Cathode

Development in NM(C)A cathodes is heading toward increased Ni content. However, LiNiO2 undergoes detrimental phase transitions that lead to particle cracking and capacity fade. Dopants can suppress these phase transitions and stabilize long-term cycling. Two research teams recently developed orthogonal doping strategies. Zhang et al. created a high-entropy Co-free layered cathode with Ni, Mn, Ti, Mg, Nb, and Mo mixed on the transition metal site. Wang et al. added a single element, lanthanum, which did not actually dope into the NMC811 structure but rather formed perovskite-like La4Li[Ni,Mn,Co]O8 as an intergrown secondary phase. Both strategies minimized volume change during cycling and extended the cycle life.

Elemental doping and secondary phases can stabilize Ni-rich cathodes for applications requiring high energy and long cycle life

Research: Cathode Source: Zhang, Wang, Zou, Lin, et al.; Wang, Liu, Wu, and Lu

Volta Foundation

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