)电池具有极高的比能量容量,使其在大规模使用中极具潜力。但是,其功率遭到碳基电极上过氧化锂(Li2)堆积的制约,这种堆积会阻塞孔隙并导致电极钝化,然后下降放电容量。Li2产品(无论是晶体状还是薄膜状)的形貌会明显影响电池功能,尤其是放电速率和循环稳定性。了解和预测这些结构关于优化电池运转、减少对贵重添加剂(例如或许损害锂阳极的氧化复原介体)的依靠至关重要。本研讨选用集体平衡模型和统计评价办法对锂2电池放电进程中的结晶行为,研讨确认反响物浓度和电池容量是影响该进程的要害因素。研讨结果表明这些变量的相互作用也会影响终究锂2浓度。经过聚集环形形貌特征,本研讨为集体建模办法在了解锂2产品构成进程中的强壮剖析能力供给了重要见地。2电池放电形式。因而,这些研讨成果经过供给操控结晶和提高整体电池功能的战略,有助于推进储能技能的前进。2 crystallization during battery discharge, identifying reactant concentration and battery capacity as key factors influencing the process. The findings reveal that the interaction of these variables also impacts the final Li2O2 concentration. By focusing on the toroid morphology, the study provides valuable insights into how the application of population modeling can be a powerful tool in understanding the formation of the Li2O2 product during Li
O2 battery discharge mode. Therefore, these results contribute to advancing energy storage technologies by offering strategies to control crystallization and enhance the overall battery performance.
电池因其高存储容量[2,4]成为大规模使用中有潜力的替代选择。锂2电池的理论功能可达3500 Wh/kg,是现在比能量容量最高的电化学器材[5,6],远超锂离子电池(387 Wh/kg)、锌空气电池(1086 Wh/kg)和锂硫电池(2567 Wh/kg)技能[1]。此外,锂
电池具有供给高能量功率和可重复充电的潜力[4]。2 battery is in the range of 3500 W.h/kg, being the electrochemical device with the greatest specific energy capacity [5,6], surpassing that of lithium-ion (387 Wh/kg), zinc-air (1086 W.h/kg), and lithium‑sulfur (2567 Wh/kg) technologies[1]. Moreover, the Li
O2 battery has the potential to provide high energy efficiency and rechargeability [4].
电池单元由金属锂阳极、隔膜以及填充含锂盐有机电解液的多孔电极组成,该电解液溶解于非质子溶剂中[7]。图1展现了本课题组选用的锂2电池示意图。该多孔电极选用导电材料制备,因其需为O
与Li2之间的反响供给电子。不同于依靠插层化学完成循环的传统锂离子电池,锂2细胞根据过氧化锂(Li+) 在放电进程中构成并在充电进程中分解[8]。
O2 cells are based on reaction processes in which lithium peroxide (Li2O2) is formed during discharge and decomposed during charge [8].
2
222+2Li→Li++
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