Method for synthesizing cathode material LiNi0.5Mn1.5O4 for 5V lithium ion batteries

Abstract

The invention discloses a method for synthesizing cathode material LiNi0.5Mn1.5O4 for 5V lithium ion batteries. Manganese salt, nickel salt and lithium compound are used as main material, oxalic acid is used as precipitator, and aqueous ammonia is used as complexing agent; the manganese salt and the nickel salt are proportionally mixed and then dissolved in water, so that manganese salt-nickel salt mixture is produced, and a moderate amount of oxalic acid is dissolved in water, so that oxalic acid solution is produced; the manganese salt-nickel salt mixture is first blended and reacts with the aqueous ammonia to form manganese and nickel ammonia complex ions, and then is blended and reacts with the oxalic acid solution to form manganese oxalate containing nickel; the manganese oxalate containing nickel and the mother solution are directly dried, so that manganese oxalate powder containing nickel is obtained, and the manganese oxalate powder containing nickel is then roasted under the temperature of 400 DEG C to 650 DEG C for three to fifteen hours, so that manganese oxide containing nickel is obtained; and the manganese oxide containing nickel and the compound of lithium are uniformly mixed and ground, and are then roasted under the temperature of 700 DEG C to 950 DEG C for eight to thirty hours. The invention has the advantage of simple technique and easy control, and the synthesized cathode material LiNi0.5Mn1.5O4 has good electrochemical properties.

Description

Technical field [0001] The invention relates to a method for synthesizing a positive electrode material for a lithium ion battery, in particular to a 5V lithium ion battery positive electrode material-spinel type nickel-doped lithium manganate LiNi 0.5 Mn 1.5 O 4 The co-precipitation-solid phase synthesis method. Background technique [0002] Spinel type nickel-doped lithium manganate LiNi 0.5 Mn 1.5 O 4 It has many advantages such as high discharge voltage, high specific energy, abundant resources, and low price. After the high-voltage electrolyte problem is solved, this new type of 5V-class lithium-ion battery cathode material has attracted much attention. The existing methods for synthesizing spinel-type nickel-doped lithium manganese oxide include solid phase method and liquid phase method. The solid phase method is simple and easy to implement, but when the synthesis temperature is higher than 650℃, the oxygen defect is very serious, the composition of the material will dev...

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Problems solved by technology

Although nickel-containing manganese carbonate with finer particle size can be obtained by adopting the carbonate co-precipitation method, the conversion rate of nickel-manganese is not high, and the loss of metal ions is easily caused by filtering the mother liquor, causing the composition of the synthetic product to deviate from the stoichiometric ratio. affecting its electrochemical performance

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