Preparation and Performance of Cobalt-Free Nickel-Rich Cathode Materials Through Flame-Assisted Spray Pyrolysis
Nickel-rich ternary cathode materials for lithium-ion batteries have received extensive attention due to their advantages of low cost and high capacity.Limited by the high toxicity and low reserves of cobalt,cobalt-free nickel-rich cathode materials are becoming the future development trend of lithium-ion batteries.The traditional liquid phase method for the preparation of cobalt-free nickel-rich materials has problems such as cumbersome steps,time-consuming,and many by-products.Flame-assisted spray pyrolysis(FASP)method can synthesize cathode materials in one step,which has the advantages of simple equipment,short time and environmental friendliness.In this study,LiNi0.8Mn0.2O2(NM82)cobalt-free nickel-rich cathode material was prepared by the FASP method,and the effects of synthesis conditions on the structure,morphology and electrochemical properties of NM82 were investigated.The results show that FASP can synthesize NM82 cathode material in one step.Under the conditions of carrier gas flow rate of 1.5 L/min,lithium excess of 10%and annealing temperature of 800 ℃,NM82 has the lowest lithium-nickel mixing level and the highest discharge specific capacity,reaching 180.2 mA∙h/g at 0.1 C rate.
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