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Abstract Ni-rich cathode materials always suffer from surface lithium residues mainly caused by the reduction of Ni3+ to Ni2+ when exposing to moisture, and severe side reactions between organic electrolyte… Click to show full abstract
Abstract Ni-rich cathode materials always suffer from surface lithium residues mainly caused by the reduction of Ni3+ to Ni2+ when exposing to moisture, and severe side reactions between organic electrolyte and highly active Ni4+ when fully charged. An appropriate amount of NH4H2PO4 is firstly coated on the hydroxide precursor Ni0.815Co0.15Al0.035(OH)2 before mixing with Li2CO3. The NH4H2PO4 can react with the lithium residues and form a uniform Li3PO4 coating layer. X-ray diffraction, scanning electron microscopy, field emission transmission electron microscopy and element mapping are employed to investigate the Li3PO4 coating layer. Electrochemical measurements results show that the cycle stability of the synthesized LiNi0.815Co0.15Al0.035O2 both at room temperature and 55 °C has been significantly improved. Its thermal stability has also been greatly enhanced.
Journal Title: Journal of Alloys and Compounds
Year Published: 2017
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