Facile Synthesis of Tunable Ultra-Thin Anodes for Long-Lasting and High-Energy-Density Lithium Metal Batteries

作     者：Tian, Du Chen, Weimin Shen, Yue Cao, Wenzhu Miao, Wenwen Lai, Zhenghan Chen, Hong Yang, Shanshan Wang, Liang Yu, Faquan 

作者机构：Key Laboratory for Green Chemical Process Ministry of Education Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology Hubei Three Gorges Laboratory Hubei Engineering Research Center for Advanced Fine Chemicals School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430205 China State Key Laboratory of Material Processing and Die and Mold Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Lithium alloys 

摘      要：Thin lithium metal anodes (LMAs) play a crucial role in realizing lithium metal batteries (LMBs) with high-energy-density. However, the commercial production of thin lithium anode continues to face challenges in manufacturing complexities, inadequate reversible capacity and unstable cyclability. Herein, we show a facile and effective strategy to produce ultra-thin LMAs with tunable thickness (10~50 μm), in which the Li-Ag alloy is in-situ formed and uniformly loaded on the cellulose-derived carbon supported reduced graphene oxide (CC-rGO). Density functional theory (DFT) calculations reveal that the Li-Ag alloy has strong adsorption energy and minimal energy barrier for Li diffusion, which can effectively meliorate Li transfer and homogeneous deposition. Due to the advantages of the synergistic effect of Li-Ag alloy modification, the elaborate-designed ultra-thin and 3D structure, the CC-rGO/LixAgy/Li anode facilitates the acceleration of Li-ion transport kinetics, reduce the nucleation barrier and offer adequate active sites, thereby improving the electrochemical characteristics. The CC-rGO/LixAgy/Li symmetric cell exhibits stably Li plating/stripping for 5000 h at 1 mA cm−2. When matched with LiFePO4 cathode, the full cell delivers remarkable cycling reversibility for 900 cycles at 3 C and the negative/positive capacity (N/P) ratio can be down to 1.18. More impressively, the pouch cell reveals an excellent flexibility with maintaining more than 80% capacity over 80 cycles at 0.3 C in folded states. This study provides a promising avenue to developing viable high-energy-density LMBs. © 2024, The Authors. All rights reserved.