title: Nanostructured Carbon Nitride Polymer-Reinforced Electrolyte To Enable Dendrite-Suppressed Lithium Metal Batteries.
abstract: Lithium metal batteries (LMBs) containing S, O2, and fluoride cathodes are attracting increasing attention owing to their much higher energy density than that of Li-ion batteries. However, current limitation for the progress of LMBs mainly comes from the uncontrolled formation and growth of Li dendrites at the anode side. In order to suppress dendrite growth, exploring novel nanostructured electrolyte of high modulus without degradation of Li-electrolyte interface appears to be a potential solution. Here we propose a lightweight polymer-reinforced electrolyte based on graphitic carbon nitride (g-C3N4) mesoporous microspheres as electrolyte filler [bis(trifluoromethanesulfonimide) lithium salt/di(ethylene glycol) dimethyl ether mixed with g-C3N4, denoted as LiTFSI-DGM-C3N4] for the first time. This nanostructured electrolyte can effectively suppress lithium dendrite growth during cycling, benefiting from the high mechanical strength and nanosheet-built hierarchical structure of g-C3N4. The Li/Li symmetrical cell based on this slurrylike electrolyte enables long-term cycling of at least 120 cycles with a high capacity of 6 mA·h/cm2and small plating/stripping overpotential of ∼100 mV at a high current density of 2 mA/cm2. g-C3N4filling also enables a separator(Celgard)-free Li/FeS2cell with at least 400 cycles. The 3D geometry of g-C3N4shows advantages on interfacial resistance and Li plating/stripping stability compared to its 2D geometry.
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, China.|University of Chinese Academy of Sciences , Beijing 100039, China.
authors.forename: Jiulin
authors.initials: J
authors.lastname: Hu
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, China.|University of Chinese Academy of Sciences , Beijing 100039, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tian
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050, China.
authors.forename: Chilin
authors.identifier: http://orcid.org/0000-0002-5587-8617
authors.initials: C
authors.lastname: Li
keywords: Li dendrite suppressing; Li metal batteries; carbon nitride polymer; hybrid electrolyte; nanostructured electrolyte