首页|A Tip-Inhibitor Interphase Embedded with Soluble Polysulfides for High-Voltage Li Metal Batteries
A Tip-Inhibitor Interphase Embedded with Soluble Polysulfides for High-Voltage Li Metal Batteries
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维普
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The high-voltage battery has now become a goal in order to meet the demands for high energy density.However,the severe side reactions between Li metal and carbonate-based electrolytes in this system result in unstable interphase,leading to non-uniform Li-ion flux and thus aggravating the dendrite growth of Li.The protect interphase,traditional solid electrolyte interface(SEI),is a loose solid layer consisted of many components,which generally does not possess the function of preventing the lithium budding.Herein,based on polysulfide solubility in ester,we proposed a strategy to eliminate the dendrite by constructing a unique SEI in which the dynamic polysulfides were in situ formed and encapsuled.For this purpose,a 2-fluorophenylsulfur pentafluoride(2-FSPF)was employed as an additive in carbonate-based electrolyte that can be decomposed electrochemically during battery operation to form such a polysulfide-rich interphase.These polysulfides with certain fluidity can adhere to dynamically the budding tip of Li metal,as a so-called tip-inhibitor,when the local current density of the tip rising,thus to hinder Li+diffusion toward the tip,resulting in inhibiting the further growth of Li dendrites and leveling the Li deposition.At the current density of 1 mA cm-2,the average Coulombic efficiency of Li//Cu cells is as high as 98.39％during 600 cycles,and the stable cycling of Li//Li symmetric cell reaches 3500 h.Furthermore,due to the high anodic stability,the Li//high-voltage LiCoO2(LCO)full cells and Li-O2 battery achieve excellent cycle performance with lean electrolyte.
carbonate-based electrolytefree-dendritehigh reversibilityhigh-voltage batterylithium metal anode
State Key Laboratory of Physical Chemistry of Solid Surfaces,Department of Chemistry,Collaborative Innovation Center of Chemistry for Energy Materials(i-ChEM),Engineering Research Centre of Electrochemical Technologies of Ministry of Education,College of Chemistry and Chemical Engineering Xiamen University,Xiamen 361005,China
College of Chemistry,Zhengzhou University,Zhengzhou 450001,China
维普
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