Fast & Extreme Fast Charging

Magnetic Fields Enhance Diffusion Kinetics And Extend Lifetime Chen et al. report that magnetic fields can improve electrode kinetics, ionic transport, and lifetime of lithium-ion and sodium-ion cells. Adding a NdFeB magnetic spacer within coin cells led to significantly more uniform formation cycles for NMC 622/Cu, as demonstrated by the voltage vs. time evolution in formation cycles in Figure 1 for the control group (a) and the magnetic group (b). The magnetic group also shows dramatically improved capacity in the 1st (c) and 2nd (d) cycles.

Furthermore, when cycling the NMC 622 Graphite cell over a longer period of time Figure 2, there is a clear improvement in capacity retention and coulombic efficiency when a magnet is applied to the cells. Cycling performance with/without the magnetic field for NMC622//graphite: discharge capacity (a) and Coulombic efficiency (b) of the two groups at a current density of 0.5 mA cm2, and discharge capacity (c) and Coulombic efficiency (d) of the two groups at a current density of 2 mA cm2.

Figure 1

Figure 2

Source: Chen et al, Journal of Power Sources Volume 602, May 2024, DOI:https://doi.org/10.1016/j.jpowsour.2024.234323

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