Improving Interface Stability of Si Anodes by Mg Coating in Li-Ion Batteries

Li, Zhifei; Stetson, Caleb; Teeter, Glenn; Norman, Andrew; Ha, Yeyoung; Tremolet de Villers, Bertrand J.; Huey, Zoey; Walker, Patrick; Han, Sang-Don; DeCaluwe, Steven C.; Jiang, Chun-Sheng; Burrell, Anthony K.; Zakutayev, Andriy

doi:10.1021/acsaem.0c02298

Improving Interface Stability of Si Anodes by Mg Coating in Li-Ion Batteries

Journal Article · Tue Nov 24 00:00:00 EST 2020 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.0c02298· OSTI ID:1760655

^[1]; ^[2]; Teeter, Glenn ^[1]; ^[1]; ^[1]; ^[1]; Huey, Zoey ^[2]; Walker, Patrick ^[1]; ^[1]; ^[3]; ^[1]; Burrell, Anthony K. ^[1]; ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
Colorado School of Mines, Golden, CO (United States)

Silicon (Si) is a promising anode material for high-energy-density lithium-ion batteries (LIBs), but its short calendar life and poor cycling performance prevent its large-scale adoption. Introducing magnesium (Mg) salt into the electrolyte has been recently shown to form a ternary Li–Mg–Si Zintl phase upon lithiation of Si and improve the cycling performance. However, the ternary Zintl phase formation mechanism and its impact on the solid electrolyte interphase (SEI) are not yet well understood. In this work, we demonstrate the formation of a ternary Li–Mg–Si Zintl phase by Mg coating of the Si anode, where Mg diffuses into the Si film upon deposition and intermixes further during the lithiation process. The presence of the Zintl phase improves the interface stability, alters the nature of the SEI, and enhances the cycling performance of the Si anode. This study provides insights into the formation mechanism of the ternary Zintl phase and guidelines for the future design of Si anodes.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1760655

Report Number(s):: NREL/JA--5K00-76811; MainId:9472; UUID:2717d67a-990a-41c3-b96f-9b4c6a9229ac; MainAdminID:18867

Journal Information:: ACS Applied Energy Materials, Journal Name: ACS Applied Energy Materials Journal Issue: 12 Vol. 3; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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