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Surface modification of LiNi0.8Co0.15Al0.05O2 particles via Li3PO4 coating to enable aqueous electrode processing

: Hofmann, Michael; Nagler, Felix; Kapuschinski, Martina; Guntow, Uwe; Giffin, Guinevere A.

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ChemSusChem. Chemistry & sustainability, energy & materials 13 (2020), Nr.22, S.5962-5971
ISSN: 1864-5631
ISSN: 1864-564X
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISC ()
aqueous electrode processing; lithium phosphate coating; lithium-ion battery; Ni-rich cathode material; sustainable chemistry

The successful implementation of an aqueous-based electrode manufacturing process for nickel-rich cathode active materials is challenging due to their high water sensitivity. In this work, the surface of LiNi0.8Co0.15Al0.05O2 (NCA) was modified with a lithium phosphate coating to investigate its ability to protect the active material during electrode production. The results illustrate that the coating amount is crucial and a compromise has to be made between protection during electrode processing and sufficient electronic conductivity through the particle surface. Cells with water-based electrodes containing NCA with an optimized amount of lithium phosphate had a slightly lower specific discharge capacity than cells with conventional N-methyl-2-pyrrolidone-based electrodes. Nonetheless, the cells with optimized water-based electrodes could compete in terms of cycle life.