Method for preparing lithium-ion battery cathode material with gas phase deposition

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unsatisfactory performance and low discharge capacity, and achieve increased charge and discharge capacity, overall performance, and specific surface area. falling effect

Active Publication Date: 2011-08-31
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all oxidize the graphite surface by the gas phase method. Although the reactivity between the negative electrode material and the electrolyte is improved, the discharge capacity is lower than that of unoxidized graphite, and the performance in other aspects is not satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Take 200kg of graphite and add it to a jet mill and a jet classifier successively for pulverization and classification. After pulverization and classification, the graphite powder has an average particle diameter of D50=17.892 μm and a tap density of 1.0225 g / cm 3 , The specific surface area is 4.9㎡ / g. Add 100kg of crushed and classified graphite powder to the reaction kettle, add 35kg of mixed acid of sulfuric acid and nitric acid, add appropriate amount of water, stir for 15min, stir and reflux at 360°C for 12h, then add 15kg of ferric chloride, add water and stir Make a paste, react for 2 hours, add water to cool, continue to add water and wash at a speed of 500 rpm in a centrifugal filter washing equipment for 1 hour until the pH value is neutral, and dry in an oven at 80°C for 2 hours after centrifugal dehydration until the water content is less than 0.2%, the measured carbon content of the sample is 99.96%. At 20°C, take 150g of the dried graphite powd...

Embodiment 2

[0020] Example 2: Take 250kg of graphite and add it to a rotary high-speed pulverizer and an airflow classifier successively for pulverization and classification. After pulverization and classification, the graphite powder has an average particle size of D50=27.273 μm and a tap density of 0.997 g / cm 3 , The specific surface area is 4.0㎡ / g. Add 100kg of pulverized and classified graphite powder to the reaction kettle, add 35kg of mixed acid of sulfuric acid and nitric acid, add appropriate amount of water, stir for 10min, stir and reflux at 100°C for 24h, then add 15kg of ferric chloride, add water and stir Make a paste, react for 2 hours, add water to cool, continue to add water and wash at a speed of 500 rpm in a centrifugal filter washing equipment for 1 hour until the pH value is neutral, and dry in an oven at 80°C for 2 hours after centrifugal dehydration until the water content is less than 0.2%, the measured carbon content of the sample is 99.96%. At 20°C, take 150g of ...

Embodiment 3

[0021] Embodiment 3: Get 250kg of graphite and add successively in ultrafine pulverizer and airflow classifier to carry out pulverization classification, the graphite powder average particle diameter D50=6.109 μ m after pulverization classification, tap density is 0.713g / cm 3 , The specific surface area is 7.4㎡ / g. Add 100kg of pulverized and classified graphite powder to the reaction kettle, add 35kg of mixed acid of sulfuric acid and nitric acid, add appropriate amount of water, stir for 5min, stir and reflux at 50°C for 18h, then add 15kg of nitriloacetic acid, add water and stir to form Paste, react for 4 hours, add water to cool, continue to add water to wash at 2000 rpm in the centrifugal filter washing equipment for 15 minutes until the pH value is neutral, after centrifugal dehydration, dry in an oven at 150°C for 2 hours until the moisture is less than 0.2 %, the measured carbon content of the sample was 99.97%. At 25°C, take 200g of the dried graphite powder and add ...

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PUM

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Abstract

The invention relates to a method for preparing a lithium-ion battery cathode material with gas phase deposition, comprising the following steps of: grinding graphite in different levels; purifying the grounded graphite; washing the ground graphite until the pH value is neutral, dehydrating and drying; soaking the ground graphite in doped polyvalent transition metal salt solution with the concentration of 0.1M-0.8M, and then filtering, dehydrating and drying; placing the ground graphite in a heat process furnace, vacuuming and feeding pyrolysis gas and protective gas in the volume ratio of 1:1, heating to 800-1500 DEG C, keeping the inner pressure of the furnace at 0.5-5 kpa, keeping the temperature for 0.5-96 hours; and cooling and taking out of the furnace to obtain the lithium-ion battery cathode material. The method can increase the reversible specific capacity and the circulation stability of the cathode material.

Description

technical field [0001] The invention relates to a preparation method of a battery negative electrode material, in particular to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] Since anode materials have an important impact on the performance of lithium-ion batteries, their research and development has been extremely active. Among them, further improving the electrical properties of carbon materials is the main topic in the development of negative electrode materials. In addition to looking for initial raw materials with higher performance, the work in this area is also one of the important contents to improve and improve the performance of existing carbon anode materials. The electrical properties of carbon anode materials are determined by various factors such as its internal structure, particle morphology, and surface properties. Among them, the surface properties have an important impact on the first discharge eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 赵东辉周鹏伟戴涛
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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