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Preparation method of lithium ion battery cathode material NCA with high specific energy

A cathode material and energy technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor material performance, non-normal use, and high nickel content, and achieve the effect of improving cycle performance, stable structure, and no sintering process.

Inactive Publication Date: 2016-07-27
HENAN KELONG NEW ENERGY CO LTD
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Problems solved by technology

The most difficult problem to overcome in the synthesis of high-nickel materials is mainly sintering and material processing performance. Because the nickel content is high, the requirements for the atmosphere of the sintering furnace are very high. The ordinary sintering method cannot meet this requirement, and the blind The use of an oxygen atmosphere increases the cost, and secondly, the performance of the material itself is not good; in addition, because of the high nickel content, the pH of the material and the high residual lithium content on the material surface, the material is very easy to absorb water during processing, which leads to domestic battery factory customers. Normal use of this high nickel material

Method used

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  • Preparation method of lithium ion battery cathode material NCA with high specific energy

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Embodiment 1

[0017] The preparation method of high specific energy lithium battery cathode material NCA comprises the following steps:

[0018] 1) Mix the nickel sulfate solution, cobalt sulfate solution and aluminum sulfate solution according to the Ni:Co:Al molar ratio of 80:15:5, then add NaOH solution to the solution for neutralization, and produce a ternary system by controlling the crystallization method Hydroxide Ni 0.8 co 0.15 Al 0.05 (OH) 2 precipitation. Then the obtained precipitate was filtered, washed, and dried at 90° C. for 4 hours;

[0019] 2) In the atmosphere furnace, air is introduced, and the dried product obtained in step 1) is heat-treated at 300° C. for 8 hours and then cooled naturally;

[0020] 3) Mix the oxide and lithium hydroxide obtained in step 2) according to the molar ratio of metal cations in the oxide to Li ions of 1:1.02, and after fully mixing, divide the reactants in an air flow or an oxygen flow. Two-stage sintering, first sintering at 450°C for ...

Embodiment 2

[0023] 1) Mix nickel chloride solution, cobalt chloride solution and aluminum chloride solution according to Ni:Co:Al molar ratio of 82:15:3, then add NaOH solution to the solution for neutralization, and produce by controlled crystallization method Ternary hydroxide Ni 0.82 co 0.15 Al 0.03 (OH) 2 The precipitate is then filtered, washed, and dried at 100°C for 5 hours;

[0024] 2) In the atmosphere furnace, air is introduced, and the dried product obtained in step 1) is heat-treated at 350° C. for 9 hours and then cooled naturally;

[0025] 3) Mix the oxide and lithium hydroxide obtained in step 2) according to the molar ratio of metal cations in the oxide to Li ions of 1:1.03, after fully mixing, divide the reactants in the air flow or oxygen flow Two-stage sintering, first sintering at 500°C for 7 hours under air flow, then raising the sintering temperature to 720°C, and then sintering in oxygen flow for 12 hours, and cooling with the furnace after sintering;

[0026] ...

Embodiment 3

[0028] 1) Mix nickel nitrate solution, cobalt nitrate solution and aluminum nitrate solution according to Ni:Co:Al molar ratio of 85:10:5, then add NaOH solution to the solution for neutralization, and produce ternary system by controlled crystallization method Hydroxide Ni 0.85 co 0.1 Al 0.05 (OH)2 precipitation. Then the obtained precipitate was filtered, washed, and dried at 120° C. for 6 hours;

[0029] 2) In the atmosphere furnace, feed oxygen or air, heat-treat the dried product obtained in step 1) at 400° C. for 10 hours, and then cool it naturally;

[0030] 3) The oxide and lithium carbonate obtained in step 2) are mixed according to the molar ratio of metal cations in the oxide to Li ions of 1:1.05, after fully mixing, the reactants are divided into two parts in an air stream or an oxygen stream. Segment sintering, first sintering at 550°C for 6 hours in air flow, then raising the sintering temperature to 760°C, and then sintering in oxygen flow for 25 hours, and ...

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Abstract

The invention discloses a preparation method of a lithium ion battery cathode material NCA with high specific energy. The method comprises the following steps: (1) nickel salt, cobalt salt and aluminium salt are mixed, a NaOH solution is added, ternary system hydroxide deposition is produced by a controlled crystallization method, filtering and washing are carried out, and drying is carried out; (2) in an atmosphere oven, air or oxygen is pumped in, calcination is carried out, and ternary composite oxide is obtained; (3) the oxide and the lithium salt are mixed, a reactant is sintered in two stages in air flow or oxygen flow, and the reactant is cooled in furnace; (4) an oxalic acid solution is used for cleaning, centrifugal drying as well as drying and sintering are carried out in order to obtain a composite oxide, crushing and grading are carried out, the oxide is sieved by a 300 mesh sieve, and the ternary system composite oxide LixNi1-y-zCoyAlzO2 is obtained, wherein x is more than or equal to 1 and less than or equal to 1.15, y is more than or equal to 0.05 and less than or equal to 0.15, and z is more than or equal to 0 and less than or equal to 0.05. The preparation method has a low requirement for synthesis devices, the operation is simple, and the sintering process does not have special requirements. The synthesized material has a stable structure and is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a preparation method of NCA, a high specific energy lithium battery cathode material. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, long cycle life, stable working voltage, and small self-discharge, and are considered to be one of the batteries with development potential. In recent years, with the continuous strengthening of portable electronic products (such as notebook computers, mobile phones, camcorders, digital cameras, cordless power tools, etc.), the demand for lithium-ion battery market has maintained a very high growth rate; with the application of lithium-ion batteries With the continuous expansion of the field, the market demand for it is increasing, but its price is too high. Therefore, reducing production costs and improving battery capacity and other performances have become the main direc...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCY02E60/10
Inventor 常敬杭徐云军李明露张兴帅郝智敏程迪韩红芳
Owner HENAN KELONG NEW ENERGY CO LTD
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