Novel single-ion conducting polymer electrolytes with high toughness and high resistance against lithium dendrites  

作　　者：David Fraile-Insagurbe Nicola Boaretto Itziar Aldalur Iñigo Raposo Francisco Javier Bonilla Michel Armand María Martínez-Ibañez 

机构地区：[1]Centre for Cooperative Research on Alternative Energies,CIC energiGUNE,Basque Research and Technology Alliance(BRTA),Alava Technology Park,Albert Einstein 48,Vitoria-Gasteiz 01510,Spain [2]University of the Basque Country(UPV/EHU),Barrio Sarriena,s/n,Leioa 48940,Spain

出　　处：《Nano Research》2023年第6期8457-8468,共12页纳米研究（英文版）

摘　　要：Solid-state polymer electrolytes are considered as an alternative to classic liquid electrolytes,particularly for application in highenergy lithium metal batteries.With respect to common dual-ion conductors,single-ion conducting polymer electrolytes(SICPEs)are less affected by lithium dendrites growth and thus are particularly interesting for application in lithium metal batteries.In this work,novel SIC-PEs are developed,based on an ionomer having poly(ethylene-alt-maleimide)backbone and lithium phenylsulfonyl(trifluoromethanesulfonyl)imide pendant moieties,further blended with poly(ethylene oxide)(PEO)and poly(ethylene glycol)dimethyl ether(PEGDME).These SIC-PEs exhibit ionic conductivity around~7×10^(−6)S·cm^(−1) at 70℃,lithium transference number close to unity,and excellent mechanical properties,with fracture toughness over 30 J·cm^(−3).Additionally,the electrolytes show very high resistance against lithium dendrites growth,by cycling for more than 1200 h in Li°symmetric cells at a current density of 0.1 mA·cm^(−2).LiFePO4||Li°cells with these SIC-PEs were cycled at 70℃ and C/10,showing initial capacity of almost 160 mAh·g^(−1)and residual capacity of 45%after 100 cycles.This work shows that single-ion conducting polymer electrolytes based on poly(ethylene-alt-maleimide)backbone are promising materials for application as electrolytes or catholytes in lithium metal polymer batteries.

关 键 词：single-ion conductors solid-state Li metal batteries polymer electrolytes lithium dendrites transference number mechanical properties 

分 类 号：O63[理学—高分子化学]