The advancement of lithium-ion batteries(LIBs)towards larger structures is considered the most efficient approach to enhance energy density in clean energy storage systems.However,this advancement poses significant ch...The advancement of lithium-ion batteries(LIBs)towards larger structures is considered the most efficient approach to enhance energy density in clean energy storage systems.However,this advancement poses significant challenges in terms of the filling and wetting processes of battery electrolytes.The intricate interplay between electrode microstructure and electrolyte wetting process still requires further investigation.This study aims to systematically investigate the primary mechanisms influencing electrolyte wetting on porous electrode structures produced through different manufacturing processes.Using advanced X-ray computed tomography,threedimensional electrode structures are reconstructed,and permeability and capillary action are evaluated as key parameters.It is observed that increasing calendering pressure and active material content reduces electrode porosity,thereby decreasing permeability and penetration rate;however,it simultaneously enhances capillary action.The interplay between these indicators contributes to the complexity of wetting behavior.Incomplete wetting of electrolytes arises from two primary factors elucidated by further simulations:partial closure of pores induced by the calendering process impedes complete wetting,while non-wetting phase gases become trapped within the electrolyte during the wetting process hindering their release and inhibiting full penetration of the electrolyte.These findings have significant implications for designing and optimizing LIBs while offering profound insights for future advancements in battery technology.展开更多
Lithium-ion batteries are currently the most widely used energy storage devices due to their superior energy density,long lifespan,and high efficiency.However,the manufacturing defects,caused by production flaws and r...Lithium-ion batteries are currently the most widely used energy storage devices due to their superior energy density,long lifespan,and high efficiency.However,the manufacturing defects,caused by production flaws and raw material impurities can accelerate battery degradation.In extreme cases,these defects may result in severe safety incidents,such as thermal runaway.Metal foreign matter is one of the main types of manufacturing defects,frequently causing internal short circuits in lithium-ion batteries.Among these,copper particles are the most common contaminants.This paper addresses the safety risks posed by manufacturing defects in lithium-ion batteries,analyzes their classification and associated hazards,and reviews the research on metal foreign matter defects,with a focus on copper particle contamination.Furthermore,we summarize the detection methods to identify defective batteries and propose future research directions to address metal foreign matter defects.展开更多
基金supported by the National Natural Science Founda-tion of China(NSFC)under grant numbers 52277222 and 52277223the Shanghai Science and Technology Development Fund under grant number 22ZR14445000.
文摘The advancement of lithium-ion batteries(LIBs)towards larger structures is considered the most efficient approach to enhance energy density in clean energy storage systems.However,this advancement poses significant challenges in terms of the filling and wetting processes of battery electrolytes.The intricate interplay between electrode microstructure and electrolyte wetting process still requires further investigation.This study aims to systematically investigate the primary mechanisms influencing electrolyte wetting on porous electrode structures produced through different manufacturing processes.Using advanced X-ray computed tomography,threedimensional electrode structures are reconstructed,and permeability and capillary action are evaluated as key parameters.It is observed that increasing calendering pressure and active material content reduces electrode porosity,thereby decreasing permeability and penetration rate;however,it simultaneously enhances capillary action.The interplay between these indicators contributes to the complexity of wetting behavior.Incomplete wetting of electrolytes arises from two primary factors elucidated by further simulations:partial closure of pores induced by the calendering process impedes complete wetting,while non-wetting phase gases become trapped within the electrolyte during the wetting process hindering their release and inhibiting full penetration of the electrolyte.These findings have significant implications for designing and optimizing LIBs while offering profound insights for future advancements in battery technology.
基金supported by the National Key R&D Program of China(2021YFB2402002)Beijing Natural Science Foundation(Grant No.L223013).
文摘Lithium-ion batteries are currently the most widely used energy storage devices due to their superior energy density,long lifespan,and high efficiency.However,the manufacturing defects,caused by production flaws and raw material impurities can accelerate battery degradation.In extreme cases,these defects may result in severe safety incidents,such as thermal runaway.Metal foreign matter is one of the main types of manufacturing defects,frequently causing internal short circuits in lithium-ion batteries.Among these,copper particles are the most common contaminants.This paper addresses the safety risks posed by manufacturing defects in lithium-ion batteries,analyzes their classification and associated hazards,and reviews the research on metal foreign matter defects,with a focus on copper particle contamination.Furthermore,we summarize the detection methods to identify defective batteries and propose future research directions to address metal foreign matter defects.
