Ionic liquid electrolytes for sodium-ion batteries to control thermal runaway  

作　　者：Keith Sirengo Aswathy Babu Barry Brennan Suresh C.Pillai 

机构地区：[1]Nanotechnology and Bio-Engineering Research Group,Department of Environmental Science,Atlantic Technological University,ATU Sligo,Ash Lane,Sligo F91 YW50,Ireland [2]Health and Biomedical(HEAL)Strategic Research Centre,Atlantic Technological University,ATU Sligo,Ash Lane,Sligo F91 YW50,Ireland

出　　处：《Journal of Energy Chemistry》2023年第6期321-338,I0008,共19页能源化学（英文版）

基　　金：funded by CUA bursary,Ireland a project titled:Fabrication of solid-state electrolytes for batteries in smartphones and electric vehicles (EVs)。

摘　　要：Sodium-ion batteries are expected to be more affordable for stationary applications than lithium-ion batteries,while still offering sufficient energy density and operational capacity to power a significant segment of the battery market.Despite this,thermal runaway explosions associated with organic electrolytes have led to concerns regarding the safety of sodium-ion batteries.Among electrolytes,ionic liquids are promising because they have negligible vapor pressure and show high thermal and electrochemical stability.This review discusses the safety contributions of these electrolyte properties for high-temperature applications.The ionic liquids provide thermal stability while at the same time promoting high-voltage window battery operations.Moreover,apart from cycle stability,there is an additional safety feature attributed to modified ultra-concentrated ionic liquid electrolytes.Concerning these contributions,the following have been discussed,heat sources and thermal runaway mechanisms,thermal stability,the electrochemical decomposition mechanism of stable cations,and the ionic transport mechanism of ultra-concentrated ionic liquid electrolytes.In addition,the contributions of hybrid electrolyte systems consisting of ionic liquids with either organic carbonate or polymers are also discussed.The thermal stability of ionic liquids is found to be the main contributor to cell safety and cycle stability.For high-temperature applications where electrolyte safety,capacity,and cycle stability are important,highly concentrated ionic liquid electrolyte systems are potential solutions for sodium-ion battery applications.

关 键 词：Thermal stability Ionic liquids Sodium-ion batteries Cycle stability Ionic conductivity 

分 类 号：TM912[电气工程—电力电子与电力传动] O645.1[理学—物理化学]