【摘 要】
：
Electrolyte chemistry offers the opportunity to regulate the solid electrolyte interphase (SEI) and Li+ sol-vation,which is considered to be crucial to the growth of lithium crystals for safe lithium metal batteries(LMBs).Structurally tunable characterist
【机 构】
：
School of Physics and Electronics,Hunan University,Changsha 410082,Hunan,China;School of Materials S
论文部分内容阅读
Electrolyte chemistry offers the opportunity to regulate the solid electrolyte interphase (SEI) and Li+ sol-vation,which is considered to be crucial to the growth of lithium crystals for safe lithium metal batteries(LMBs).Structurally tunable characteristics of ionic liquids (ILs) from anion type,cationic substituent chain length and cationic substituents,will contribute this field.Here,we explore the influence mecha-nism of imidazole-based lLs as electrolyte additives on Li+ solvation and the formation of SEI.ILs can par-ticipate into the formation of efficient SEI,together with cathode electrolyte interphase (CEI).Moreover,ILs can also regulate the sheath structure of Li+ solvation,to fasten the kinetics of Li.Furthermore,the imidazole-based cations with long alkyl chain can form an electrostatic shield around newly formed Li nucleus,and suppress further Li plating at this site.Under the optimized condition,the 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([OMIm]TFSI) additive shows the best ability to enhance the electrochemical performance,endowing the Li‖Li symmetric cell with a stable life (over 800 h) at 0.5 mA cm-2 and the Li‖LiNi0.6Mn0.2Co0.2O2 (NMC622) full cell with a high capacity of 141.7 mAh g-1 after 200 cycles at 0.5 C.
其他文献
LiNixCoyMnzO2 (NCM,x + y + z =1) is one of the most promising cathode candidates for high energy den-sity lithium-ion batteries (LIBs).Due to the potential in enhancing energy density and cyclic life of LIBs,Ni-rich layered NCM (NCM,x ≥ 0.6) have garnered
Piezocatalytic materials have been widely used for catalytic hydrogen evolution and purification of organic contaminants.However,most studies focus on nano-size and/or polycrystalline catalysts,suffer-ing from aggregation and neutralization of internal pi
Silica nanosheets (SN) derived from natural vermiculite (Verm) were successfully incorporated into polyethersulfone-polyvinylpyrrolidone (PES-PVP) polymer to fabricate high-temperature proton exchange membranes (HT-PEMs).The content of SN filler was varie
The introduction of spinel phase to form the layered-spinel structure (LSS) is an effective way to improve the electrochemical performance of Li-and Mn-rich layered oxides (LMR).But is this structure universal for all LMR systems?In this work,different Mn
Potassium-ions batteries (PIBs) are attracting increasing attention as up-and-coming youngster in large-scale grid-level energy storage benefiting from its low-cost and high energy density.Nevertheless,enough researches regarding indispensable cathode mat
Metal phosphides have shown great potential for potassium-ion batteries because of their high theoret-ical specific capacity.Nevertheless,most of the metal phosphide anodes are plagued by rapid capacity decay (caused by the large volume changes during the
Exploring nonprecious electrocatalysts for water splitting with high efficiency and durability is critically important.Herein,bimetallic phosphides are encapsulated into graphitized carbon to construct a C@NiCoP composite nanoarray using bimetallic metal-
Lithium metal batteries are considered as high energy density battery systems with very promising pro-spects and have been widely studied.However,The uncontrollable plating/stripping behavior,infinite volume change and dendrites formation of lithium metal
In this work,we have successfully prepared a novel separator modified with N,S co-doped carbon frame-work (named NSPCF) with confined CoS2 nanoparticles and rooted carbon nanotubes material (named NSPCF@CoS2) to apply for high-performance Lithium-Sulfur b
Propane dehydrogenation (PDH),employing Pt-or Cr-based catalysts,represents an emerging industrial route for propylene production.Due to the scarcity of platinum and the toxicity of chromium,alternative PDH catalysts are being pursued.Herein,we report the