Experimental analysis of the performance impact of zero-volt operation on commercial sodium-ion cells

With sodium-ion batteries now becoming widely available from commercial manufacturers, and their deployment in a growing number of energy storage applications, it is becoming increasingly important that their performance be well understood. A key benefit of sodium-ion cells over their lithium-based counterparts it the ability to be discharged to zero volts without damage. This work presents the results of an experimental study to assess the performance impact of zero-volt operation on a commercial sodium-ion cell. The cell is subjected to a series of test procedures in which it is discharged to 0 V, and the resulting performance impact of these operations is measured in terms of capacity delivery and DC internal resistance. Post-testing analysis of the cell shows limited appreciable degradation in either of the examined metrics as a result of zero-volt operation.