For lithium metal batteries(LMBs),the intrinsic issues of lithium dendrites and an unstable interface between the lithium metal anode and electrolyte pose severe safety risks.In this study,a novel strategy is proposed...For lithium metal batteries(LMBs),the intrinsic issues of lithium dendrites and an unstable interface between the lithium metal anode and electrolyte pose severe safety risks.In this study,a novel strategy is proposed for modifying the lithium surface using the decavanadate Na_(6)V_(10)O_(28)·18H_(2)O(V_(10))as a protective layer.Constructing a V_(10) artificial solid electrolyte interface(ASEI)protective layer on lithium metal is a simplified and effective strategy for suppressing the growth of lithium dendrites.During the lithium plating/stripping process,V_(10) reversibly transforms into Li_(x)[V_(10)O_(28)](x=6-9),serving as an“ion sponge”to absorb a large amount of lithium ions to compensate for the shortage of lithium ions on the anode surface.Therefore,the electric field strength on the lithium anode surface is adjusted to suppress dendrite growth.Additionally,V10 accelerates the desolvation of lithium ions from solvent clusters,which contributes to the homogeneous migration of lithium ions.Consequently,Li//Li symmetric cells using V10 modified foils exhibit stable cycling for 1200 h under the conditions of a current density of 5 mA cm^(-2) and an areal capacity of 1 mA h cm^(-2),with an overpotential of only 110 mV.The assembled Li-S cells demonstrate excellent rate performance,achieving the reversible capacity of 470 mA h g^(-1) under 5C.展开更多
锂金属负极和碳酸酯类电解液之间不稳定的界面是限制高比能锂金属电池循环寿命的关键挑战.本文使用含苯环的双酚A乙氧基化物二甲基丙烯酸酯(BAED)交联剂调节聚(丙烯酸六氟丁酯)(PHFBA),设计了一种弹性人造固体电解质中间相(RASEI)来解...锂金属负极和碳酸酯类电解液之间不稳定的界面是限制高比能锂金属电池循环寿命的关键挑战.本文使用含苯环的双酚A乙氧基化物二甲基丙烯酸酯(BAED)交联剂调节聚(丙烯酸六氟丁酯)(PHFBA),设计了一种弹性人造固体电解质中间相(RASEI)来解决这个问题.刚性BAED分子可以对柔性PHBA基体进行调控,实现从600%伸长率到90%压缩率的卓越回弹性,并具有超过2 MPa的高杨氏模量.RASEI可以适应锂金属较大的体积变化,并确保电池运行过程中锂金属与RASEI之间的紧密接触,促进均匀的锂沉积并减少副反应.因此,经过RASEI修饰的Li‖Li对称电池可以在1 mA cm^(-2)和1 mAh cm^(-2)下实现超过500小时的长期循环.对循环后锂金属进行测试分析表明锂枝晶的生长得到了有效的抑制.此外,搭配20 mg cm^(-2)高阴极负载的NCM811软包电池在1 C下,经过200次循环后容量保持率超过85%.展开更多
基金the National Natural Science Foundation of China(22201098,22471095 and 22172063)the Natural Science Foundation of Shandong Province(ZR2021QB005 and ZR2021MB008)the Jinan City“New University 20”Project(202228113).
文摘For lithium metal batteries(LMBs),the intrinsic issues of lithium dendrites and an unstable interface between the lithium metal anode and electrolyte pose severe safety risks.In this study,a novel strategy is proposed for modifying the lithium surface using the decavanadate Na_(6)V_(10)O_(28)·18H_(2)O(V_(10))as a protective layer.Constructing a V_(10) artificial solid electrolyte interface(ASEI)protective layer on lithium metal is a simplified and effective strategy for suppressing the growth of lithium dendrites.During the lithium plating/stripping process,V_(10) reversibly transforms into Li_(x)[V_(10)O_(28)](x=6-9),serving as an“ion sponge”to absorb a large amount of lithium ions to compensate for the shortage of lithium ions on the anode surface.Therefore,the electric field strength on the lithium anode surface is adjusted to suppress dendrite growth.Additionally,V10 accelerates the desolvation of lithium ions from solvent clusters,which contributes to the homogeneous migration of lithium ions.Consequently,Li//Li symmetric cells using V10 modified foils exhibit stable cycling for 1200 h under the conditions of a current density of 5 mA cm^(-2) and an areal capacity of 1 mA h cm^(-2),with an overpotential of only 110 mV.The assembled Li-S cells demonstrate excellent rate performance,achieving the reversible capacity of 470 mA h g^(-1) under 5C.
基金supported by National Key R&D Program of China(2023YFB2503801)the National Natural Science Foundation of China(Grant Nos.52302253,and 5202780089)+2 种基金the Key Program of the National Natural Science Foundation of China(Grant No.52231009)the Fundamental Research Funds for the Central Universities(HUST:2172020kfyXJJS089)Key R&D Program of Hubei Province(2023BAB028)。
文摘锂金属负极和碳酸酯类电解液之间不稳定的界面是限制高比能锂金属电池循环寿命的关键挑战.本文使用含苯环的双酚A乙氧基化物二甲基丙烯酸酯(BAED)交联剂调节聚(丙烯酸六氟丁酯)(PHFBA),设计了一种弹性人造固体电解质中间相(RASEI)来解决这个问题.刚性BAED分子可以对柔性PHBA基体进行调控,实现从600%伸长率到90%压缩率的卓越回弹性,并具有超过2 MPa的高杨氏模量.RASEI可以适应锂金属较大的体积变化,并确保电池运行过程中锂金属与RASEI之间的紧密接触,促进均匀的锂沉积并减少副反应.因此,经过RASEI修饰的Li‖Li对称电池可以在1 mA cm^(-2)和1 mAh cm^(-2)下实现超过500小时的长期循环.对循环后锂金属进行测试分析表明锂枝晶的生长得到了有效的抑制.此外,搭配20 mg cm^(-2)高阴极负载的NCM811软包电池在1 C下,经过200次循环后容量保持率超过85%.
