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Simple, convenient and efficient boron oxide coated high-nickel ternary positive electrode material and preparation method thereof

A cathode material, boron oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of long production time, low production efficiency, high production cost, and achieve the effect of improving production efficiency

Inactive Publication Date: 2020-01-24
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a simple and efficient boron oxide-coated high-nickel ternary positive electrode material and its preparation method, aiming to solve the problems of long production time, low production efficiency and Technical problems with high production costs

Method used

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preparation example Construction

[0018] A simple and efficient method for preparing a boron oxide-coated high-nickel ternary positive electrode material provided by the present invention comprises the following steps:

[0019] Step S1: Add the lithium source and the nickel-cobalt-manganese ternary composite precursor material into a high-speed mixer in a certain proportion, and mix thoroughly to obtain a mixed material.

[0020] In this step, the ratio n of nickel-cobalt-manganese in the nickel-cobalt-manganese ternary composite precursor material Ni :n Co :n Mn =x: y: 1-x-y, wherein 0.6≤x<1, y≤0.3, the nickel-cobalt-manganese ternary composite precursor is nickel-cobalt-manganese composite hydroxide and / or nickel-cobalt-manganese composite oxide, lithium in the lithium source The ratio to the molar sum of nickel, cobalt, and manganese metals is (1.2-0.9):1.

[0021] Step S2: Sintering the mixed material obtained in step S1 once to obtain an uncoated high-nickel ternary positive electrode material.

[002...

Embodiment 1

[0029] 20kg nickel-cobalt-manganese composite hydroxide precursor with a molar ratio of 83:12:5 of nickel-cobalt-manganese and 9.17kg LiOH·H 2 Add O together into a high-speed mixer, mix for 1 hour, put it into a sagger, bake at 780 °C for 12 hours in an oxygen atmosphere, and jet mill to obtain an uncoated ternary cathode material.

[0030] Put the ternary positive electrode material into a washing tank and wash it with water, stir evenly, the water-to-material ratio is 1, the water temperature is 30°C, the washing time is 20min, and the stirring speed is 250rpm, then inject the uniformly stirred mixture into the filter press, press After filtering, the wet material is obtained, and the obtained wet material is dried in an oven at 100° C. for 6 hours, and the water content is reduced to 0.9%, and then put into a nitrogen-protected high-speed mixer, and a total of 50 g of pentaborane is sprinkled into the atomizer, After mixing for 20 minutes, after the reaction is finished, t...

Embodiment 2

[0036] 20kg of nickel-cobalt-manganese composite hydroxide precursor with a molar ratio of 88:6:6 of nickel-cobalt-manganese and 9.25kg of LiOH·H 2 Add O together into a high-speed mixer, mix for 1 hour, put it into a sagger, bake at 760 °C for 12 hours in an oxygen atmosphere, and jet mill to obtain an uncoated ternary cathode material.

[0037] Put the ternary positive electrode material into a washing tank and wash it with water, stir evenly, the water-to-material ratio is 1, the water temperature is 30°C, the washing time is 20min, and the stirring speed is 250rpm, then inject the uniformly stirred mixture into the filter press, press After filtering, the wet material is obtained, and the obtained wet material is dried in an oven at 100° C. for 6 hours, and the water content is reduced to 1.0%, and then put into a nitrogen-protected high-speed mixer, and a total of 55 g of pentaborane is sprinkled into the atomizer, After mixing for 20 minutes, after the reaction is finished...

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Abstract

The invention belongs to the technical field of lithium batteries and provides a simple, convenient and efficient boron oxide coated high-nickel ternary positive electrode material and a preparation method thereof. In a preparation process, liquid pentaborane is added; and the liquid pentaborane is easy to directly and fully mix with a material, the problem that a solvent needs to be treated in wet coating is not required to be considered; the pentaborane can be quickly hydrolyzed to release heat when meeting water on the surface of the material, so that an oxide coating layer can be formed inan extremely short time; long-term sintering is not needed, and therefore, production efficiency is improved; the surface temperature of the material can be increased to meet a coating requirement when the boron oxide coating layer is formed, and therefore, a user does not to worry about insecure coating caused by insufficient temperature; and in addition, the boiling point of the pentaborane isonly 60 DEG C, the pentaborane which does not participate in a reaction is in a gaseous state when the reaction is finished, and therefore, the pentaborane is very easy to separate and recover from the material, and reaction byproduct hydrogen also has a recovery value.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a simple and efficient boron oxide-coated high-nickel ternary positive electrode material and a preparation method. Background technique [0002] Among the current mainstream lithium-ion battery cathode materials, nickel-cobalt-manganese ternary materials have been widely used in 3C products and new energy vehicles in recent years due to their good comprehensive performance and high cost performance; at the same time , People have also put forward higher and higher requirements for the capacity and cycle performance of ternary materials. In order to meet the relevant needs, increasing the nickel content of ternary materials and modifying ternary materials by surface coating and other means has increasingly become the focus of attention in the industry. High-nickel ternary materials have a higher gram capacity, but poor cycle performance; coating the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/48
CPCH01M4/38H01M4/48Y02E60/10
Inventor 许开华蒋振康廖宁靖徐世国周晓燕栗志涛张玉军李伟施杨
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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