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Nano silicon, preparation method thereof and application of nano silicon in silicon carbon composite cathode material and lithium ion battery

A negative electrode material, silicon-carbon composite technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of long time and high price of silicon nanomaterials, to improve electronic conductivity, reduce side reactions, and improve structural stability sexual effect

Inactive Publication Date: 2018-01-26
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silicon nanomaterials prepared by these techniques are often time-consuming and expensive, and more importantly, impurities such as silicon-magnesium alloys brought by high temperatures are difficult to separate from nano-silicon

Method used

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  • Nano silicon, preparation method thereof and application of nano silicon in silicon carbon composite cathode material and lithium ion battery
  • Nano silicon, preparation method thereof and application of nano silicon in silicon carbon composite cathode material and lithium ion battery
  • Nano silicon, preparation method thereof and application of nano silicon in silicon carbon composite cathode material and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0067] This embodiment provides a nano-silicon and a method for preparing a silicon-carbon composite negative electrode material for a lithium-ion battery using the nano-silicon as a silicon source:

[0068] Preparation of nano silicon:

[0069] (1) 5 parts by weight of AlCl 3 Mix with 2 parts by weight of magnesium powder and put it into a stainless steel pressure cooker, then take 1 part by weight of SiCl 4 Put it into a pressure cooker, and the above process is carried out in an environment full of nitrogen. Then the pressure cooker is immediately sealed and heated, and the temperature is raised to 400°C at a rate of 2°C / min for 6 hours. 4 Reduction is carried out to obtain a precipitate containing nano-silicon;

[0070] (2) Wash the precipitate cooled to room temperature with 0.1M hydrochloric acid, then wash with deionized water and ethanol, and finally soak the sample in diluted ethanol-solvented HF solution for 30min, and dry it in vacuum at 50°C to obtain a pure sil...

Embodiment 2

[0079] This embodiment provides a nano-silicon and a method for preparing a silicon-carbon composite negative electrode material for a lithium-ion battery using the nano-silicon as a silicon source:

[0080] Preparation of nano silicon:

[0081] (1) 5 parts by weight of AlCl 3 Mix with 3 parts by weight of sodium powder and put it into a stainless steel pressure cooker, then take 1 part by weight of SiO 2 Put it into a pressure cooker, and the above process is carried out in an environment full of nitrogen. Then the pressure cooker is immediately sealed and heated, and the temperature is raised to 200°C at a rate of 5°C / min for 10 hours. 2 Reduction is carried out to obtain a precipitate containing nano-silicon;

[0082] (2) Wash the precipitate cooled to room temperature with 0.2M hydrochloric acid, then wash with deionized water and ethanol, and finally soak the sample in diluted ethanol-solvented HF solution for 40min, and dry it in vacuum at 40°C to obtain a pure silico...

Embodiment 3

[0088] This embodiment provides a nano-silicon and a method for preparing a silicon-carbon composite negative electrode material for a lithium-ion battery using the nano-silicon as a silicon source:

[0089] Preparation of nano silicon:

[0090] (1) 6 parts by weight of AlCl 3 Mix it with 3 parts by weight of magnesium powder and put it into a stainless steel pressure cooker, then take 1.5 parts by weight of artificial glass fiber and put it into the pressure cooker. The above process is carried out in an environment full of nitrogen. Then the pressure cooker is immediately sealed and heated, and the temperature is raised to 300°C at a rate of 3°C / min for 8 hours. The magnesium powder reduces the artificial glass fiber to obtain a precipitate containing nano-silicon;

[0091] (2) Wash the precipitate cooled to room temperature with 0.15M hydrochloric acid, then wash with deionized water and ethanol, and finally soak the sample in diluted ethanol-solvented HF solution for 20mi...

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Abstract

The invention provides nano silicon, a preparation method thereof and an application of the nano silicon in a silicon carbon composite cathode material and a lithium ion battery. The invention provides a method for preparing the pure silicon component nano silicon by a low-temperature molten salt method, the obtained nano silicon is the secondary particles with a particle size being 80-120 nm formed by assembling the primary silicon particles, which is very suitable for preparing the silicon carbon composite cathode material, the silicon carbon composite cathode material is employed for preparing the silicon carbon material by a machinery fusion and high-temperature pyrolysis method, the electronic conductivity of the silicon material is improved, the volume effect generated during an alloying and dealloying process of the silicon cathode can be effectively buffered, and the structural stability of the material during a cycle process is increased. The silicon carbon cathode material has the advantages of high initial coulomb efficiency, good cycle performance, high compacted density, and stable electrode structure, and the preparation process of the nano silicon and the silicon carbon composite cathode material is environment friendly and pollution-free.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and relates to a nano-silicon, a preparation method and its application, in particular to a nano-silicon, a preparation method and its application in a silicon-carbon composite negative electrode material and a lithium-ion battery, and the use of the negative electrode materials for lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic devices and electric vehicles due to their advantages such as large specific energy, high working voltage, long cycle life, small size, light weight, and environmental protection. At present, the commercial lithium-ion battery anode material is mainly graphite, including natural graphite, artificial graphite, etc., but its theoretical specific capacity is only 372mAh / g, which is difficult to meet the demand for high energy density power supply in the application field...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王成云侯桃丽陈校军蒋新欣邓昊昆刘金成
Owner EVE ENERGY CO LTD
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