In order to get a super comprehensive performance, electrodes in high energy density batteries always consist of particles with different features. Thus, a deep insight into the interaction between particles can help to further improve the electrode performance. In this paper, an extended pseudo-2-dimension (P2D) model based on a 60 Ah high-energy-density (HED) Li-ion pouch cell (≥280Wh kg⁻¹) with Si-based anode/Ni-rich cathode couple is established and the internal micro characteristics within electrodes are investigated. A competitive relationship in the direction between particle radial and electrode thickness is observed, and therefore electrodes composed of more large particles have a higher utilization at aluminum (Al) foil current collector. There is a big difference in the average state-of-charge (SOC) between the two particles. Fortunately, the huge difference between particles can be balanced out during the constant voltage process or rest period. According to the model, electrodes with big particles besides the separator and small particles besides the current collector may exhibit the best overall performance and an appropriate kinetic matching between cathode and anode is more beneficial to high-rate charging, rather than a superior positive electrode alone, taking the lithium plating risk into account.

为了获得超强的综合性能，高能量密度电池中的电极总是由具有不同特性的粒子组成。因此，深入了解粒子之间的相互作用有助于进一步提高电极性能。^{在本文中，基于 60 Ah 高能量密度 (HED) 锂离子软包电池 (≥280Wh kg -1} ) 的扩展伪二维 (P2D) 模型) 建立了硅基阳极/富镍阴极对，并研究了电极内部的微观特性。观察到颗粒径向和电极厚度在方向上的竞争关系，因此由更大颗粒组成的电极在铝（Al）箔集流体中具有更高的利用率。两个粒子之间的平均充电状态 (SOC) 存在很大差异。幸运的是，粒子之间的巨大差异可以在恒压过程或休息期间得到平衡。根据模型，除了隔膜之外的大颗粒和集流体之外的小颗粒电极可能表现出最佳的整体性能，并且正极和负极之间适当的动力学匹配更有利于高倍率充电，