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Preparation method of nanometer silica-based material

A technology based on nano-silicon, which is applied in the field of energy storage research, can solve the problems of restricting the widespread use of silicon-based negative electrode materials, the high price of nano-silicon-based materials, and the difficulty of nano-level crushing, and achieves low preparation costs and easy large-scale Production, low stress relief effect

Active Publication Date: 2017-08-25
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the atoms of silicon-based materials are tightly bonded, it is difficult to crush at the nanometer level, the requirements for equipment are high, and the energy consumption is high, resulting in the high price of the prepared nano-silicon-based materials, which limits the wide use of silicon-based negative electrode materials.

Method used

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  • Preparation method of nanometer silica-based material

Examples

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Effect test

Embodiment 1

[0029] Step 1, alloy preparation: select elemental silicon with a particle diameter of 50 μm, metal lithium, and 1mol / L lithium hexafluorophosphate as the electrolyte and mix the lithium ion battery electrolyte evenly, and apply a pressure of 1 MPa to the mixture, and then fully react at 25°C. Lithium ions are intercalated into elemental silicon particles to obtain silicon-based alloy particles.

[0030] Step 2, crushing: in an inert atmosphere, the silicon-based alloy particles obtained in step 1 are subjected to high-pressure homogenization (ie, the particles are subjected to high-speed impact) treatment (same as the comparative example), to obtain crushed nano-sized silicon-based alloy particles.

[0031] Step 3, preparation of nano-silicon-based particles: Mix the nano-sized silicon-based alloy particles obtained in step 2 with a conductive agent to prepare an electrode, and assemble it with a lithium-ion battery electrolyte and a copper current collector as a counter elect...

Embodiment 2

[0033] The difference from Example 1 is that this example includes the following steps: In step 1, select elemental silicon with a particle diameter of 50 μm, metallic lithium, and 1 mol / L lithium hexafluorophosphate as electrolytes for lithium-ion batteries and mix them evenly, and mix the mixture evenly. Apply a pressure of 1MPa, and then fully react at 0°C, so that lithium ions are intercalated into elemental silicon particles to obtain silicon-based alloy particles.

[0034] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0036] The difference from Example 1 is that this example includes the following steps: In step 1, select elemental silicon with a particle diameter of 50 μm, metallic lithium, and 1 mol / L lithium hexafluorophosphate as electrolytes for lithium-ion batteries and mix them evenly, and mix the mixture evenly. Apply a pressure of 1 MPa, and then fully react at 60°C, so that lithium ions are intercalated into the elemental silicon particles to obtain silicon-based alloy particles.

[0037] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of research on energy storage, and particularly relates to a preparation method of a nanometer silica-based material. The method mainly comprises the steps of alloy preparation, crushing and preparation of nanometer particles. Through the alloy preparation process, the volume of the silica-based material is expanded, and cracks are formed in particles so as to facilitate particle breakage in the subsequent crushing process; through the process of the preparation of the nanometer particles, non-silica-based components in alloy can be removed so as to obtain the nanometer silica-based material.

Description

technical field [0001] The invention belongs to the field of energy storage research, in particular to a preparation method of a nano-silicon-based material. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth, and are widely used in various in portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: lighter weight, longer use time, etc. In order to solve the above problems, new electrode materials with better performance must be found. [0003] The current commercial lithium-ion battery anode material is mainly graphite, but its theoretical capacity is only 372mAh g -1 , can no longer meet the urgent needs of users. Therefore, the development of anode materials with higher specific capacity is imminent. As an anode material for lithium-ion batteries, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/386H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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