Preparation method of Mg2Si/SiOx/C composite cathode material membrane electrode of lithium ion secondary battery

A technology for secondary batteries and negative electrode materials, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., to achieve the effects of convenient operation, strong reproducibility, and improved cycle performance

Active Publication Date: 2015-05-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development of high-capacity silicon anode materials is a long process. Current research shows that modification by different methods can reduce the irreversible capacity of the material to a certain extent and improve the cycle performance of the material, but compared with industrial graphite There is still a certain gap, which is also a common problem with high-capacity anode materials

Method used

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  • Preparation method of Mg2Si/SiOx/C composite cathode material membrane electrode of lithium ion secondary battery
  • Preparation method of Mg2Si/SiOx/C composite cathode material membrane electrode of lithium ion secondary battery
  • Preparation method of Mg2Si/SiOx/C composite cathode material membrane electrode of lithium ion secondary battery

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Experimental program
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Effect test

Embodiment 1

[0026] Put the foamed magnesium in water and wash it under ultrasonic conditions for 10 minutes, take it out and dry it for later use. Dissolve sucrose in water under heating conditions to adjust the viscosity of the slurry to 3000Pa·s, add silicon dioxide after it is completely dissolved, the amount of silicon dioxide added is 10 times the mass of sucrose, and at the same time add water to adjust the slurry under the condition of constant stirring The viscosity is 7000Pa·s. After adjustment, the slurry continued to stir and disperse for 4 hours, and then coated the treated foamed magnesium with a uniform slurry using a knife coater, and dried it in a vacuum drying oven at 120°C for 12 hours. The dried membrane precursor is rolled to 1 / 3 of the original thickness by a pair of rollers, and then put into a tube furnace for sintering under the protection of argon. Keep it warm for 2 hours, heat it up to 650°C for 12 hours, and cool it down to room temperature naturally to get Mg...

Embodiment 2

[0029] Put the foamed magnesium in water and wash it under ultrasonic conditions for 10 minutes, take it out and dry it for later use. Dissolve glucose in water under heating conditions to adjust the viscosity of the slurry to 4000Pa·s, add silicon monoxide after complete dissolution, the amount of silicon monoxide added is 15 times the mass of glucose, and add water to adjust the slurry under the condition of constant stirring The viscosity is 6000Pa·s. After the adjustment, the slurry was stirred and dispersed for 3 hours, and the uniform slurry was coated on the treated foamed magnesium with a knife coater, and dried in a vacuum drying oven at 120°C for 12 hours. The dried membrane precursor is rolled to 1 / 4 of the original thickness by a pair of rollers, put into a tube furnace for sintering under the protection of argon, and the sintering system is 3°C / min. Insulate for 2 hours, heat up to 600°C for 12 hours, and cool down to room temperature naturally to obtain Mg 2 Si...

Embodiment 3

[0032] Put the foamed magnesium in water and wash it under ultrasonic conditions for 10 minutes, take it out and dry it for later use. Dissolve the asphalt in acetone to adjust the viscosity of the slurry to 5000Pa·s, add silicon powder after completely dissolving, the amount of silicon powder added is 20 times the mass of the asphalt, and add acetone to adjust the viscosity of the slurry to 10000Pa·s under the condition of non-stop stirring . After the adjustment, the slurry was stirred and dispersed for 6 hours, and the uniform slurry was coated on the treated foamed magnesium with a knife coater, and dried in a vacuum drying oven at 120°C for 12 hours. The dried membrane precursor is rolled to 1 / 4 of the original thickness by a pair of rollers, put into a tube furnace for sintering under the protection of argon, and the sintering system is 3°C / min. Keep it warm for 2 hours, heat it up to 700°C for 12 hours, and cool it down to room temperature naturally to get Mg 2 Si / SiO...

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Abstract

The invention discloses a preparation method of an Mg2Si/SiOx/C composite cathode material membrane electrode of a lithium ion secondary battery. The preparation method comprises the steps of evenly dispersing silicon oxides or silicon powder into slurry of an organic carbon source in a mixing way; enabling a foam magnesium substrate to be evenly coated with the dispersed slurry by a blade coating machine, and drying; carrying out roll-tensioning treatment on the dried membrane electrode precursor; sintering under the protection of inert atmosphere, partly reducing the silicon oxides by utilizing the reducing property of metal and generating alloy to obtain the Mg2Si/SiOx/C composite cathode material membrane electrode, wherein all components in the composition have lithium-ion inserting activities under different potentials. The Mg2Si/SiOx/C composite cathode material membrane electrode prepared by the method is higher in capacity and good in cycle performance; the traditional crushing classification technology and electrode manufacturing technology of the solid phase synthesis material are omitted, a conductive metal foil substrate of a pole piece is omitted, and the sintered membrane can be directly taken as the electrode, so that the cost is lowered, and the synthetic process is simple and suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion secondary battery Mg 2 Si / SiO X The preparation method of / C composite negative electrode material membrane electrode. Background technique [0002] The rapid development of lithium-ion batteries depends on the development of new energy materials and the progress of comprehensive technologies. Among them, the exploration and research of new electrode materials, especially negative electrode materials, is particularly important. At present, most commercial negative electrode materials use graphite and other lithium-intercalated carbon materials as the negative electrode. Although compared with metal lithium, the cycle performance and safety performance have been greatly improved, but there is still passivation of the carbon surface during the first charge and discharge. The membrane causes the problem of large irreversible capacity loss. In addition, the potential of the carbon electrode is similar to that of l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/04
CPCH01M4/04H01M4/131H01M4/133H01M4/134H01M4/139H01M10/0525Y02E60/10
Inventor 王永志
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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