Chip-like silicon particles used in the cathode of lithium batteries

A lithium battery and sheet-like technology, applied in the field of silicon material preparation, can solve the problems such as the inability to recycle waste, pulverization, and collapse of the silicon anode structure, and achieve the effects of realizing reuse, reducing side reactions, and alleviating volume effects.

Active Publication Date: 2019-01-04
山西中电科新能源技术有限公司
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  • 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 flaky silicon particle for negative electrodes 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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  • Chip-like silicon particles used in the cathode of lithium batteries

Examples

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Embodiment 1

[0030] The method for preparing lithium battery negative electrode material by diamond wire cutting waste silicon powder comprises the following steps:

[0031] 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.

[0032] 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.

[0033] 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 ...

Embodiment 2

[0041] The preparation method of the silicon particles is the same as that in Example 1. The silicon particles include a flaky elemental silicon inner core 1, and the upper and lower surfaces of the flaky elemental silicon inner core 1 have a silicon oxide outer layer 2. The silicon oxide outer layer A plurality of holes 3 are distributed through the layer 2 . The thickness of the flaky silicon particles is 50 nm. The thickness ratio of the elemental silicon inner core 1 to the silicon oxide outer layer 2 is 2.5:1.

Embodiment 3

[0043]The preparation method of the silicon particles is the same as that in Example 1. The silicon particles include a flaky elemental silicon inner core 1, and the upper and lower surfaces of the flaky elemental silicon inner core 1 have a silicon oxide outer layer 2. The silicon oxide outer layer A plurality of holes 3 are distributed through the layer 2 . The thickness of the flaky silicon particles is 30nm. The thickness ratio of the elemental silicon inner core 1 to the silicon oxide outer layer 2 is 2:1. A plurality of holes 3 are uniformly distributed in the silicon oxide outer layer 2 .

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Abstract

The invention discloses a chip-like silicon particle used for a negative electrode of a lithium battery, belonging to the technical field of silicon material preparation. Comprises a sheet-like simplesilicon inner core, wherein the upper and lower surfaces of the sheet-like simple silicon inner core are provided with an outer silicon oxide layer, and a plurality of holes are penetrated and distributed on the outer silicon oxide layer; The silicon granule structure of the invention is favorable for fully mixing with graphite to form branched and network structure, is favorable for alleviatingthe volume effect of silicon, meets the requirements of silicon material in the silicon-carbon negative electrode of lithium battery, realizes the reuse of diamond wire cutting waste, and realizes great economic benefit.

Description

technical field [0001] The invention belongs to the technical field of silicon material preparation, and in particular relates to flaky silicon 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/628H01M10/0525B82Y30/00Y02E60/10
Inventor 杜海文张军彦周社柱张瑾薛巍
Owner 山西中电科新能源技术有限公司
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