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Battery, negative electrode material and preparation method thereof

A negative electrode material and battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance and low electrical conductivity, and achieve the effect of improving electrical conductivity, high electrical conductivity, and improving electronic conductivity

Active Publication Date: 2016-08-24
四川金汇能新材料股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a negative electrode material with good cycle performance and high conductivity, a preparation method thereof, and a lithium ion battery made of the negative electrode material for the problems of poor cycle performance and low electrical conductivity of the lithium ion battery negative electrode material.

Method used

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  • Battery, negative electrode material and preparation method thereof
  • Battery, negative electrode material and preparation method thereof
  • Battery, negative electrode material and preparation method thereof

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preparation example Construction

[0028] The preparation method of the negative electrode material of the present invention includes the following steps:

[0029] (1) Configure silicon oxide (SiO x ): CO(NH 2 ) 2 :Metal salt molar ratio=30-100:3-15:1 mixed aqueous solution, and control the pH of the mixed solution to 1-6. Preferably, silicon oxide (SiO x The x value of) is 0.9-1.5, and the particle size of silicon oxide is 300nm-5000nm; preferably, the metal salt is: ferric chloride, cobalt chloride, nickel chloride, ferric sulfate, ferrous sulfate, cobalt sulfate, sulfuric acid Any one or more of nickel, iron nitrate, cobalt nitrate, nickel nitrate, nickel acetate and cobalt acetate; preferably, the reagents used to adjust the pH of the solution are hydrochloric acid solution, nitric acid solution, sulfuric acid solution, sodium hydroxide solution, Any one or more of potassium hydroxide solution and ammonia solution.

[0030] (2) Continue to stir and heat the mixed solution to any temperature of 50-150°C, and con...

Embodiment 1

[0038] (1) Take the average particle size (D50) of 0.8μm silicon oxide (SiO x , X = 1.05) 100g, 18.7g urea, 16.8g ferric chloride hexahydrate, were added to 190g deionized water, and adjusted pH to 2 with 1mol / L HCl solution;

[0039] (2) Heat the mixed solution of step (1) to 90°C while stirring, keep constant temperature and continue stirring until no bubbles are generated during the stirring process, stop stirring, and then filter the resulting dark red suspension under reduced pressure, and then The filter cake was repeatedly washed several times and then vacuum dried at 100°C for 5 hours to obtain 106.3 g of precursor a;

[0040] (3) Dissolve 210 g of water citric acid in 600 g of deionized water, then add the precursor a, and then sequentially perform ultrasonic dispersion and centrifugal spray drying under continuous stirring to obtain the precursor b. The feed rate of centrifugal spray drying is 3.5kg / h, the spray inlet temperature is 250°C, the outlet temperature is 100°C,...

Embodiment 2

[0043] (1) Take silicon oxide (SiO) with an average particle size (D50) of 2.3 μm x , X=1.10) 100g, 18.6g urea, 15.1g cobalt chloride hexahydrate, respectively added to 220g deionized water, and adjusted pH to 2 with 1mol / L HCl solution.

[0044] (2) Heat the mixed solution of step (1) to 100°C while stirring, keep stirring at constant temperature and continue stirring until no bubbles are generated during the stirring process, stop stirring, and then filter the obtained dark blue suspension under reduced pressure, and then The filter cake was repeatedly washed several times and vacuum dried at 100°C for 5 hours to obtain 105.3 g of precursor a.

[0045] (3) Dissolve 20 g of pitch in 400 g of tetrahydrofuran, then add the precursor a, and then sequentially perform ultrasonic dispersion and centrifugal spray drying under continuous stirring to obtain the precursor b. The feed rate of centrifugal spray drying is 3.1kg / h, the spray inlet temperature is 160°C, the outlet temperature is...

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Abstract

The invention discloses a preparation method of a negative electrode material. The preparation method comprises the following steps: (1) preparing a mixed aqueous solution at the ratio of SiOx to CO(NH2)2 to metal salt being (30-100):(3-15):1, and controlling the pH of the mixed aqueous solution to be 1-6; (2) stirring further and heating the mixed solution till reaching a certain temperature, stirring further at constant temperature until no generation of air bubbles, then filtering, cleaning and drying to obtain a precursor a; (3) adding the precursor a into a solution containing an organic carbon source, stirring further uniformly, and carrying out spray drying so as to prepare a precursor b formed by the precursor a on the surface of which the organic carbon source is distributed; and (4) storing the precursor b at the high temperature of 200-500 DEG C for 1-5 hours in an inert gas environment, and then heating to 700-1100 DEG C, and calcining for 1-10 hours so as to obtain the negative electrode material. The negative-electrode material prepared by the preparation method and a corresponding battery are good in cyclic performance, and are high in conductivity. The invention also provides the negative-electrode material prepared by the method and the battery prepared from the negative-electrode material.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, in particular to a double-shell structure negative electrode material, a preparation method thereof, and a lithium ion battery using the negative electrode material. Background technique [0002] Compared with the traditional graphite anode, silicon has an ultra-high theoretical specific capacity (4200mAh / g) and a lower delithiation potential ( <0.5V), and the voltage platform of silicon is slightly higher than that of graphite, it is difficult to cause lithium on the surface during charging, and the safety performance is better. Silicon has become one of the potential options for upgrading the carbon-based anode of lithium-ion batteries. [0003] However, silicon as a negative electrode material for lithium-ion batteries also has disadvantages. During the charging and discharging cycle, the insertion and extraction of lithium ions cause the volume of the material body to change by more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/386H01M4/48H01M4/624H01M4/625H01M10/0525Y02E60/10
Inventor 吴云胜何晓云石九菊吴泽轶匡春芳胡晓东蒋勇明郜长福
Owner 四川金汇能新材料股份有限公司
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