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Interface defect chemistry enables dendrite-free lithium metal anodes.

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Bibliographic Details
Title:	Interface defect chemistry enables dendrite-free lithium metal anodes.
Authors:	Mu, Tiansheng¹ (AUTHOR), Lu, Hongfu¹ (AUTHOR), Ren, Yang¹ (AUTHOR), Wan, Xin¹ (AUTHOR), Xu, Xing² (AUTHOR), Tan, Siping² (AUTHOR), Ma, Yulin¹ (AUTHOR) mayulin@hit.edu.cn, Yin, Geping¹ (AUTHOR)
Source:	Chemical Engineering Journal. Jun2022:Part 1, Vol. 437, pN.PAG-N.PAG. 1p.
Subjects:	Surface chemistry, Lithium, Anodes, Metals, Diffusion kinetics, Hydrogen evolution reactions, Lithium cells, Surface coatings
Abstract:	• An artificial protective layer with interface defects is proposed; • Interface defect chemistry promotes the lithium ions diffusion kinetics; • Interface oxygen defect achieve the ultra-long electrochemical plating/stripping stability; • The electrochemical performance of full cells has been significantly improved. Lithium dendrite can cause battery failure and safety risks, which is a major obstacle for the commercial application of lithium metal anodes. Herein, an artificial protective layer with interface defects is proposed to promote the interfacial electrochemical kinetics and achieve the ultra-long electrochemical plating/stripping stability. Taking titanium oxide (TiO 2) as a research object, the interfacial oxygen-deficient TiO 2 coating (H-TiO 2) shows the faster lithium ion diffusion kinetics compared to the pristine TiO 2 layer and fresh lithium metal anode, and this interfacial defect chemistry can facilitate homogenous lithium ion flux and regulate lithium metal dendrite-free electrodeposition. Specifically, the H-TiO 2 protective layer endows lithium metal anodes ultra-long cycling stability up to 1990 h at 2.0 mA cm−2 with a low overpotential of 27.5 mV. Remarkably, the artificial H-TiO 2 coating improves the cycling stability (97.5 mAh g−1 after 350cycles) and rate performance (68.5 mAh g−1 at 4.0C) of full cells paired with LiFePO 4 cathode. More importantly, this work opens a door for regulating lithium metal reversible electrodeposition by interface defect chemistry. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	• An artificial protective layer with interface defects is proposed; • Interface defect chemistry promotes the lithium ions diffusion kinetics; • Interface oxygen defect achieve the ultra-long electrochemical plating/stripping stability; • The electrochemical performance of full cells has been significantly improved. Lithium dendrite can cause battery failure and safety risks, which is a major obstacle for the commercial application of lithium metal anodes. Herein, an artificial protective layer with interface defects is proposed to promote the interfacial electrochemical kinetics and achieve the ultra-long electrochemical plating/stripping stability. Taking titanium oxide (TiO 2) as a research object, the interfacial oxygen-deficient TiO 2 coating (H-TiO 2) shows the faster lithium ion diffusion kinetics compared to the pristine TiO 2 layer and fresh lithium metal anode, and this interfacial defect chemistry can facilitate homogenous lithium ion flux and regulate lithium metal dendrite-free electrodeposition. Specifically, the H-TiO 2 protective layer endows lithium metal anodes ultra-long cycling stability up to 1990 h at 2.0 mA cm−2 with a low overpotential of 27.5 mV. Remarkably, the artificial H-TiO 2 coating improves the cycling stability (97.5 mAh g−1 after 350cycles) and rate performance (68.5 mAh g−1 at 4.0C) of full cells paired with LiFePO 4 cathode. More importantly, this work opens a door for regulating lithium metal reversible electrodeposition by interface defect chemistry. [ABSTRACT FROM AUTHOR]
ISSN:	13858947
DOI:	10.1016/j.cej.2022.135109