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Silicon-carbon cathode material for lithium ion battery and manufacturing method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as separation and impact on battery cycle performance, and achieve simple preparation process, low raw material cost, Effect of high specific gram capacity

Active Publication Date: 2012-03-28
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based negative electrode materials have huge volume changes during the intercalation and deintercalation of lithium ions, and when the coating is improper or defective, the electrode active material will be separated from the current collector, which seriously affects the cycle performance of the battery.

Method used

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  • Silicon-carbon cathode material for lithium ion battery and manufacturing method thereof
  • Silicon-carbon cathode material for lithium ion battery and manufacturing method thereof
  • Silicon-carbon cathode material for lithium ion battery and manufacturing method thereof

Examples

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preparation example Construction

[0023] The preparation method of the silicon-carbon alloy negative electrode material that lithium-ion battery of the present invention is used comprises the following steps:

[0024] 1. According to the mass ratio, 5-95% of the nano-silicon powder with a particle size of 10-500nm, and 5-95% of the carbon material precursor of the coating layer, according to the mass ratio of the nano-silicon powder and the carbon material precursor to the solvent 1: 1-10, put into the solvent, rotate at 500-1500, stir for 1-3 hours to disperse evenly, dry the evenly dispersed slurry 1 according to the prior art until the solvent content is less than 1%, and obtain the compound 1.

[0025] The carbon material precursor is pitch, polyvinyl chloride, polyethylene, phenolic resin or stearic acid.

[0026] The solvent is more than one of water, alcohols, ketones, alkanes, esters, aromatics, N-methylpyrrolidone, dimethylamide, diethylformamide, dimethylsulfoxide and tetrahydrofuran .

[0027] 2. ...

Embodiment 1

[0040] 1. Weigh 10g of asphalt and 90g of nano-silicon powder with a particle size of 50-150nm into 100g of alcohol at a speed of 500 rpm, stir for 3 hours, and dry until the solvent content is less than 1%.

[0041] 2. At a heating rate of 10°C / min, until the heat treatment temperature does not exceed 750°C, keep the temperature for 10 hours, feed nitrogen with a purity of 99.9%, and a flow rate of 0.1L / min.M 3 .

[0042] 3. Pulverize the composite material after heat treatment, and the particle size range after pulverization is 5-50um.

[0043] 4. According to the mass ratio of 1:50, put the crushed silicon composite material into the reaction reagent for treatment, and the reaction reagent is HF and HNO 3 The acid solution has a molar concentration of 0.1 mol / L and 10 mol / L respectively, the treatment time is 30 min, and the temperature is 10°C. After the reaction is completed, the treated powder is washed with deionized water until the pH value of the solution is 6-8. A...

Embodiment 2

[0052] 1. Weigh 95g of polyvinyl chloride and 5g of nano-silicon powder with a particle size of 50-110nm into 300g of alcohol at a speed of 1500 rpm, stir for 1 hour, and dry until the solvent content is less than 1%.

[0053] 2. With a heating rate of 1°C / min, to the heat treatment temperature of 300°C, keep the temperature constant for 6 hours, and feed argon with a flow rate of 0.1L / min.M 3 .

[0054] 3. Pulverize the composite material after heat treatment, and the particle size range after pulverization is 5-50um.

[0055] 4. According to the mass ratio of 1:1, put the crushed silicon composite material into the reaction reagent for treatment, and the reaction reagent is HF and HNO 3 The acid solution has a molar concentration of 25 mol / L and 16 mol / L, the treatment time is 5 min, and the temperature is 10°C. After the reaction is completed, the treated powder is washed with deionized water until the pH value of the solution is neutral. After being dried until the wate...

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Abstract

The invention discloses a silicon-carbon cathode material for a lithium ion battery and a manufacturing method thereof, aiming at solving the technical problem of improving the circulating performance of the silicon-carbon cathode material. The silicon-carbon cathode material comprises a silicon-carbon composite material and graphite powder, and comprises the components by mass ratio as follows: 1-20% of nano-silicon powder, 1-40% of carbon material presoma and the balance of graphite powder. The preparing method of the invention comprises the following steps: mixing, thermal processing, smashing, removing silicon powder with defects at the wrapping layer, mixing, thermal processing and smashing the silicon powder, and mixing the silicon powder with the graphite powder. Compared with the prior art, the material has higher specific capacity, and has a better circulating performance than that of a common alloy cathode material; the specific capacity of the material is 400-1000mAh / g according to different technological parameters, and the capacity retention ratio of the material is maintained to be above 95% with 50 times of circulation; and the preparing process is simple, and the material cost is low, so that the method is applicable to mass production of high-capacity lithium ion battery cathode materials.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a silicon-carbon alloy negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, long service life, green and pollution-free, and low self-discharge. They have become the preferred power supply equipment for various portable electronic products and are inseparable from people's daily life. With the increasingly severe global environmental problems and the "low-carbon" lifestyle becoming more and more popular, the many advantages of lithium-ion batteries make lithium-ion batteries expected to become ideal power sources for portable electric tools and electric vehicles, and will also be used in play a more important role in human production and life. [0003] At present, the anode materials of commercialized lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38B82Y30/00B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 岳敏李胜侯贤华黄友元刘祥
Owner BTR NEW MATERIAL GRP CO LTD
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