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Method for preparing silicon oxide (SiOx) / carbon (C) composite materials and prepared silicon carbon cathode materials for lithium ion battery

A negative electrode material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of reducing the decomposition degree of electrolyte, and achieve the effect of improving electronic conductivity, broad market prospects, and high cycle efficiency

Inactive Publication Date: 2012-07-18
天津锦美碳材科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The traditional Si / C coating material is mostly a silicon-coated carbon layer. This carbon layer not only reduces the degree of decomposition of the electrolyte on the electrode surface, but also provides a continuous conductive layer for the active center silicon after lithium intercalation. This is what other Si / C composites lack

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  • Method for preparing silicon oxide (SiOx) / carbon (C) composite materials and prepared silicon carbon cathode materials for lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0029] According to the following ratios: the molar ratio of absolute ethanol, deionized water and ammonia water is 2:2:1, the molar ratio of tetraethyl orthosilicate and absolute ethanol is 1:3, nano silicon powder, tetraethyl orthosilicate and The molar ratio of ammonia water is 1:6:3, prepare two solutions of a and b respectively, mix and stir at constant temperature for 12 hours to obtain sol, wash with absolute ethanol, and centrifuge to obtain SiO x Microspheres. Add asphalt to pyridine at a mass volume ratio of 0.1 g / mL. Prepared SiO x The microspheres were slowly added to the organic solution of bitumen, SiO x The mass ratio of microspheres and asphalt is 4:1. React at 70°C for 3 hours and dry in air. Under the protection of nitrogen, the asphalt-coated SiO x The microspheres were placed in a tube furnace, heated to 800°C at a heating rate of 2°C / min, carbonized at a constant temperature for 3 hours, and cooled naturally to obtain SiO x / C material.

[0030] Pre...

Embodiment 2

[0032] According to the following ratios: the molar ratio of absolute ethanol, deionized water and ammonia water is 2:2:1, the molar ratio of tetraethyl orthosilicate and absolute ethanol is 1:3, nano silicon powder, tetraethyl orthosilicate and The molar ratio of ammonia water is 1:8:4, prepare two solutions of a and b respectively, mix and stir at constant temperature for 12 hours to obtain sol, wash with absolute ethanol, and centrifuge to obtain SiO x Microspheres. Add asphalt to pyridine at a mass volume ratio of 0.1 g / mL. Prepared SiO x The microspheres were slowly added to the organic solution of bitumen, SiO x The mass ratio of microspheres and asphalt is 4:1. React at 70°C for 3 hours and dry in air. Under the protection of nitrogen, the asphalt-coated SiO x The microspheres were placed in a tube furnace, heated to 800°C at a heating rate of 2°C / min, carbonized at a constant temperature for 3 hours, and cooled naturally to obtain SiO x / C material.

[0033] Pre...

Embodiment 3

[0035] According to the following ratios: the molar ratio of absolute ethanol, deionized water and ammonia water is 2:2:1, the molar ratio of tetraethyl orthosilicate and absolute ethanol is 1:3, nano silicon powder, tetraethyl orthosilicate and The molar ratio of ammonia water is 1:6:3, prepare two solutions of a and b respectively, mix and stir at constant temperature for 12 hours to obtain sol, wash with absolute ethanol, and centrifuge to obtain SiO x Microspheres. Add asphalt to pyridine at a mass volume ratio of 0.1 g / mL. Prepared SiO x The microspheres were slowly added to the organic solution of bitumen, SiO x The mass ratio of microspheres and asphalt is 1:1. React at 70°C for 3 hours and dry in air. Under the protection of nitrogen, the asphalt-coated SiO xThe microspheres were placed in a tube furnace, heated to 800°C at a heating rate of 2°C / min, carbonized at a constant temperature for 3 hours, and cooled naturally to obtain SiO x / C material.

[0036] Prep...

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Abstract

The invention discloses a method for preparing silicon carbon cathode materials for lithium ion battery. The method includes synthesizing silicon oxide micro-spheres (SiOx micro-spheres), and then sequentially mixing, coating and carbonizing the SiOx micro-spheres and the pitch solution. The method for preparing silicon oxide (SiOx) / carbon (C) composite materials and the prepared silicon carbon cathode materials for lithium ion battery also disclose the silicon carbon cathode materials for lithium ion battery, the materials for lithium ion battery are prepared by mixing the SiOx micro-spheres / C micro-spheres with artificial graphite. According to the method for preparing silicon oxide (SiOx) / carbon (C) composite materials, the rate of decay of the silicon carbon cathode materials is effectively prolonged, the circulation performance of the silicon carbon cathode materials is improved and the first circulation efficiency of the silicon carbon cathode materials is increased.

Description

technical field [0001] The invention relates to a preparation method of a battery negative electrode material and the prepared negative electrode material, in particular to a preparation method of a lithium ion battery negative electrode material and a silicon carbon negative electrode material prepared by the method. Background technique [0002] Graphite material has good structure and stable cycle efficiency. It is an ideal lithium-ion battery anode material and has been widely used in the production of lithium-ion batteries. But its main disadvantage is that the lithium storage capacity is limited, the theoretical specific capacity is 372mAh / g, and the high-current charge and discharge performance is poor, and there are many problems in high-rate power batteries. The latest research has found that Si, Al, Sn, Ag and other metals and their alloy materials that can be alloyed with Li have a much higher reversible lithium storage capacity than graphite anode materials. Amo...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 臧文平张勇赵旭
Owner 天津锦美碳材科技发展有限公司
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