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Silicon-carbon particles used in the cathode of lithium batteries

A technology of silicon carbon particles and carbon particles, which is applied in the field of silicon material preparation, can solve the problems of the collapse of the silicon anode structure, pulverization, and the inability to recycle waste materials, and achieves the effects of stable electrical contact, stable bonding and reuse.

Inactive Publication Date: 2019-01-08
山西中电科新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention overcomes the deficiencies of the prior art, solves the problem that waste materials cannot be recycled after slicing crystal silicon diamond wires in the photovoltaic industry, and provides a silicon-carbon particle for the negative electrode of lithium batteries prepared by cutting waste silicon powder with diamond wires, which can solve the problem of The structure collapse and pulverization of silicon negative electrode caused by lithium intercalation and delithiation of silicon negative electrode

Method used

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  • Silicon-carbon particles used in the cathode of lithium batteries

Examples

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Embodiment 1

[0044] The method for preparing lithium battery negative electrode material by diamond wire cutting waste silicon powder comprises the following steps:

[0045] 1) Remove the collected crystalline silicon diamond wire cutting waste silicon powder from metal, polyethylene glycol, glue, glass and other impurities remaining in the crystalline silicon diamond wire cutting waste silicon powder.

[0046] 2) Prepare mixed solution: use 0.3mol / L hydrochloric acid, 40% sulfuric acid and 45% nitric acid to prepare a mixed solution, wherein the volume ratio of hydrochloric acid, sulfuric acid, and nitric acid is 1:0.8:1; The temperature is 80°C.

[0047]3) Soak diamond wire cutting waste silicon powder in the mixed solution for 6 hours with vacuum stirring to remove metal copper, iron, nickel plasma and at the same time conduct preliminary corrosion on the surface of diamond wire cutting waste silicon powder particles, and then use Rinse 5 to 20 times with DI water and ethanol mixture b...

Embodiment 2

[0057] Such as image 3 As shown, the preparation method of the silicon-carbon particles is the same as in Example 1. The silicon-carbon particles used for the negative electrode of a lithium battery include spherical carbon particles 4 and spherical silicon particles 5, and the particle size of the silicon particles 5 is 50 mm. The particle size of the carbon particle 4 is 200nm, and the surface layer of the carbon particle 4 is connected with several silicon particles 5 ; the multiple silicon particles 5 wrap the surface of the carbon particle 4 . Among them, the spherical silicon particles 5 include a spherical elemental silicon inner core 1 , the surface of the spherical elemental silicon inner core 1 is covered with a silicon oxide outer layer 2 , and a plurality of holes 3 are distributed through the silicon oxide outer layer 2 . The radius ratio of the elemental silicon inner core 1 to the silicon oxide outer layer 2 is 1:1.5.

Embodiment 3

[0059] Such as Figure 4 As shown, the preparation method of the silicon-carbon particles is the same as in Example 1. The silicon-carbon particles used for the negative electrode of a lithium battery include spherical carbon particles 4 and spherical silicon particles 5, and the particle size of the silicon particles 5 is 30 mm. The particle size of the carbon particles 4 is 30nm, and the carbon particles 4 and the silicon particles 5 are alternately connected in the horizontal and vertical spaces. Among them, the spherical silicon particles 5 include a spherical elemental silicon inner core 1 , the surface of the spherical elemental silicon inner core 1 is covered with a silicon oxide outer layer 2 , and a plurality of holes 3 are distributed through the silicon oxide outer layer 2 . The ratio of the radii of the elemental silicon inner core 1 to the outer silicon oxide layer 2 is 1:1.3.

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Abstract

The invention discloses a silicon-carbon particle used for a negative electrode of a lithium battery, belonging to the technical field of silicon material preparation. Includes spherical carbon particles and spherical silicon particles, and the particle size ratio of silicon particles to carbon particles is 0.6-1: 4-6, a plurality of silicon particles are connected to the surface layer of the carbon particles; Wherein, the spherical silicon particles comprise a spherical simple silicon inner core, the surface of the spherical simple silicon inner core is coated with an outer silicon oxide layer, and a plurality of holes are penetrated and distributed on the outer silicon oxide layer; The silicon particle structure of the present invention, which is favorable for fully mixing with graphiteto form spherical structure, The spherical wrapping structure formed with carbon particles makes the combination of silicon particles and carbon particles more stable. During the charging and discharging process, the silicon-carbon particles formed on the current collector are not easy to peel off from the current collector and form new solid electrolyte layer, which improves the electrochemical performance of lithium batteries.

Description

technical field [0001] The invention belongs to the technical field of silicon material preparation, and in particular relates to silicon carbon particles used for negative electrodes of lithium batteries. Background technique [0002] Lithium-ion batteries are currently the most widely used energy storage cells in energy storage technology. Improving the energy storage density of cells is the goal pursued by the world. The improvement of cell energy density mainly depends on the development and progress of its positive and negative electrode materials. [0003] People generally use carbon-based negative electrode materials as negative electrode materials for lithium-ion batteries, but carbon-based negative electrode materials have low energy density (theoretical specific capacity is 372mAh / g, and the actual reversible specific capacity is 330mAh / g). Silicon is currently known as the lithium-ion battery anode material with the highest specific capacity (theoretical specific ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525C01B32/182
CPCH01M4/362H01M4/386H01M4/583H01M4/62H01M10/0525C01B32/182Y02E60/10
Inventor 张军彦吴洪坤周社柱薛巍王起飞
Owner 山西中电科新能源技术有限公司
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