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Gas phase precipitation carbon-coated phosphate lithium battery positive electrode material and preparation method thereof

A cathode material, vapor deposition technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor carbon coating uniformity and poor conductivity, and achieve the promotion of integrity, good coating effect, and improved conductivity. and the effect of 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

AI Technical Summary

Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a positive electrode material and a preparation method for a lithium phosphate battery coated with vapor deposition carbon, which is used to solve the problem of uniformity of carbon coating in the preparation of phosphate materials in the prior art. Problems with poor, poor conductivity

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  • Gas phase precipitation carbon-coated phosphate lithium battery positive electrode material and preparation method thereof
  • Gas phase precipitation carbon-coated phosphate lithium battery positive electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] A method for preparing a positive electrode material of a lithium phosphate battery coated with vapor deposition carbon, comprising the steps of:

[0033] Step 1, the preparation of phosphate cathode material precursor: according to the molar ratio of Li:iron:P is 1.1:1:1, get the acetate of lithium hydroxide, iron and ammonium phosphate, obtain mixed powder after mixing; Mix methanol and deionized water at a volume ratio of 1:1 to obtain a mixed solution; add the mixed powder to the mixed solution, use ammonia water and dilute hydrochloric acid to adjust the pH to 8, stir, mix well, and then hydrothermally react for 5 hours at a temperature of 150°C , naturally cooled to room temperature, filtered and dried to obtain the precursor powder of phosphate cathode material,

[0034] Step 2, carbon coating process: the phosphate positive electrode material precursor powder and metal magnesium powder obtained in step 1 are subjected to dry ball milling in a mass ratio of 100:1...

Embodiment 2

[0036] A method for preparing a positive electrode material of a lithium phosphate battery coated with vapor deposition carbon, comprising the steps of:

[0037] Step 1, the preparation of the phosphate cathode material precursor: according to Li: cobalt: the molar ratio of P is 1.2:1:1, take the acetate of lithium hydroxide, cobalt and ammonium phosphate, obtain mixed powder after mixing; Mix methanol and deionized water at a volume ratio of 1:1 to obtain a mixed solution; add the mixed powder to the mixed solution, use ammonia water and dilute hydrochloric acid to adjust the pH to 7.5, stir, mix well, and then hydrothermally react for 3 hours at a temperature of 180°C , naturally cooled to room temperature, filtered and dried to obtain phosphate positive electrode material precursor powder;

[0038] Step 2, carbon coating process: the phosphate positive electrode material precursor powder and metal magnesium powder obtained in step 1 are subjected to dry ball milling in a ma...

Embodiment 3

[0040] A method for preparing a positive electrode material of a lithium phosphate battery coated with vapor deposition carbon, comprising the steps of:

[0041] Step 1, the preparation of phosphate cathode material precursor: according to Li: manganese: the molar ratio of P is 1.1:1:1, get the acetate of lithium hydroxide, manganese and ammonium phosphate, obtain mixed powder after mixing; Mix methanol and deionized water at a volume ratio of 1:1 to obtain a mixed solution; add the mixed powder to the mixed solution, use ammonia water and dilute hydrochloric acid to adjust the pH to 8, stir, mix well, and then hydrothermally react for 4 hours at a temperature of 140°C , naturally cooled to room temperature, filtered and dried to obtain phosphate positive electrode material precursor powder;

[0042] Step 2, carbon coating process: the phosphate cathode material precursor powder and metal magnesium powder obtained in step 1 are subjected to dry ball milling in a mass ratio of ...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a gas phase precipitation carbon-coated phosphate lithium battery positive electrode material, a preparation method and a lithium battery, the preparation method comprises the following steps: 1, taking lithium hydroxide, acetate of metal A and ammonium phosphate, mixing, mixing with a mixed solution of benzyl alcohol and deionized water, adjusting the pH to 7.5-8, stirring, carrying out hydrothermal reaction for 3-6 hours, naturally cooling to room temperature, filtering and drying to obtain phosphate positive electrode material precursor powder; and 2, carrying out dry ball milling on the phosphate positive electrode material precursor powder and metal magnesium powder, carrying out heat preservation for 2 hours at 300-500 DEG C under the protection of argon, replacing argon and carbon dioxide as a gas source, rapidly heating to 500-750 DEG C, carrying out heat preservation for 6-8 hours, cooling to room temperature, washing and drying to obtain the phosphate lithium battery positive electrode material. The surface of a phosphate positive electrode material precursor material is coated with metal magnesium powder through a ball milling process, and a carbon coating process is carried out through magnesiothermic reduction in a sintering process, so that the positive electrode material with a relatively good coating effect is obtained.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cathode material of a phosphate lithium battery coated with vapor-phase deposited carbon and a preparation method thereof. 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 ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 廖健淞陈庆司文彬李钧
Owner CHENDU NEW KELI CHEM SCI CO LTD