Affiliation:
1. Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China
2. National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing Haidian Beijing 100190 China
3. Laboratory of Beam Technology and Energy Materials Faculty of Arts and Sciences Beijing Normal University Zhuhai 519087 China
4. Guangdong Dtech Technology Co., Ltd. Dongguan 523940 China
Abstract
AbstractSurface modification of Cu current collectors (CCs) is proven to be an effective method for protecting lithium metal anodes. However, few studies have focused on the quality and efficiency of modification layers. Herein, a novel home‐made filtered cathode vacuum arc (FCVA) co‐deposition system with high modification efficiency, good repeatability and environmental friendliness is proposed to realize the wide range regulation of film composition, structure and performance. Through this system, ZnMgTiAl quaternary alloy films, which have good affinity with Li are successfully constructed on Cu CCs, and the fully enhanced electrochemical performances are achieved. Symmetrical cells constructed with modified CCs maintained a fairly low voltage hysteresis of only 13 mV after 2100 h at a current density of 1 mA cm−2. In addition, the capacity retention rate is as high as 75.0% after 100 cycles in the full cells. The influence of alloy films on the dynamic evolution process of constructing stable artificial solid electrolyte interphase (SEI) layer is revealed by in situ infrared (IR) spectroscopy. This work provides a promising route for designing various feasible modification films for LMBs, and it displays better industrial application prospects than the traditional chemical methods owing to the remarkable controllability and scale‐up capacity.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation