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Method for modifying anode active material of lithium ion battery

A positive active material, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as instability, uneven distribution of coating film thickness, uneven flow field, etc., to avoid being Oxidation, avoid side reactions, improve overall performance

Inactive Publication Date: 2010-12-08
东营亿德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this method to prepare positive active materials, due to the inhomogeneous and unstable flow field of stirring and mixing during processing, the difficulty in controlling the mixing time, and the lack of cleaning or insufficient cleaning or excessive cleaning after mixing, each positive active material will The local environment of the particles is inconsistent, so there are problems such as the thickness of the coating film and the uneven distribution of the coating film, which greatly restricts the improvement space of the performance of lithium-ion batteries

Method used

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  • Method for modifying anode active material of lithium ion battery
  • Method for modifying anode active material of lithium ion battery
  • Method for modifying anode active material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0022] Add 485g LiCoO to 1L of deionized water and ethanol mixed solution 2and 7.6g ZrOCl, stir well; add ammonia water dropwise to adjust the pH value of the mixture to 7, and stir and mix for 2 hours; use a centrifugal device with an aperture of 800 mesh and an inner diameter of 1200mm to fully centrifuge for 3 hours; wash and centrifuge repeatedly with deionized water Mixture until the pH value of the flushing solution reaches 5; then dry at a constant temperature of 200°C for 2 hours under the protection of argon; and bake at 800°C for 5 hours, and slowly cool to room temperature to obtain a coating with a coating amount of about 1%. Coated positive electrode active material.

[0023] like figure 1 As shown, the sample prepared by the above method is imaged under the SEM microscope as figure 1 B, D in ; the material obtained by stirring only during the solid-liquid separation of the mixture without centrifugation is imaged under SEM as in A, C in 1. It is confirmed by t...

Embodiment 2

[0026] Add 520g LiNi in 2L deionized water 1 / 3 co 1 / 3 mn 1 / 3 o 2 and 10.3gAl(NO 3 ) 3 Stir evenly; add 0.5M ammonia water dropwise to adjust the pH value of the mixture to 6.5, and use a centrifugal device with a pore size of 600 mesh and an inner diameter of 700 mm to fully centrifuge for 1.5 hours; repeatedly rinse the centrifuged mixture with deionized water until the pH of the washing solution value is 6, and then dried at a constant temperature of 180° C. for 3 hours under the protection of nitrogen; and baked at 1000° C. for 5 hours, and slowly cooled to room temperature to obtain a coated positive electrode active material with a coating amount of about 0.25%.

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Abstract

The invention relates to a method for modifying an anode active material of a lithium ion battery, comprising the following steps of: stirring and mixing hydrolysis liquid of salt compounds containing metal elements with the anode active material for over one hour, and adjusting the pH value of a mixture to be 2-10; then removing a solution by centrifugation in a centrifugal machine and flushing the anode active material with a water-soluble liquid until the pH value of the flushing liquid is between 1 and 7; drying and sintering the flushed anode active material in the presence protective gases; removing an excessive solution and hydrolysate of metal ions by centrifugal treatment to avoid metallic oxide from being locally deposited on the surface of the active material and uniformly redistribute the metal oxide on the surface of the active material; and flushing the active material with a hydrophilic substance, thereby avoiding other materials from being resided on the surface of theactive material, further avoiding the side effect of the lithium ion battery and improving the overall performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for modifying positive electrode active materials of the lithium ion battery. Background technique [0002] A lithium-ion battery consists of a positive electrode, a negative electrode, a separator between the positive and negative electrodes, and an electrolyte. The positive and negative electrodes are composed of two different lithium ion intercalation compounds, relying on the difference in lithium ion concentration between the two electrodes to realize electron conduction and discharge to the outside. Lithium-ion batteries have high operating voltage (3.6V, three times that of cadmium-nickel and hydrogen-nickel batteries), small size (30% smaller than hydrogen-nickel batteries), and light weight (50% lighter than hydrogen-nickel batteries) , High specific energy (140Wh / kg, 2 to 3 times that of cadmium-nickel battery, 1 to 2 times that of hydrogen-nickel battery), no memory e...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 白洁明
Owner 东营亿德新材料有限公司
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