A kind of preparation method of high-voltage nickel-cobalt-manganese-lithium oxide positive electrode material

A technology of nickel-cobalt-manganese-lithium and positive electrode materials, applied in battery electrodes, electrochemical generators, circuits, etc., can solve problems such as cycle life attenuation, and achieve the effect of simple process

Active Publication Date: 2016-08-24
TIANJIN B&M SCI & TECH
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Problems solved by technology

[0004] Studies have shown that after the conventional 523-type nickel oxide cobalt manganese lithium positive electrode material increases the charge-discharge termination voltage from 4.2V to 4.35V (full battery test), the 1C specific capacity can be increased from 155mAh / g to more than 165mAh / g, but its The cycle life under high voltage system will decrease sharply

Method used

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  • A kind of preparation method of high-voltage nickel-cobalt-manganese-lithium oxide positive electrode material
  • A kind of preparation method of high-voltage nickel-cobalt-manganese-lithium oxide positive electrode material
  • A kind of preparation method of high-voltage nickel-cobalt-manganese-lithium oxide positive electrode material

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preparation example Construction

[0023] The preparation method of the high-voltage nickel-cobalt-manganese-manganese lithium oxide positive electrode material of the present invention comprises the following steps:

[0024] 1) Use a high-speed mixer to uniformly mix the ternary material precursor powder, lithium carbonate powder, and oxide powder of the metal element M in proportion, and then place it in a bell furnace at a rate of 5-10°C / min in an air atmosphere Heat up, heat at 730-800°C for 4-6h, then continue to heat up to 880-980°C for constant temperature roasting for 4-8h, then cool down to room temperature with the furnace, after crushing and sieving, high-voltage nickel-cobalt-manganese-lithium oxide primary powder is obtained ;

[0025] 2) Establish coating system A: use deionized water and the salt corresponding to the coated metal element X to configure a solution for coating the metal element X; add inducer and urea to the solution, and stir at a constant speed for 0.2-1h; Add ammonia water unti...

Embodiment 1

[0034] 2kg of ternary material precursor powder (manufacturer: Ningbo Jinhe New Materials Co., Ltd.), 0.870kg of lithium carbonate powder, and 1.752g of titanium dioxide powder were uniformly mixed with a high-speed mixer, and the speed of the high-speed mixer was 800rpm. Put the mixture in a bell furnace, heat up at a rate of 6°C / min in an air atmosphere, keep it at 750°C for 6 hours, then continue to heat up to 930°C for 6 hours, then cool down to room temperature with the furnace, after crushing and sieving Obtain primary powder of high-voltage nickel-cobalt-manganese-lithium oxide material;

[0035]Configure 5L of a mixed solution of magnesium nitrate and aluminum nitrate, wherein the concentration of magnesium nitrate is 0.02mol / L, and the concentration of aluminum nitrate is 0.01mol / L; add 0.5mol edetate disodium and 1mol urea to the solution, and stir at a constant speed 1h; add a small amount of ammonia water to the solution until the pH of the solution system is betwe...

Embodiment 2

[0041] 2 kg of ternary material precursor powder (same as above), 0.830 kg of lithium carbonate powder, and 2.358 g of titanium dioxide powder were uniformly mixed with a high-speed mixer, and the speed of the high-speed mixer was 900 rpm. Put the mixture in a bell-type furnace, heat up at a rate of 6°C / min in an air atmosphere, keep it at 780°C for 4 hours, then continue to heat up to 960°C for 6 hours, then cool down to room temperature with the furnace, after crushing and sieving Obtain primary powder of high-voltage nickel-cobalt-manganese-lithium oxide material;

[0042] Prepare 8L of aluminum nitrate solution, the concentration of aluminum nitrate is 0.01mol / L; add 0.4mol / L disodium edetate and 8mol / L urea to the solution, stir at a constant speed for 0.5h; add a small amount of ammonia water to the solution until the solution system pH between 6.5 and 7.0;

[0043] Add 2 kg of nickel oxide cobalt manganese lithium primary material to be coated into the prepared solutio...

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Abstract

The invention discloses a preparation method for a high-voltage nickel-cobalt-manganese-lithium oxide positive electrode material. The method comprises the steps of introducing a metal element into the structure of a nickel-cobalt-manganese-lithium oxide primary material to stabilize the structure in a doping way; creating a rate-controllable homogeneous cladding system by virtue of characteristics of a sustained release hydroxide radical of urea and an induction effect of a revellent on metal ions in a process of cladding the primary material. By such a cladding method, metal compounds can be slowly generated and are sequentially adhered to the surface of the nickel-cobalt-manganese-lithium oxide primary material to finally form a layer of uniform cladding film. The nickel-cobalt-manganese-lithium oxide positive electrode material synthesized by the preparation method has high cycle performance under a high-voltage condition (4.35V).

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of a nickel oxide cobalt manganese lithium positive electrode material suitable for a high voltage system. Background technique [0002] The nickel-cobalt-manganese-lithium cathode material is a cathode material with a layered structure. Because it has the advantages of both lithium nickelate and lithium cobaltate, and is cheap and easy to synthesize, it is considered to be the most likely to replace lithium cobaltate. Cathode materials are also a hot spot in the research of lithium-ion batteries today. At present, the most market-competitive product in the nickel-cobalt-manganese-lithium cathode material is the 523-type cathode material, which has a composition of nickel-cobalt-manganese three elements with a molar ratio of 5:2:3. Considering the structural stability of the material At the same time, it highli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62
CPCH01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 徐宁程晓焜吴孟涛唐淼吕菲魏玉研
Owner TIANJIN B&M SCI & TECH
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