Li4Ti5O12 Coating on Copper Foil as Ion Redistributor Layer for Stable Lithium Metal Anode. Issue 13 (26th February 2022)

• Record Type: Journal Article
• Authors: Xiong, Xiaosong; Yan, Wenqi; Zhu, Yusong; Liu, Lili; Fu, Lijun; Chen, Yuhui; Yu, Nengfei; Wu, Yuping; Wang, Bin; Xiao, Rui
• Is Part Of: Advanced energy materials. Volume 12:Issue 13(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-26
• Subjects: electrode interfaces -- ion redistributors -- ionic conductor -- lithium metal anodes; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.202103112
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Lithium metal is regarded as the most promising electrode material for the next generation of energy storage devices. However, low coulombic efficiency and short cycle lifespan caused by the unstable electrode interface have hindered its practical application. Constructing artificial coatings on the anode is one of the most effective approaches for remedying this, but the practical effects are still limited due to their poor regulation of Li + ions transport and complex construction engineering. Herein, an "inverse concentration gradient" concept is put forward to improve the lithium metal anode, especially at high current density. A Li4 Ti5 O12 artificial coating layer is fabricated on copper foil by a simple droplet coating method and a concentrated Li + ions region near the electrode interface in the coating layer is formed in situ after the initial activation process, which alleviates the effects of space charge regions generated by ion depletion on the growth of lithium dendrites. Coupled with high ionic conductivity and "zero strain" characteristics, stable dendrite‐free cycling of lithium metal anodes is achieved even at 5 mA cm −2 in Li/Cu half cell. The unique concentration gradient design provides a new perspective for the interface regulation of advanced lithium metal anodes. Abstract : A Li4 Ti5 O12 artificial coating layer is found to have the characteristics of a reverse concentration gradient, high ionic conductivity, and mechanical stability, which can compensate for the rapid consumption of lithium ions near the electrode interface. Therefore, uniform lithium deposition, high coulombic efficiency, and long cycling life of a lithium metal anode under high current density (5.0 mA cm −2 ) are realized successfully.