二次电池枝晶内电荷平衡的凸化
Convexification of Charge Equilibrium within the Dendrites of Rechargeable Batteries
摘要：
电池电化学充电过程中微观结构的非晶化扩展是导致电池容量衰减和短路的主要原因。微结构上的电荷分布是局部和全局平衡的结果，是一个非凸问题，只是由于原子的随机放置。因此，获得电荷平衡（QEq）是一个关键因素，因为电荷量决定了接近微观结构的离子物质的键形成的成功率，并因此决定了电化学沉积物的最终形态。在这里，我们开发了一个计算负担得起的方法来确定这种微结构内的电荷分配。成本函数和电荷分布的跨度与平凡方法以及常规方法非常密切相关，尽管具有显著更少的计算成本。该方法可用于非凸环境中的优化，特别是随机性。
英文摘要：
The amorphous propagation of microstructures during the electrochemical charging of a battery is the main reason for the capacity decay and short circuit. The charge distribution across the micro-structure is the result of both local and global equilibrium and is non-convex problem merely due to stochastic placement of the atoms. As such, obtaining the charge equilibrium (QEq) is a critical factor, since the amount of charge determines the success rate of the bond formation for the ionic species approaching the microstructure and consequently the ultimate morphology of the electrochemical deposits. Herein we develop a computationally-affordable method for determining the charge allocation within such microstructures. The cost function and the span of the charge distribution correlates very closely with the trivial method as well as a conventional method, albeit having significantly less computational cost. The method can be used for optimization in non-convex environments, specially those of stochastic nature.
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