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Lithium ion cells don’t need cobalt

2020-07-17 Editor:Super administratorSource:Original


UTA-li-ion-cathode-poweders-including-cobalt-free-600.jpg


The cathode is made from 89% nickel, then manganese and aluminium, part of a group of alloys dubbed NMAs.They were compared with high-nickel (both also 89%) cobalt-inclusive alloys from groups called nickel-manganese-cobalt (NMC) and nickel-cobalt-aluminium (NCA), described as “the cathode materials of choice for next‐generation high‐energy lithium‐ion batteries”, by the Austin researchers in their Advanced Materials paper ‘High‐nickel NMA: a cobalt‐free alternative to NMC and NCA cathodes for lithium‐ion batteries’.


All three alloys were made at the university, plus a fourth: Al-Mg-doped NMC (NMCAM).Slightly lower specific capacity was identified, but ~40mV higher operating voltage and similar rate capability to NMC and NCA.In test cells with graphite anodes, the NMA beat NMC and NCA after 1,000 deep cycles (but not NMCAM, nor a commercial cathode).“Eliminating cobalt usually slows down the kinetic response of a battery and leads to lower rate capability,” according to the university. “However, the researchers said they’ve overcome the poor rate capability, and short cycle life, through finding an optimal combination of metals and ensuring an even distribution of their ions.”‘High‐nickel NMA: a cobalt‐free alternative to NMC and NCA cathodes for lithium‐ion batteries’ can be found here in Advanced Materials.The photo shows various University of Texas in Austin lithium-ion cathode powders ready for trials.


    Source: This news is taken from www.electronicsweekly.com

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