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Ternary positive electrode material having porous structure and preparation method thereof

A technology of positive electrode material and porous structure, which is applied in the field of ternary positive electrode materials and its preparation, can solve the problems of deterioration of electrochemical performance, reduction of lithium ion transmission, material structure damage, etc., achieve a balance between energy density and specific surface area, and shorten the diffusion distance , the effect of high energy density

Inactive Publication Date: 2019-03-29
XIANGYA HOSPITAL CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ternary cathode materials synthesized by the traditional solid phase method and co-precipitation method have the following defects: (1) The secondary particles are relatively dense and have a low specific surface area. The transmission of lithium ions is affected, which affects the performance of the capacity and reduces the rate performance; (2) the particles of the positive electrode material have insufficient stress and strain on the material structure during the lithium ion deintercalation process. Cracks are generated, causing damage to the material structure and deteriorating the electrochemical performance
[0004] CN 108539192A discloses a preparation method of high-voltage cathode materials for lithium-ion batteries with different shapes. The invention can control the battery materials with different shapes through different dispersants, but the capacity of the battery is low, and the specific capacity of the first discharge is not high. More than 150mAh / g

Method used

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  • Ternary positive electrode material having porous structure and preparation method thereof
  • Ternary positive electrode material having porous structure and preparation method thereof
  • Ternary positive electrode material having porous structure and preparation method thereof

Examples

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Embodiment 1

[0035] The preparation method of the ternary positive electrode material with a porous structure of the present invention: 80mL deionized water and 20mL triethylene glycol are prepared into a mixed solution in a 200mL beaker, and the total amount is 0.04mol (the ratio is 8:1:1) Ni(CH3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 2H 2 O and CO(NH 2 ) 2 Dissolve in the above mixture, place the beaker on a magnetic stirrer and stir for 1.5h to dissolve completely. Transfer the dissolved solution to a hydrothermal reaction kettle at 180°C for 16 hours. After it cools down naturally, filter it with suction, wash it three times with deionized water and absolute ethanol, and put the filtered powder in a vacuum drying oven at 120°C. Vacuum drying for 12 hours, the obtained powder was calcined at 500°C for 3 hours in an oxygen atmosphere, and after cooling, the obtained powder was mixed with an excess of 8% LiOH·H 2 O mixed and ground, first calcined at 480°C for 3...

Embodiment 2

[0042] The preparation method of the ternary positive electrode material with a porous structure of the present invention: 80mL deionized water and 20mL triethylene glycol are prepared into a mixed solution in a 200mL beaker, and the total amount is 0.04mol (the ratio is 6:2:2) Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O and Mn(CH 3 COO) 2 2H 2 O and CO(NH 2 ) 2 Dissolve in the above mixture, place the beaker on a magnetic stirrer and stir for 1.5h to dissolve completely. Transfer the dissolved solution to a hydrothermal reaction kettle at 200°C for 10 hours. After it cools down naturally, filter it with suction, wash it three times with deionized water and absolute ethanol, and put the filtered powder in a vacuum drying oven at 120°C. Vacuum drying for 12 hours, the obtained powder was calcined at 450°C for 3 hours in an oxygen atmosphere, and after cooling, the obtained powder was mixed with an excess of 8% LiOH·H 2 O mixed and ground, first calcined at 450°C for...

Embodiment 3

[0045] Ternary cathode material LiNi 0.7 co 0.2 mn 0.1 o 2 The preparation method is the same as that of Example 2, the difference being that the molar ratio of Ni, Co and Mn in the raw material is 7:2:1. According to the same test conditions as in Example 2, the first charge capacity was measured to be 213.4mAh / g, and at a charge and discharge current of 1C, the capacity retention rate after 100 cycles was 94.5%.

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Abstract

The invention discloses a ternary positive electrode material having a porous structure and a preparation method thereof. The chemical formula of the ternary positive electrode material is as follows:LiNixCoyMn1-x-yO2, wherein the x is larger than 0.5 and is less than 1, the y is larger than 0 and is less than 0.3, and x+y is less than 1. In addition, the preparation method of the ternary positive electrode material includes: step one, dissolving nickel salt, cobalt salt and manganese salt in a mixed solvent, adding urea to obtain mixed liquid, transferring the mixed liquid in a hydrothermalreactor, and carrying out reaction for 8 to 40h at a temperature of 120 to 240 DEG; after reaction completion, obtaining a product, carrying out filtering, washing and vacuum drying on the precut, andcarrying out preliminary calcining for 1 to 6 hours at a temperature of 400 to 600 DEG C to obtain an intermediate; and step two, carrying out sintering on the intermediate obtained at the step one and an excess amount of lithium hydroxide to obtain a spindle-shaped ternary positive electrode material having a porous structure. According to the invention, the process is simple; the reaction conditions can be controlled; the product quality is stable; the crystallinity is high; and the size is uniform. The obtained ternary positive electrode material has the high energy density and large specific surface area.

Description

technical field [0001] The invention relates to a ternary cathode material with a porous structure and a preparation method thereof, belonging to the technical field of electrode materials. Background technique [0002] Due to the advantages of high energy density, long cycle life, and environmental friendliness, lithium-ion batteries are widely used in various small power electric vehicles and various portable electronic devices. The positive electrode material is an important factor affecting the performance of lithium-ion batteries, which determines the type of lithium-ion batteries and more than 40% of the material cost. At present, lithium cobalt oxide (LiCoO 2 ) is the mainstream commercial cathode material, but its actual specific capacity is low, and cobalt is expensive and toxic, which limits its further application. In recent years, the ternary cathode material LiNi has been formed by replacing Co with electrochemically active Ni and Mn. x co y mn 1-x-y o 2 ,...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 杨璞蔡舟廖明媚吴凯
Owner XIANGYA HOSPITAL CENT SOUTH UNIV
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