Al2O3负极涂层对锂离子电池性能的影响OA

Lithium-ion batteries have become the most widely used storage batteries in aerospace,aviation,and equipment applications,owing to their high energy density,long cycle life,and no memory effect performance.At present,safety is a hot research spot of lithium-ion batteries,and the main research content includes material,interface stability,electrolyte,and battery structure design.The interface stability of the electrodes of lithium-ion batteries is an important factor affecting their safety performance.Many researchers have reported that the electrochemical stability and safety performance of electrodes could be improved by being coated or modified with inactive materials.In this paper,an inert Al2O3 nano-coating is used to modify the surface of a lithium-ion battery cathode,and the effects of the modification on the electrical performance,thermal performance,and safety performance of the battery thermal runaway safety performance are investigated.The results show that the introduction of Al2O3 could reduce the reaction heat rate from 175 mW/g to 110 mW/g,reduce the battery's thermal runaway temperature from 316℃to 280℃,and decrease the peak temperature rise rate from 1 400℃/min to 16℃/min.The Al2O3-nano-coating can effectively improve the thermal stability of cathodes,and reduce the battery's runaway temperature and heat rise rate simultaneously,greatly enhancing the battery's safety.