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A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery, negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, negative electrodes, etc., can solve problems such as poor cycle performance, achieve high specific capacity, suppress volume changes, charge The effect of high discharge efficiency

Active Publication Date: 2022-04-29
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have improved the cycle performance of silicon materials and silicon composites to a certain extent, but the capacity fading is still obvious, and the cycle performance after modification is poor.

Method used

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  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof
  • A kind of silicon carbon negative electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment １

[0028] 1. Preparation of silicon carbon anode material:

[0029] Prepare 500 mL of 0.1% carboxymethyl cellulose aqueous solution, add 3 g of sucrose, and stir evenly; then add 3 g of silicon powder to prepare a suspension, mechanically stir at 100 r / min for 1 hour, then ultrasonically disperse for 0.5 hour, and then disperse at 200 r / min Stir mechanically at a rotating speed for 12 hours to prepare a suspension.

[0030] The above suspension was transferred to a sand mill, and sand milled for 0.5 hour, and the speed of the sand mill was 1200r / min.

[0031] Add 2 mL of polyethylene glycol as a dispersant to the sanded suspension, and stir until uniform; then spray dry while stirring to obtain a black powder. The temperature is 80°C, the feed rate is 10mL / min, and the pressure is 0.05Mpa.

[0032] The black powder was calcined at 500° C. for 2 hours under an argon atmosphere to obtain a silicon-carbon negative electrode material with a ring structure.

[0033] 2. Test the sil...

Embodiment 2

[0040] 1. Preparation of silicon carbon anode material:

[0041] Prepare 500 mL of 2% carboxymethyl cellulose aqueous solution, add 10 g of sucrose, and stir evenly; then add 20 g of silicon powder to prepare a suspension, mechanically stir at 100 r / min for 1 hour, then ultrasonically disperse for 0.5 hour, and then disperse at 200 r / min Stir mechanically at a rotating speed for 12 hours to prepare a suspension.

[0042] The above-mentioned suspension was transferred to a sand mill, and sand milled for 5 hours, and the speed of the sand mill was 2000r / min.

[0043] Add 20 mL of dispersant methyl amyl alcohol to the sand-milled suspension, and mechanically stir until uniform; then spray-dry while stirring. The speed is 2mL / min, the pressure is 0.4Mpa, and a black powder is obtained.

[0044] Dissolve 0.5g of sucrose in water to prepare a secondary carbon source solution, disperse the black powder prepared above in the secondary carbon source solution, dry in vacuum at 60°C, a...

Embodiment 3

[0050] 1. Preparation of silicon carbon anode material:

[0051] Prepare 500 mL of 0.01% carboxymethyl cellulose aqueous solution, add 8 g of sucrose, and stir evenly; then add 5 g of silicon powder to prepare a suspension, mechanically stir at 100 r / min for 1 hour, then ultrasonically disperse for 0.5 hour, and then disperse at 200 r / min Stir mechanically at a rotating speed for 12 hours to prepare a suspension.

[0052] The above-mentioned suspension was transferred to a sand mill, and sand milled for 1 hour, and the speed of the sand mill was 1500r / min.

[0053] Add 3 mL of dispersant polyacrylic acid to the sand-milled suspension, and stir until uniform; then spray-dry while stirring. The air inlet temperature during spraying is 120°C, the outlet air temperature is 80°C, and the feed rate is 8mL / min, the pressure is 0.2Mpa, and black powder is obtained.

[0054] Dissolve 5g of glucose in water to prepare a secondary carbon source solution, disperse the black powder prepa...

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Abstract

The invention discloses a silicon-carbon negative electrode material for lithium-ion batteries, which has a ring structure with an outer diameter of 2-15 μm and an inner diameter of 0.5-5 μm; Agglomerated silicon particles. The invention also discloses a preparation method of the material, comprising: step 1: preparing a polymer solution; step 2: adding an organic carbon source to the polymer solution; step 3: adding silicon powder to the polymer solution to prepare a suspension; Step 4: transfer the suspension to a sand mill for sand grinding; Step 5: add a dispersant to the sand-milled suspension and stir evenly; spray dry to obtain a black powder; Step 6: dry the black powder in an argon atmosphere heat treatment. The hollow ring structure of the lithium ion negative electrode silicon carbon material with a ring structure of the present invention solves the problem of capacity attenuation caused by volume expansion in the cycle process, and has high initial charge and discharge efficiency, high specific capacity, and stable cycle performance.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion battery, in particular to a silicon carbon negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, and environmental friendliness. At present, they have been widely used in portable electronic products and electric tools, and are expected to become the future hybrid electric vehicles and pure electric vehicles. One of the main energy sources for power vehicles. The performance of negative electrode materials is one of the key factors affecting the comprehensive performance of lithium-ion batteries. At present, graphite is the most commonly used negative electrode material for lithium-ion batteries, which has the advantages of low price, abundant resources and good kinetic performance....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/583H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 杨书廷张芬丽郑延辉董红玉
Owner 河南电池研究院有限公司
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