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A kind of preparation method of negative electrode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low coulomb efficiency and poor conductivity, and achieve improved conductivity, improved cycle performance, and improved first charge and discharge coulombs The effect of efficiency

Active Publication Date: 2018-10-30
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among silicon-based materials, silicon oxide is a research hotspot, but its first coulombic efficiency is low, and its electrical conductivity is extremely poor, and the electrical conductivity is in the range of insulators (<10-12S / cm)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of a lithium-ion battery negative electrode material provided in this example comprises the following steps: mixing artificial graphite waste fine powder with a particle size of 1 μm-15 μm, SiO particles with a particle size of 1 μm-30 μm, and sucrose at a ratio of 7:8: The mass ratio of 1 is mixed by ball milling to obtain the mixed powder, and then the mixed powder is mixed with urea, specifically, the urea is dissolved in water to obtain a urea solution with a concentration of 0.3mol / L, and then the mixed powder is added to the urea Surface adsorption is carried out in the solution, and the adsorption duration is 30 minutes. Ultrasonic disturbance is applied during the entire adsorption process. After the adsorption is completed, the mixed powder is taken out and the mixed powder is dried. The drying temperature is 60 ° C, and the drying duration is 1h to remove moisture, and then carry out high-temperature nitriding treatment under a nitrogen p...

Embodiment 2

[0027] The preparation method of a lithium-ion battery negative electrode material provided in this example comprises the following steps: mixing artificial graphite waste fine powder with a particle size of 1 μm-15 μm, SiO particles with a particle size of 2 μm-40 μm, and glucose at a ratio of 5:7: The mass ratio of 0.7 is mixed by ball milling to obtain a mixed powder, and then the mixed powder is mixed with melamine, specifically, the melamine is dissolved in water to obtain a melamine solution with a concentration of 0.1mol / L, and then the mixed powder is added to the melamine Surface adsorption is carried out in the solution, and the duration of adsorption is 1h. Stirring is applied during the entire adsorption process. After the adsorption is completed, the mixed powder is taken out and the mixed powder is dried. The drying temperature is 80°C, and the drying duration is 40min. , to remove moisture, and then perform high-temperature nitriding treatment under an argon gas ...

Embodiment 3

[0029]The preparation method of a lithium-ion battery negative electrode material provided in this embodiment comprises the following steps: artificial graphite waste fine powder with a particle size of 1 μm-15 μm, SiO particles with a particle size of 0.2 μm-20 μm, and citric acid according to 9: 4: The mass ratio of 0.9 is mixed by ball milling to obtain a mixed powder, and then the mixed powder is mixed with N-methylpyrrolidone, specifically, N-methylpyrrolidone is dissolved in water to obtain a concentration of 0.9mol / L N -Methylpyrrolidone solution, then the mixed powder is added to the N-methylpyrrolidone solution for surface adsorption, the duration of adsorption is 10min, ultrasonic disturbance is applied during the entire adsorption process, after the adsorption is completed, the mixed powder is taken out and treated The mixed powder is dried at a drying temperature of 70° C. and a drying duration of 40 minutes to remove moisture, and then high-temperature nitriding tr...

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Abstract

The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a preparation method for a negative electrode material of the lithium-ion battery. The preparation method comprises the steps of ball-milling fine powder of artificial graphite wastes, SiO particles and organic carbon sources, thus acquiring mixed powder; then mixing the mixed powder with nitrogen-containing compounds; and nitriding in the atmosphere of protective gases at high temperatures of 300-1200 DEG C, thus acquiring the negative electrode material of the lithium-ion battery. According to the preparation method provided by the invention, the artificial graphite wastes can be better utilized for recycling, oxygen-containing functional groups on the surfaces of the artificial graphite wastes can be removed by nitrogen treatment, and primary coulombic efficiency, cycling stability and reversible capacity of the artificial graphite wastes can be improved. In addition, due to the mixture of silicon monoxide and the artificial graphite, both advantages can be integrated and both disadvantages can be weakened, and then the negative electrode material of the lithium-ion battery with high coulombic efficiency, good cycling performance, high capacity, high power and relatively small expansion can be acquired for the first time via effective coverage.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material. Background technique [0002] In graphite crystals, carbon atoms in the same layer are sp2 hybridized to form covalent bonds, and each carbon atom is connected to three other atoms by three covalent bonds. Six carbon atoms form a hexagonal ring on the same plane, extending into a sheet structure. The distance between layers of graphite is relatively large, generally 340pm, and the bonding force between carbon atoms on the same layer is very strong. Strong, extremely difficult to destroy. Due to the above structural characteristics of graphite, it has high temperature resistance, electrical and thermal conductivity, lubricity and chemical stability, etc., so it is widely used as refractory materials (such as graphite crucible), conductive materials (such as carbon rods, graphite g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 晏荦周豪杰仰韻霖
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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