钠电池充电过程发生了什么变化？

What changes occur during the charging process of Sodium-ion Battery?    

钠电池充电是电能转化为化学能的储能过程，内部会发生有序的离子迁移与结构变化。当外接充电器接入电池形成电压差后，在电场驱动力作用下，正极材料晶格中的钠离子被激活、脱嵌脱离正极本体，溶解扩散至 surrounding电解液中；随后钠离子顺着电场方向，穿过隔膜的微孔通道，持续向负极迁移；最终大量钠离子均匀嵌入负极硬碳材料的多级微孔结构中，稳定储存于负极内部。整个过程中，外部电能持续输入，转化为钠离子的化学势能储存在电池内部，电池电压逐步上升，电量持续增加，完成充电储能全过程，全程无不可逆结构损坏。

The charging of Sodium-ion Battery is an energy storage process in which electrical energy is converted into chemical energy, and internal ordered ion migration and structural changes occur. When the external charger is connected to the battery to form a voltage difference, under the driving force of the electric field, the sodium ions in the cathode material lattice are activated, deintercalated and separated from the cathode body, dissolved and diffused into the surrounding electrolyte; then the sodium ions migrate along the electric field direction, pass through the micropore channels of the separator, and continue to migrate to the anode; finally, a large number of sodium ions are evenly intercalated into the multi-level micropore structure of the anode hard carbon material, and stably stored inside the anode. During the whole process, the external electrical energy is continuously input, converted into the chemical potential energy of sodium ions and stored in the battery, the battery voltage gradually rises, and the power continues to increase, completing the whole charging and energy storage process without irreversible structural damage.