; Journal Issue: 35

Publisher:

Wiley

Country of Publication:

United States

Language:

English

Subject:

25 ENERGY STORAGE; anodes; asymmetry design; film; lithium metal batteries; molybdenum net