气压及孔隙率对锂-空气电池放电特性的影响

Establish a two-dimensional transient mathematical model of an organic electrolyte lithium-air battery, couple the charge conservation equation, the electrode reaction kinetics equation and the mass transfer equation, and study the influence of air pressure and the gradually changing porosity of the porous electrode on the battery discharge performance. Under the discharge condition with a current density of 0.1 mA/cm², the specific capacity of the battery increases with the increase of air pressure, and the distribution of the products inside the porous electrode is more uniform. When a gradually changing porosity is used for the porous electrode, oxygen can more easily enter the interior of the electrode, providing a larger space for the reaction to accommodate the deposit lithium peroxide. The specific capacity of the battery with a porous electrode of gradually changing porosity increases to 1580 mAh/g, while that of the battery with a conventional porosity is 720 mAh/g.

建立二维瞬态有机电解质锂-空气电池数学模型,对电荷守恒方程、电极反应动力学方程和传质方程进行耦合,研究气压及多孔电极渐变孔隙率对电池放电性能的影响。在电流密度为0. 1 mA/cm~2的放电条件下,电池比容量随着气压增大而增大,生成物在多孔电极内部的分布更均匀。多孔电极使用渐变孔隙率,氧气更容易进入电极内部,为反应提供较大的空间来容纳沉积物过氧化锂。渐变孔隙率多孔电极电池的比容量增加到1 580 mAh /g,常规孔隙率电池为720 mAh /g。