The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is pr...The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is proposed to enhance the battery interface stability.The strategy introduces methyl cellulose into acrylamide,which can effectively stabilize the electrode interface and reconstruct the hydrogen bond networks of the electrolyte through its unique thermos-gelation property.Methylcellulose is dissolved by heating and cooled to form gel.This thermal gelation strategy formed hydrogen bonds with a large amount of free water and methyl cellulose,which not only reduced the water activity but also enhanced the intermolecular polymerization network and also promoted the solvation of Zn2+.More importantly,the symmetric batteries with HE-HG hydrogel electrolyte exhibited a long cycling life of 8000 h.The Zn||Zn0.25V2O5(Zn||ZVO)battery displays the low-capacity decay rate for 800 cycles at 1 C at−20°C.The pouch battery maintains a capacity of 255 mAh·g^(−1) after 100 cycles under 2.5 A·g−1 at−20°C.This study provides a new way to enhance the interfacial stability,which helps to realize the scale application of flexible zinc-ion batteries.展开更多
The liquid-cooled battery energy sto rage system(LCBESS) has gained significant attention due to its superior thermal management capacity.However,liquid-cooled battery pack(LCBP) usually has a high sealing level above...The liquid-cooled battery energy sto rage system(LCBESS) has gained significant attention due to its superior thermal management capacity.However,liquid-cooled battery pack(LCBP) usually has a high sealing level above IP65,which can trap flammable and explosive gases from battery thermal runaway and cause explosions.This poses serious safety risks and challenges for LCBESS.In this study,we tested overcharged battery inside a commercial LCBP and found that the conventionally mechanical pressure relief valve(PRV) on the LCBP had a delayed response and low-pressure relief efficiency.A realistic 20-foot model of an energy storage cabin was constructed using the Flacs finite element simulation software.Comparative studies were conducted to evaluate the pressure relief efficiency and the influence on neighboring battery packs in case of internal explosions,considering different sizes and installation positions of the PRV.Here,a newly developed electric-controlled PRV integrated with battery fault detection is introduced,capable of starting within 50 ms of the battery safety valve opening.Furthermore,the PRV was integrated with the battery management system and changed the battery charging and discharging strategy after the PRV was opened.Experimental tests confirmed the efficacy of this method in preventing explosions.This paper addresses the safety concerns associated with LCBPs and proposes an effective solution for explosion relief.展开更多
Energy-storage technologies based on lithium-ion batteries are advancing rapidly.However,the occurrence of thermal runaway in batteries under extreme operating conditions poses serious safety concerns and potentially ...Energy-storage technologies based on lithium-ion batteries are advancing rapidly.However,the occurrence of thermal runaway in batteries under extreme operating conditions poses serious safety concerns and potentially leads to severe accidents.To address the detection and early warning of battery thermal runaway faults,this study conducted a comprehensive review of recent advances in lithium battery fault monitoring and early warning in energy-storage systems from various physical perspectives.The focus was electrical,thermal,acoustic,and mechanical aspects,which provide effective insights for energy-storage system safety enhancement.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52322708 and 52441702)Zhengzhou University Young Student Basic Research Projects(PhD students)(No.ZDBJ202512).
文摘The interface problems in zinc-ion batteries severely limit their electrochemical performance,even in hydrogel(HG)electrolyte(HE).Herein,a strategy of reconfiguring the hydrogen bond networks by thermal gelation is proposed to enhance the battery interface stability.The strategy introduces methyl cellulose into acrylamide,which can effectively stabilize the electrode interface and reconstruct the hydrogen bond networks of the electrolyte through its unique thermos-gelation property.Methylcellulose is dissolved by heating and cooled to form gel.This thermal gelation strategy formed hydrogen bonds with a large amount of free water and methyl cellulose,which not only reduced the water activity but also enhanced the intermolecular polymerization network and also promoted the solvation of Zn2+.More importantly,the symmetric batteries with HE-HG hydrogel electrolyte exhibited a long cycling life of 8000 h.The Zn||Zn0.25V2O5(Zn||ZVO)battery displays the low-capacity decay rate for 800 cycles at 1 C at−20°C.The pouch battery maintains a capacity of 255 mAh·g^(−1) after 100 cycles under 2.5 A·g−1 at−20°C.This study provides a new way to enhance the interfacial stability,which helps to realize the scale application of flexible zinc-ion batteries.
基金sponsored by the Science and Technology Program of State Grid Corporation of China(4000-202355090A-1-1ZN)。
文摘The liquid-cooled battery energy sto rage system(LCBESS) has gained significant attention due to its superior thermal management capacity.However,liquid-cooled battery pack(LCBP) usually has a high sealing level above IP65,which can trap flammable and explosive gases from battery thermal runaway and cause explosions.This poses serious safety risks and challenges for LCBESS.In this study,we tested overcharged battery inside a commercial LCBP and found that the conventionally mechanical pressure relief valve(PRV) on the LCBP had a delayed response and low-pressure relief efficiency.A realistic 20-foot model of an energy storage cabin was constructed using the Flacs finite element simulation software.Comparative studies were conducted to evaluate the pressure relief efficiency and the influence on neighboring battery packs in case of internal explosions,considering different sizes and installation positions of the PRV.Here,a newly developed electric-controlled PRV integrated with battery fault detection is introduced,capable of starting within 50 ms of the battery safety valve opening.Furthermore,the PRV was integrated with the battery management system and changed the battery charging and discharging strategy after the PRV was opened.Experimental tests confirmed the efficacy of this method in preventing explosions.This paper addresses the safety concerns associated with LCBPs and proposes an effective solution for explosion relief.
文摘Energy-storage technologies based on lithium-ion batteries are advancing rapidly.However,the occurrence of thermal runaway in batteries under extreme operating conditions poses serious safety concerns and potentially leads to severe accidents.To address the detection and early warning of battery thermal runaway faults,this study conducted a comprehensive review of recent advances in lithium battery fault monitoring and early warning in energy-storage systems from various physical perspectives.The focus was electrical,thermal,acoustic,and mechanical aspects,which provide effective insights for energy-storage system safety enhancement.
