Inorganic‐Rich and Flexible Solid‐Electrolyte Interphase Formed Over Dipole‐Dipole Interaction for Highly Stable Lithium‐Metal Anodes. (10th August 2022)

• Record Type: Journal Article
• Authors: Zhu, Jinqi; Cui, Zhe; He, Shu‐Ang; Wang, Hao; Gao, Mengluan; Wang, Wenqing; Yang, Jianmao; Xu, Xintong; Hu, Junqing; Lu, Aijiang; Zou, Rujia
• Is Part Of: Advanced functional materials. Volume 32:Number 44(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-10
• Subjects: dipole‐dipole interaction -- lithium dendrites -- lithium metal batteries -- solid electrolyte interfaces; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202205304
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The uncontrollable lithium (Li) dendrite growth and unstable solid electrolyte interfaces (SEI) hinder the practical application of Li metal batteries (LMBs). Herein, a PAN/CNTs‐based SiO2 ‐modified vertical‐cavity film (PCS‐VCF) with a network structure is prepared by a simple spin‐coating process to address these challenges. This new current collector with a polar lithiophilic network stabilizes the Li metal anodes by regulating the chemical environment in carbonate electrolytes. The dipole interaction between the CN groups and the CO groups reduces the high reactivity of the carbonates in the electrolyte, forming an SEI layer with higher inorganic components and enhancing the stability of the electrode/electrolyte interface. The special vertical‐cavity network structure inside the current collector can decrease local current density and suppress the huge volume expansion of Li metal during the cycling process. Consequently, a high‐performance Li metal anode with dendrite‐free morphology is achieved (over 1500 cycles with low overpotential at 20 mA cm −2 in symmetric cells). Furthermore, full cell with the LiNi0.8 Co0.1 Mn0.1 O2 cathode delivers a stable capacity of 164.5 mA h g −1 for 500 cycles at 5 C, with a capacity decay rate of 0.077% per cycle. Abstract : The vertical‐cavity current collector that forms a dipole‐dipole interaction with the electrolyte exhibits excellent electrochemical performance in lithium metal batteries.