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Porous spherical lithium ion battery ternary positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of positive electrode materials for lithium-ion batteries, can solve the problems of poor material rate performance and stability, and achieve improved rate performance and stability, high charge-discharge specific capacity, and low cost Effect

Inactive Publication Date: 2018-05-29
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the capacity of the ternary cathode material continues to increase, the rate performance and stability of the material will deteriorate, which will inevitably become a hidden danger in this era of "fast charging".

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  • Porous spherical lithium ion battery ternary positive electrode material and preparation method thereof
  • Porous spherical lithium ion battery ternary positive electrode material and preparation method thereof

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preparation example Construction

[0031] A method for preparing a porous spherical lithium-ion battery ternary positive electrode material, comprising the following steps: step 1), preparing a multi-component mixed solution of nickel salt, cobalt salt, and manganese salt according to the ratio of Ni:Co:Mn=8:1:1 , the total ion concentration is 1mol / L-1.5mol / L;

[0032] Step 2), configure 0.1-4g / L water-soluble carbon source solution, hydrothermally react at 150-200°C for 10-15h to obtain the carbon sphere precursor, and store the carbon sphere precursor at 1000-1200°C under the protection of protective gas Sintering for 9-12 hours to obtain carbon spheres and impregnating them in the multi-component solution of a;

[0033] Step 3), the mixed solution of b obtained above, 6-8mol / L ammonia water and 7.5-10mol / L sodium hydroxide are added to the reaction device containing the bottom liquid in parallel, and the feeding speed of the mixed multi-component solution is adjusted to 100-140ml / min, sodium hydroxide feed...

Embodiment 1

[0036] Prepare a sulfate solution with a total metal ion concentration of 1.5mol / L (Ni:Co:Mn=8:1:1), first weigh 2g of glucose and dissolve it in deionized water, and obtain hard carbon by hydrothermal reaction and heat treatment microspheres and disperse them in the mixed solution. Flow the above mixed solution together with ammonia water and sodium hydroxide into a reaction kettle containing a mixture of sodium hydroxide and ammonia water, adjust the rotation speed of the reaction kettle to 300r / min, and the temperature to 55 degrees. Adjust the ammonium root concentration of the mother liquor to 6-8g / L, and the pH to 12, so that the components that have been mixed uniformly in the solution are co-precipitated according to the chemical dosage ratio. Then take lithium hydroxide: the precursor = 1.05:1, pre-sinter at 400-450°C for 2 hours in an oxygen atmosphere, and then heat up to 800-1000°C for 15 hours to obtain the porous spherical ternary material .

[0037] The porous...

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Abstract

Disclosed is a preparation method of a porous spherical lithium ion battery ternary positive electrode material. The preparation method comprises the following steps of 1) preparing a multi-element mixed solution of a nickel salt, a cobalt salt and a manganese salt; 2) performing a hydrothermal reaction on a carbon source to obtain a carbon sphere precursor, and performing sintering on the carbonsphere precursor to obtain carbon sphere, and enabling the obtained carbon sphere to be immersed in the multi-element mixed solution obtained in the step 1); 3) enabling the mixed solution obtained inthe step 2) to be mixed with ammonia water and a sodium hydroxide solution and then to be added to a reaction apparatus comprising a base solution to be subjected to a co-precipitation reaction to obtain a sodium hydroxide precursor; and 4) performing washing on the sodium hydroxide precursor obtained in the step 3) and then performing heat treatment on the precursor and lithium salt to obtain the ternary positive electrode material. The porous spherical lithium ion battery ternary positive electrode material is high in degree of sphericity, uniform in particle distribution, relatively largein specific surface area and tap density, and suitable for lithium ion transfer by virtue of the internal porous structure, so that the rate capability and stability of the material can be improved effectively; and in addition, the preparation method is simple, easily controlled and suitable for industrial production.

Description

technical field [0001] The invention relates to a positive electrode material of a lithium ion battery, in particular to a porous spherical lithium ion battery ternary positive electrode material and a preparation method thereof. Background technique [0002] Currently, fossil fuels remain the main source of electricity. However, with the unreasonable mining and utilization of human beings, the shortage of fossil energy is becoming increasingly serious, and the environmental pollution is becoming more and more serious. Therefore, the development and utilization of new clean resources and renewable energy, such as solar energy, wind energy, tidal energy, etc., has become a top priority. But on the other hand, the normal operation of the power grid requires stable and continuous power generation. Solar energy, wind energy, and tidal energy are restricted by factors such as weather, location, and time, which greatly limits their large-scale application and popularization. To ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 汤依伟尚国志郭权文文定强
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD