Preparation method of spherical high-voltage lithium nickel manganate anode material

Abstract

The invention discloses a preparation method of a spherical high-voltage lithium nickel manganate anode material represented by the formula of [Li (Ni0.5-XMn1.5MX) FyO4-Y] 1-Z.[NO]Z. The preparation method comprises the following steps of: evenly mixing a nickel salt solution and a manganese salt solution, and then adding a mixed metal salt solution, a complexing agent solution and a precipitator solution into a reaction kettle with a base solution and a protective gas for coprecipitation reaction; carrying out solid-liquid separation on an overflowing material after the complete reaction; aging the separated solid material; carrying out solid-liquid separation on the aged solid material, thereby obtaining a spherical nickel-manganese binary precursor; evenly mixing a lithium source, the nickel-manganese binary precursor and an M source compound, sintering twice under an oxygen enrichment atmosphere condition, and annealing, thereby obtaining spherical high-voltage lithium nickel manganate. The spherical material prepared by the invention has the advantages of high voltage, high compaction, high volume, excellent rate capability and high-temperature circulating performance, low material cost and the like.

Description

technical field [0001] The invention relates to a lithium battery cathode material and a preparation method thereof, in particular to a preparation method of a spherical high-voltage cathode material for a lithium ion battery. Background technique [0002] Lithium-ion secondary batteries have higher energy density than other rechargeable battery systems, and their applications range from various portable electronic devices to large zero-emission electric vehicles. As a cathode material for lithium-ion batteries, it must meet the following requirements: (1) high energy density; (2) small voltage change during discharge, that is, it should have a stable discharge platform; (3) high power density; (4) excellent cycle performance; (5) environmental friendly; (6) cheap. Because energy density is a comprehensive reflection of voltage and capacity, battery cathode materials with both high voltage and large capacity are particularly important. [0003] Currently used cathode mater...

AI Technical Summary

Problems solved by technology

[0004] The synthetic molecular formula is [Li(Ni 0.5-X mn 1.5 m X ) F y o 4-y ] 1-Z ·[NO] Z The methods of spherical high-voltage lithium nickel manganese oxide cathode materials mainly include: co-precipitation method, solid-phase method, composite carbonate method, sol-gel method, molten salt method, emulsion drying method, ultrasonic spray pyrolysis method, solid-phase The process is simple and the cost is low, but the electrochemical stability is poor, the particle distribution is uneven, the shape is irregular, and there are impurities

Co-precipitation process is relatively simple, the shape of the material is good, the particles are spherical, the material capacity is high, the rate and cycle performance are good, and the vibration and compaction are high. It is the current synthetic high-voltage cathode material lithium nickel manganate [Li(Ni 0.5-X mn 1.5 m X )F y o 4-y ] 1-Z ·[NO] Z The most promising method, but there is a defect that the product phase may be impure due to incomplete mixing during the high-temperature calcination process after the homogeneous precursor is mixed with the lithium salt

Other process methods either have a series of problems such as complex process, high equipment investment and high cost

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