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Lithium battery spherical positive electrode material with lithium fluoride coating layer and preparation method

A positive electrode material and coating layer technology, which is applied in the field of lithium battery spherical positive electrode materials and preparation, can solve the problems of transition metal element dissolution and poor control of spheroidization, and achieve the effect of reducing production costs and improving cycle performance

Inactive Publication Date: 2021-07-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a preparation method of a lithium battery spherical positive electrode material with a lithium fluoride coating layer, which is used to solve the poor control of the spheroidization of the lithium battery positive electrode material in the prior art , the dissolution of transition metal elements, and at the same time, the present invention will also provide lithium battery spherical positive electrode materials with lithium fluoride coating layers

Method used

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  • Lithium battery spherical positive electrode material with lithium fluoride coating layer and preparation method
  • Lithium battery spherical positive electrode material with lithium fluoride coating layer and preparation method
  • Lithium battery spherical positive electrode material with lithium fluoride coating layer and preparation method

Examples

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Embodiment 1

[0046] A preparation method of a lithium battery spherical positive electrode material with a lithium fluoride coating, comprising the steps of:

[0047] Step 1. Add nickel sulfate, cobalt sulfate, and manganese sulfate in order of molar ratio (50:20:30) into excess deionized water to form a mixed solution, slowly add ammonia solution to the mixed solution to adjust the pH of the solution to 11, and keep mechanical stirring After the reaction is complete, the solid is washed after filtration, and dried in a vacuum oven at 78°C to obtain NCM precursor powder;

[0048] Step 2. Disperse NCM precursor powder and lithium carbonate in deionized water, add a small amount of magnesium lithium silicate, heat and stir in a water bath at 45°C for 30min, filter and separate, place in a vacuum furnace and pre-fire at 220°C for 2h form a powder, after which, as attached figure 1 As shown, the powder is transported from the high-pressure nozzle 2 to the fluidized bed cavity at a temperature...

Embodiment 2

[0051] A preparation method of a lithium battery spherical positive electrode material with a lithium fluoride coating, comprising the steps of:

[0052] Step 1. Add nickel sulfate, cobalt sulfate, and manganese sulfate in order of molar ratio (55:25:35) into excess deionized water to form a mixed solution, slowly add ammonia solution to the mixed solution to adjust the pH of the solution to 12, and keep mechanical stirring To complete the reaction, after filtering, the solid matter was washed and dried in a vacuum oven at 83°C to obtain NCM precursor powder;

[0053] Step 2. Disperse NCM precursor powder and lithium carbonate in deionized water, add a small amount of magnesium lithium silicate, heat and stir in a water bath at 50°C for 30min, filter and separate, place in a vacuum furnace and pre-fire at 300°C for 1h form a powder, after which, as attached figure 1 As shown, the powder is transported from the high-pressure nozzle 2 to the fluidized bed cavity at a temperatur...

Embodiment 3

[0055] A preparation method of a lithium battery spherical positive electrode material with a lithium fluoride coating, comprising the steps of:

[0056] Step 1. Add nickel sulfate, cobalt sulfate, and manganese sulfate in order of molar ratio (52:20:30) into excess deionized water to form a mixed solution, slowly add ammonia solution to the mixed solution to adjust the pH of the solution to 12, and keep mechanical stirring After complete reaction, the solid matter was washed after filtration, and dried in a vacuum oven at 80°C to obtain NCM precursor powder;

[0057] Step 2. Disperse NCM precursor powder and lithium carbonate in deionized water, add a small amount of magnesium lithium silicate, heat and stir in a water bath at 50°C for 30min, filter and separate, place in a vacuum furnace and pre-fire at 250°C for 2h form a powder, after which, as attached figure 1 As shown, the powder is transported from the high-pressure nozzle 2 to the fluidized bed cavity at a temperatur...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery spherical positive electrode material with a lithium fluoride coating layer and a preparation method. The preparation method comprises the following steps of stirring a mixed solution formed by nickel sulfate, cobalt sulfate and manganese sulfate until the complete reaction is completed, and washing and drying solids to obtain NCM precursor powder; heating and stirring the NCM precursor powder, lithium carbonate and magnesium lithium silicate, pre-sintering at 200-300 DEG C, sintering in a fluidized bed, back-blowing the powder by hydrogen fluoride and argon, and filtering to obtain the lithium battery spherical positive electrode material with the lithium fluoride coating layer. According to the present invention, the problems of poor spheroidization control and transition metal element dissolution of the lithium battery positive electrode material in the prior art are solved. The lithium battery spherical positive electrode material with the lithium fluoride coating layer prepared by the preparation method has better spheroidized morphology, and the lithium fluoride serves as the coating layer, so that the cycle performance of the battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium battery spherical cathode material with a lithium fluoride coating layer and a preparation method. Background technique [0002] Lithium-ion battery is a secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, lithium ions intercalate and deintercalate back and forth between the two electrodes: during charging, lithium ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-based batteries are divided into lithium batteries and lithium-ion batteries. Lithium-ion batteries are used in mobile phones and laptops, commonly known as lithium batteries. Batteries generally use materials contai...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 陈庆廖健淞司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD
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