Study On The Preparation Of Lithium Ion Battery Cathode Material LiNi_0.8Co_0.15Al_0.05O₂ Precursor

With the rapid development of the new energy automotive industry in recent years,the market's demand for high-performance power batteries has also increased.However,large-scale commercial production of lithium-ion batteries have many drawbacks,such as lithium cobalt oxide batteries are expensive,lithium nickel-lithium batteries are difficult to prepare and so on.Lithium-ion batteries using LiNi_0.8Co_0.15Al_0.05O₂ as a positive electrode material have advantages of high capacity,good stability,and low price,and have a strong application potential.However,the LiNi_0.8Co_0.15Al_0.05O₂ prepared by the existing method has the problems of serious cation mixing,difficult particle size control,and serious pollution.In view of the above problems,the production process of LiNi_0.8Co_0.15Al_0.05O₂ precursors has been improved.In this paper,the safe and pollution-free ammonia triacetic acid is used as a complexing agent instead of ammonia,and a co-precipitation method is used to prepare lithium nickel-ion battery cathode material LiNi_0.8Co_0.15Al_0.05O₂ precursor.The lithium LiNi_0.8Co_0.15Al_0.05O₂ precursor prepared by this method has uniform metal element distribution,good morphology and controllable particle size.By discussing the effect of the addition amount of complexing agent,reaction time,aging process and the aluminum source on the crystal structure,morphology and particle size of the lithium LiNi_0.8Co_0.15Al_0.05O₂ precursor,the optimal conditions for preparation were determined.For the problem of low crystallinity of the precursor material prepared by the co-precipitation method,a co-precipitation-hydrothermal two-step method was used to increase the crystallinity of the precursor product.In this paper,precursors prepared by the co-precipitation method are used as raw materials to hydrothermally treat the precursors.The LiNi_0.8Co_0.15Al_0.05O₂ precursor prepared by the two-step method has a good?-Ni?OH?2 type structure and maintains the particle morphology and particle size of the coprecipitated product.The use of this method to prepare LiNi_0.8Co_0.15Al_0.05O₂ precursors has the advantages of low degree of cation mixing and strong layered properties.By discussing the influence of additives on the precursor products during the hydrothermal process,the optimum preparation conditions were determined.In view of the strong development momentum of aluminum-air batteries as a new energy vehicle power battery,this paper also studied the effect of metal element Yb on the performance of anode materials for aluminum-air batteries.