The application of cyclohexyl benzene(CHB)as the overcharge protection additive in lithium ion batteries was analyzed.Through 1C overcharge testing,battery performance testing, electrochemical impedance testing,electr...The application of cyclohexyl benzene(CHB)as the overcharge protection additive in lithium ion batteries was analyzed.Through 1C overcharge testing,battery performance testing, electrochemical impedance testing,electrolyte conductivity and self-discharge testing,the use of cyclohexyl benzene as the overcharge protection additive and the effect of cyclohexyl benzene on battery performance were investigated.The possible mechanism of cyclohexyl benzene as the overcharge protection addtive was discussed.When the content of cyclohexyl benzene was more than 5%(mass),the battery could be protected from explosion.When the content of the cyclohexyl benzene exceeded 7%(mass),a detrimental effect on battery performance was found.Cyclohexyl benzene could also decrease electrolyte conductivity,leading to increased self-discharge.The proper content of cyclohexyl benzene was between 5%(mass) and 7%(mass).展开更多
Safety issue is still a problem nowadays for the large-scale application of lithium-ion batteries(LIBs)in electric vehicles and energy storage stations.The unsafe behaviors of LIBs arise from the thermal run-away,whic...Safety issue is still a problem nowadays for the large-scale application of lithium-ion batteries(LIBs)in electric vehicles and energy storage stations.The unsafe behaviors of LIBs arise from the thermal run-away,which is intrinsically triggered by the overcharging and overheating.To improve the safety of LIBs,various protection strategies based on self-actuating reaction control mechanisms(SRCMs)have been proposed,including redox shuttle,polymerizable monomer additive,potential-sensitive separator,thermal shutdown separator,positive-temperature-coefficient electrode,thermally polymerizable addi-tive,and reversible thermal phase transition electrolyte.As build-in protection mechanisms,these meth-ods can sensitively detect either the temperature change inside battery or the potential change of the electrode,and spontaneously shut down the electrode reaction at risky conditions,thus preventing the battery from going into thermal runaway.Given their advantages in enhancing the intrinsic safety of LIBs,this paper overviews the research progresses of SRCMs after a brief introduction of thermal runaway mechanism and limitations of conventional thermal runaway mitigating measures.More importantly,the current states and issues,key challenges,and future developing trends of SRCTs are also discussed and outlined from the viewpoint of practical application,aiming at providing insights and guidance for developing more effective SRCMs for LIBs.展开更多
文摘The application of cyclohexyl benzene(CHB)as the overcharge protection additive in lithium ion batteries was analyzed.Through 1C overcharge testing,battery performance testing, electrochemical impedance testing,electrolyte conductivity and self-discharge testing,the use of cyclohexyl benzene as the overcharge protection additive and the effect of cyclohexyl benzene on battery performance were investigated.The possible mechanism of cyclohexyl benzene as the overcharge protection addtive was discussed.When the content of cyclohexyl benzene was more than 5%(mass),the battery could be protected from explosion.When the content of the cyclohexyl benzene exceeded 7%(mass),a detrimental effect on battery performance was found.Cyclohexyl benzene could also decrease electrolyte conductivity,leading to increased self-discharge.The proper content of cyclohexyl benzene was between 5%(mass) and 7%(mass).
基金financially supported by the National Natural Science Foundation of China(U22A20438)the National Key R&D Program of China(2022YFB2502100)the National Natural Science Foundation of China(22309138).
文摘Safety issue is still a problem nowadays for the large-scale application of lithium-ion batteries(LIBs)in electric vehicles and energy storage stations.The unsafe behaviors of LIBs arise from the thermal run-away,which is intrinsically triggered by the overcharging and overheating.To improve the safety of LIBs,various protection strategies based on self-actuating reaction control mechanisms(SRCMs)have been proposed,including redox shuttle,polymerizable monomer additive,potential-sensitive separator,thermal shutdown separator,positive-temperature-coefficient electrode,thermally polymerizable addi-tive,and reversible thermal phase transition electrolyte.As build-in protection mechanisms,these meth-ods can sensitively detect either the temperature change inside battery or the potential change of the electrode,and spontaneously shut down the electrode reaction at risky conditions,thus preventing the battery from going into thermal runaway.Given their advantages in enhancing the intrinsic safety of LIBs,this paper overviews the research progresses of SRCMs after a brief introduction of thermal runaway mechanism and limitations of conventional thermal runaway mitigating measures.More importantly,the current states and issues,key challenges,and future developing trends of SRCTs are also discussed and outlined from the viewpoint of practical application,aiming at providing insights and guidance for developing more effective SRCMs for LIBs.