Synthesis method of high-capacity high-nickel multi-element metal oxide cathode material

Abstract

The present invention discloses a synthesis method for a high-capacity and high-nickel multi-metal oxide cathode material, and the method comprises the steps of: (1) in the presence of water, an aqueous solution or a solvent, grinding lithium, cobalt, nickel, and a metal M compound; (2) spray-drying the above mixture; (3) high-temperature sintering the mixture to obtain LiNi[x]Co[y]M[z]O[2]; and (4) introducing a coating on the LiNi[x]Co[y]M[z]O[2] surface to obtain the cathode material. The coated LiNi[x]Co[y]M[z]O[2] material shows excellent electrochemical performance, for instance, under 0.1C and 3C, the discharge capacity of the LiNi[0.928]Co[0.069]Mg[0.003]O[2] material coated by LiCoO[2] can respectively be more than 200 and 165mAh / g (2.75-4.3V vs Li / Li <+>). The synthesis method of the present invention has the characteristics of being simple in the implementation of method, low in costs of processes and raw materials, and easy to realize industrialization.

Description

Technical field [0001] The invention relates to the field of secondary batteries, in particular to a method for synthesizing an active positive electrode material of a metal oxide lithium ion battery with high nickel content, and a corresponding electrode and battery. Background technique [0002] People have studied various cathode materials in the field of rechargeable batteries. LiCoO 2 With its high working voltage and long cycle life, it has become the most commonly used cathode material in commercial lithium-ion batteries. Although LiCoO 2 It is a cathode material widely used in portable rechargeable battery applications, but its cobalt resources are scarce, toxic, expensive, low actual specific capacity (between 140 and 150mAh / g) and relatively low thermal stability Sexual characteristics make LiCoO 2 The application is limited to small electronic product applications, such as mobile phones and digital rechargeable batteries. LiNiO 2 The theoretical capacity is 275mAh / g,...

AI Technical Summary

Problems solved by technology

Co-precipitation method can obtain precursors with smaller particle size and uniform mixing than high-temperature solid-phase method, and the synthesis temperature is low, and the product components after sintering are uniform; however, co-precipitation method involves more process steps, so it has relatively high production cost

However, the sol-gel method has a high production cost due to the use of organometallic reactant precursors, which is not conducive to industrial production.

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