CAJ | 학술논문

研究了锂离子电池在常温和高温60℃时电池的循环性能和容量衰减原因.采用恒流-恒压(CC-CV)充放电制度对锂离子电池在不同温度下进行了300次的充放电循环测试,运用扫描电子显微镜法(SEM)和X射线衍射光谱法(XRD)测试手段对不同温度下循环300次后的锂离子电池电极材料的形貌和结构进行了表征,并运用充放电测试和交流阻抗技术对电池电化学性能进行了研究.结果表明,升高温度后锂离子电池表现出较高的初始容量,但电池的循环稳定性降低,容量衰减速率加快.充电过程中电极极化加剧是导致高温下电池容量迅速衰减的主要原因,而在高温条件下电荷传输电阻增加和由于大量气体的产生使电极发生形变,使放电容量进一步衰减.
연구료리리자전지재상온화고온60℃시전지적순배성능화용량쇠감원인.채용항류-항압(CC-CV)충방전제도대리리자전지재불동온도하진행료300차적충방전순배측시,운용소묘전자현미경법(SEM)화X사선연사광보법(XRD)측시수단대불동온도하순배300차후적리리자전지전겁재료적형모화결구진행료표정,병운용충방전측시화교류조항기술대전지전화학성능진행료연구.결과표명,승고온도후리리자전지표현출교고적초시용량,단전지적순배은정성강저,용량쇠감속솔가쾌.충전과정중전겁겁화가극시도치고온하전지용량신속쇠감적주요원인,이재고온조건하전하전수전조증가화유우대량기체적산생사전겁발생형변,사방전용량진일보쇠감.
The cycle performance and capacity fading of lithium-ion secondary batteries cycled both at RT and 60 ℃ were studied.The charge-discharge cycle of lithium-ion batteries was tested for 300 cycles at different temperatures by conventional constant current-constant voltage (CC-CV) protocol.The characteristics of morphology and structure after cycle were investigated by SEM and XRD,and the electrochemistry properties were studied by charge/discharge cycle and EIS.The results show that the initial capacity increases,but cycle stability of lithium-ion batteries decreases and capacity fading accelerates at elevated temperatures.Capacity fading of lithium-ion battedes at elevated temperature can be attdbuted pdmadly to the increase of electrochemistry polarization of cathode materials and the deterioration of the morphology and structure,and it gets even worse due to the structure change of active materials resulting from a mass of gas produced at elevated temperatures.