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Application of waste contact as lithium ion battery negative material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, battery recycling, circuits, etc., can solve problems such as unfavorable industrialization of lithium ion silicon-based negative electrode materials, damage to product coating structure, increase production costs, etc., and achieve raw material costs. Inexpensive, simple modification method, and the effect of enhancing electrical conductivity

Active Publication Date: 2012-08-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The silicon particles used in this type of method need to be specially prepared, some use a large amount of organic solvents, dispersants or binders, and most of the methods can only be completed at high temperatures and need to be crushed to destroy the coating structure of the product. Increase production costs and bring great inconvenience to industrial production, which is not conducive to the industrialization of lithium-ion silicon-based negative electrode materials

Method used

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  • Application of waste contact as lithium ion battery negative material
  • Application of waste contact as lithium ion battery negative material
  • Application of waste contact as lithium ion battery negative material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Wash 5g of the waste contacts produced in the process of preparing organosilicon monomer methylchlorosilane by the fluidized bed process commonly used in the organosilicon industry with 100mL of benzene and ethanol twice, filter and store in a vacuum drying oven at 100°C Vacuum-dried for 2 hours to obtain a silicon / carbon / copper porous composite used as a negative electrode material for a lithium-ion battery.

[0078] The surface morphology of the silicon / carbon / copper porous composite prepared above was observed with a JSM6700 field emission scanning electron microscope produced by Japan Electronics Corporation.

[0079] The silicon / carbon / copper porous composite prepared above was subjected to XRD test on an X'Pert PRO MPD multifunctional X-ray diffractometer produced by Panalytical Company (Panalytical) in the Netherlands.

[0080] The silicon / carbon / copper porous composite prepared above was analyzed for thermogravimetric changes on a Nippon Seiko TG / DTA6300 thermog...

Embodiment 2

[0087] After washing 5 g of the waste contact body produced in the process of preparing organosilicon monomer methylchlorosilane by the fluidized bed process commonly used in the organosilicon industry with 100mL nitric acid twice, almost all the metal components in the complex were dissolved and removed. Wash with distilled water for 5 times, and then vacuum dry at 150° C. for 2 hours in a vacuum drying oven to obtain a silicon / carbon porous composite negative electrode material for lithium ion batteries. The electrochemical performance test of the silicon / carbon porous composite negative electrode material is the same as that of Example 1, the initial reversible capacity is 1861mAh / g, and the reversible capacity retention rate is above 50% after 20 cycles.

[0088] Figure 4 The middle spectrum (b) is the XRD spectrum of the silicon / carbon porous composite obtained in Example 2. Compared with the pure silicon spectrum (c) of the raw material, it can be seen that the composit...

Embodiment 3

[0092] Put 5g of waste contacts produced during the preparation of organosilicon monomer methylchlorosilane by the fixed bed process commonly used in the organosilicon industry, and place them in a high-temperature furnace for calcination in air at a temperature of 600°C for 2 hours. After calcination Cool naturally to room temperature to obtain a silicon / copper oxide porous composite negative electrode material for lithium ion batteries. The electrochemical performance test of the silicon / copper oxide porous composite negative electrode material is the same as that of Example 1, the initial reversible capacity is 1867mAh / g, and the reversible capacity retention rate is above 20% after 20 cycles.

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Abstract

The invention relates to the field of battery materials, in particular to application of waste contact generated in a methyl chlorosilane preparation process as a lithium ion battery negative material. The waste contact is a silicon-based porous composite material, mainly comprises components of elementary substances, such as silicon, carbon and copper and further comprises trace metal elements such as zinc, iron, aluminum and tin. According to the invention, the waste contact is modified by the steps of acid washing, oxidizing, reducing, pyrolyzing, thermal treating and the like so as to improve the electrochemical performance, thereby finally obtaining the silicon-based porous composite material capable of serving as the lithium ion battery negative material. The silicon-based porous composite material has the advantages of low cost, simpleness in the modification method, high charging / discharging capacitiy and good cycle performance, and is suitable for the lithium ion battery negative material; in addition, the solid waste contact generated in an organic silicon synthesis industrial process is utilized to create high value.

Description

technical field [0001] The invention relates to the field of battery materials, in particular, the invention relates to the application of waste contacts produced during the preparation of organosilicon monomer methylchlorosilane as negative electrode materials for lithium ion batteries. Background technique [0002] Silicone materials have dual properties of inorganic materials and organic materials, high and low temperature resistance, electrical insulation, weather resistance, corrosion resistance, non-toxic and tasteless and other excellent properties, widely used in electronics, automobiles, petroleum, chemical, construction, aerospace and other fields . Methylchlorosilane is the most important organosilicon monomer and the most used organosilicon monomer in the preparation of organosilicon materials. It is the foundation and pillar of the entire organosilicon industry. Among them, the direct method of synthesizing methylchlorosilane based on fluidized bed reactor techn...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/38H01M4/134
CPCY02E60/10Y02W30/84
Inventor 苏发兵陈晗翟世辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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