Hollow microsphere structure lithium ion battery ternary positive electrode material and preparation method thereof

A lithium-ion battery, hollow microsphere technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of difficult to control the baking temperature and method of process conditions, low first charge and discharge efficiency, complex synthesis process, etc. The effect of large reactive area, improved electrochemical performance and high purity

Active Publication Date: 2019-01-25
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ternary materials also have some disadvantages: low initial charge and discharge efficiency, relatively complex synthesis process, serious ion mixing phenomenon, and low tap density
[0004] Although the co-precipitation method can achieve uniform mixing between components at the molecular / atomic level by controlling the co-precipitation reaction, and prepare nanoparticles with controllable morphology and particle size, the process is long and complicated, and the process conditions (stoichiometric ratio, precipitation, etc.) The physical properties of the substance, pH, temperature, solvent and solution concentration, mixing method and stirring speed, roasting temperature and method, etc.) are difficult to control

Method used

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  • Hollow microsphere structure lithium ion battery ternary positive electrode material and preparation method thereof
  • Hollow microsphere structure lithium ion battery ternary positive electrode material and preparation method thereof
  • Hollow microsphere structure lithium ion battery ternary positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this example, LiNi with a diameter of 10 μm was synthesized by the sol-gel method 0.5 co 0.2 mn 0.3 o 2 hollow microspheres. Wherein, the diameter of the primary particles used to assemble the microspheres is not greater than 600nm.

[0052] The preparation method is as follows:

[0053] (1) Weigh 1.1049g anhydrous nickel acetate (Ni(CH 3 COO) 2 ), 0.6227g cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O), 0.6488g anhydrous manganese acetate (Mn(CHCOO) 2 ) and 1.3389g lithium acetate dihydrate (LiCH 3 COO·2H 2 O) Dissolve in 30ml deionized water to form solution A.

[0054] (2) Weigh 5.2535g of citric acid and dissolve it in 20ml of deionized water to form solution B.

[0055] (3) Solution B obtained in step (2) was slowly added dropwise to solution A obtained in step (1), stirred at 60°C for 3 hours, then stirred at 80°C for 3-4 hours until a purple transparent sol was formed.

[0056] (4) Dry the sol obtained in step (3) in an oven at 120°C for 12 h...

Embodiment 2

[0062] In this example, LiNi with a diameter of 10 μm was synthesized by the sol-gel method 0.6 co 0.2 mn 0.2 o 2 hollow microspheres.

[0063] The preparation method is as follows:

[0064] (1) Weigh 1.326g of anhydrous nickel acetate (Ni(CH 3 COO) 2 ), 0.6227g cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O), 0.4326g anhydrous manganese acetate (Mn(CHCOO) 2 ) and 1.3389g lithium acetate dihydrate (LiCH 3 COO·2H 2 O) Dissolve in 200ml deionized water to form solution A.

[0065] (2) Weigh 3.1521 g of citric acid and dissolve it in 50 ml of deionized water to form solution B.

[0066] (3) Slowly add the B solution obtained in step (2) to the A solution obtained in step (1) drop by drop, adjust the pH to between 7 and 8 with ammonia water, and then stir at 80°C for 5 to 6 hours until a purple color is formed Transparent sol.

[0067] (4) Dry the sol obtained in step (3) in an oven at 180°C for 12 hours to obtain a xerogel; then place the xerogel in a tube furna...

Embodiment 3

[0072] In this example, LiNi with a diameter of 10 μm was synthesized by the sol-gel method 0.5 co 0.2 mn 0.3 o 2 hollow microspheres.

[0073] Concrete steps are identical with embodiment 1, and difference is: the total volume of solution A is 200ml in the step (1); The total volume of solution B is 50ml in the step (2); The stirring system in the step (3) is 80 ℃ of water bath conditions Under 5 ~ 6h, in addition to adjust the pH to between 7 ~ 8.

[0074] from Figure 7 As can be seen from the EDS energy spectrum diagram, the chemical formula of the hollow microspheres obtained by the present invention is LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0075] LiNi prepared in this embodiment 0.5 co 0.2 mn 0.3 o 2 The X-ray diffraction (XRD) pattern of the hollow microspheres is shown in figure 1 , it can be seen from the figure that the peak intensity ratio of 003 and 104 has reached 1.5364 (much greater than 1.2), indicating that the mixing of lithium and nickel is not seriou...

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Abstract

The invention discloses a lithium ion battery ternary positive electrode material with a hollow microsphere structure and a preparation method thereof. The material is prepared from hollow microspheres formed by assembling LiNixCoyMnzO2 primary particles; the diameters of the microspheres are not greater than 20mum; the diameters of the primary particles are not greater than 600 nanometers; x, y and z are proportions of the molar numbers of corresponding elements in the total molar number of three elements of Ni, Co and Mn respectively; x is greater than or equal to 0.5 and small than or equal to 0.6; y is greater than or equal to 0.1 and smaller than or equal 0.2; z is greater than or equal to 0.1 and less than or equal to 0.3; x+y+z=1. A sol-gel method is adopted for preparing the lithium ion battery ternary positive electrode material. The microspheres with hollow structures have large specific surface area, fully contact electrolyte, and are beneficial to reduction of lithium ion diffusion impedance. The positive electrode material has high cycling stability, and damage to the structure of the material caused by size expansion in a cycling process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and relates to a ternary cathode material of a lithium-ion battery with a hollow microsphere structure and a preparation method thereof. Background technique [0002] With the continuous development of science and technology, the traditional fossil energy is gradually exhausted, and the environmental pollution caused by it makes us have to seek new clean energy to replace traditional energy. Although fuel cells provide the highest energy density, due to electrocatalysis, hydrogen storage and other technologies, they are far from meeting the requirements of practical applications. Although nickel-cadmium batteries and nickel-metal hydride batteries have a stable discharge platform, long cycle life and good rate performance, the cost of nickel-cadmium batteries is high and they have memory effects. Compared with nickel-cadmium batteries, nickel-metal hydride batteries u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 曾宏陈超武英闫东伟戚雯胡小萍候立婷
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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