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Preparation method of single-crystal Li(NiCoMn)O2 ternary cathode material

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the direction of chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of resorcinol and formaldehyde, which are toxic and irritating, and achieve easy control of the process and improve Effects of improving energy density and cycle performance

Inactive Publication Date: 2015-08-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chen Jian (201410512794.X) disclosed the synthesis of LiNi by hydrothermal method x co y mn z o 2 Positive electrode material, the charge and discharge performance of this material is as high as 177.3mAh / g at 0.5C, but the resorcinol and formaldehyde used in this method are toxic and irritating, and the discharge specific capacity at 10C is only 141.7mAh / g

Method used

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  • Preparation method of single-crystal Li(NiCoMn)O2 ternary cathode material
  • Preparation method of single-crystal Li(NiCoMn)O2 ternary cathode material
  • Preparation method of single-crystal Li(NiCoMn)O2 ternary cathode material

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Embodiment 1

[0031] A preparation method of single crystal nickel cobalt lithium manganese oxide ternary positive electrode material, the specific steps are:

[0032] 1) 2.98g Ni(CH 3 COO) 2 4H 2 O, 1.00g Co(CH 3 COO) 2 4H 2 O and 0.98g Mn(CH 3 COO) 2 4H 2 O, dissolve in 80mL deionized water and ethylene glycol mixed solution (volume ratio 1:1), stir evenly, add 1.5g CTAB after it is completely dissolved, add 2.65g oxalic acid after it is completely dissolved, stir until completely well mixed.

[0033] 2) Transfer the homogeneous mixture obtained in step 1) to a stainless steel reaction kettle, seal it, place it in a blast drying oven, and react at 200°C for 10 hours;

[0034] 3) After the reaction, take out the reactor and cool it down to room temperature, centrifuge the precursor solution in the reactor for 5 times, then place it in a blast drying oven, and dry it at 80°C for 24 hours to obtain the precursor. Its SEM morphology is as follows figure 1 shown;

[0035] 4) Add 0.81...

Embodiment 2

[0040] A preparation method of single crystal nickel cobalt lithium manganese oxide ternary positive electrode material, the specific steps are:

[0041] Step is identical with the step in embodiment 1, difference is that in step 4) the LiNO of 0.81g 3 Add it to 2g of the precursor in step 3), and after grinding and mixing, place it in an air-atmosphere pre-calcination furnace for pre-calcination, with a heating rate of 5°C / min to a pre-fire temperature of 450°C, and constant temperature pre-fire for 10 hours , cooled to room temperature to obtain the oxide. Then place the oxide in a calciner for high-temperature calcination. The temperature rises at a rate of 10°C / min to 500°C. After 10 hours of constant temperature, the temperature is raised to 700°C at 10°C / min. ℃, calcined for 24h, and cooled to room temperature at 10℃ / min to obtain LiNi 0.6 co 0.2 mn 0.2 o 2 Ternary cathode material with a mass of about 1.9g.

[0042] Will get LiNi 0.6 co 0.2 mn 0.2 o 2 The X-ra...

Embodiment 3

[0046] A method for preparing a single crystal nickel-cobalt lithium manganese oxide ternary positive electrode material, the specific steps are:

[0047] 1) 1.23g NiCO 3 , 0.41g CoCO 3 and 0.40g MnCO 3 , dissolve in 80mL deionized water and ethylene glycol mixed solution (volume ratio 1:2), stir well, add 1.5g CTAB after it is completely dissolved, add 2.65g oxalic acid after it is completely dissolved, stir until completely mixed .

[0048] 2) Transfer the homogeneous mixture obtained in step 1) to a stainless steel reaction kettle, seal it, place it in a blast drying oven, and react at 220° C. for 6 hours;

[0049] 3) After the reaction, take out the reaction kettle and cool it to room temperature, centrifuge the precursor solution in the reaction kettle for 5 times, then place it in a blast drying oven, and dry it at 80°C for 24 hours to obtain the precursor;

[0050] 4) Add 0.81g of LiNO 3 Add it to 2g of the precursor in step 3), after grinding and mixing, place it ...

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Abstract

The invention relates to a preparation method of a single-crystal Li(NiCoMn)O2 ternary cathode material, and belongs to the technical field of a manufacturing process for chemical electrode materials. The preparation method comprises the following steps: firstly, nickel salt, cobalt salt and manganese salt are dissolved in a deionized water and ethylene glycol mixed solution, the mixture is uniformly stirred, a surfactant is added, the mixed solution is clarified, a precipitant is added, the mixture is uniformly stirred and poured into a reactor, the reactor is arranged in a drying oven for a reaction, and then an obtained precursor and lithium salt are mixed, presintered and calcined to obtain a target product. The preparation method is simple and convenient to operate, the controllability of preparation parameters is high, the prepared ternary cathode material is a single-crystal material, particle sizes are concentrated at the submicron dimension, a fast conveying channel with the short path is provided for lithium ions, and contact of the material with an electrolyte is increased. The ternary cathode material has high specific capacity, high rate capability and high cycling stability, and meets the requirements of electronic products with high volume energy density.

Description

technical field [0001] The invention relates to a method for preparing a single-crystal nickel-cobalt-lithium manganese oxide ternary positive electrode material, and belongs to the technical field of chemical electrode material manufacturing technology. Background technique [0002] With the continuous progress of society, the deterioration of the environment and the lack of fossil non-renewable resources, people's demand for new energy is becoming more and more urgent. As a green energy lithium-ion battery, since its successful development in the early 1990s, it has unique advantages such as high specific energy, high working voltage, wide application temperature range, low self-discharge rate, long cycle life, and no pollution. It has attracted much attention and has been widely used in small portable electronic products such as mobile phones, digital cameras, and notebook computers, and has gradually become one of the most important candidate power sources for electric v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01G53/00
CPCC01G53/00H01M4/5825Y02E60/10
Inventor 吴伯荣穆道斌王垒许洪亮盖亮刘琦陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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