High-capacity lithium ion battery negative electrode material capable of being industrially produced

A lithium-ion battery and negative electrode material technology, applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of unsatisfactory cycle stability, rate performance and safety performance, and achieve high capacity and good cycle performance. Uniformity, avoiding the effect of high energy consumption

Pending Publication Date: 2020-08-21
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a silicon-carbon composite anode material with simple process route, low cost and suitable for large-scal

Method used

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  • High-capacity lithium ion battery negative electrode material capable of being industrially produced
  • High-capacity lithium ion battery negative electrode material capable of being industrially produced
  • High-capacity lithium ion battery negative electrode material capable of being industrially produced

Examples

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Example Embodiment

[0045] Example 1

[0046] A method for preparing an industrially produced high-capacity lithium ion battery negative electrode material includes the following steps:

[0047] (1) After washing and drying the micron grade industrial silicon powder with HCl, it is crushed by a crusher, and grading on a jet mill equipped with an air cyclone to obtain 2-3μm precursor silicon powder;

[0048] (2) Put the precursor silicon powder of step (1) in a calciner, raise the temperature to 950°C, and pass in a mixed gas of water vapor, oxygen and argon, with a water vapor content of 8% and an oxygen content of 2%. Calcined for 6 hours to prepare a composite powder of silicon oxide and silicon;

[0049] (3) Mix the prepared composite powder of silicon oxide and silicon with the artificial graphite matrix material in a mass ratio of 1:1 by a mechanical fusion machine for 3 hours to obtain a mixture powder;

[0050] (4) Then put the powder of step (3) and the coal-based medium temperature pitch with a m...

Example Embodiment

[0057] Example 2

[0058] A method for preparing an industrially produced high-capacity lithium ion battery negative electrode material includes the following steps:

[0059] (1) After washing and drying the micron grade industrial silicon powder with HCl, it is crushed by a crusher, and grading on a jet mill equipped with an air cyclone to obtain 2-3μm precursor silicon powder;

[0060] (2) Put the silicon powder precursor in a calcination furnace, raise the temperature to 950°C, pass in a mixed gas containing oxygen and nitrogen, with an oxygen content of 20%, and calcine for 10 hours to prepare a composite powder of silicon oxide and silicon;

[0061] (3) The prepared composite powder of silicon oxide and silicon is mixed with the artificial graphite matrix material in a mass ratio of 1:1 by a mechanical fusion machine for 3 hours to obtain a mixture powder

[0062] (4) Then put the powder of step (3) and the coal-based medium temperature pitch with a median particle size of 15-30 µm...

Example Embodiment

[0068] Example 3

[0069] A method for preparing an industrially produced high-capacity lithium ion battery negative electrode material includes the following steps:

[0070] (1) After washing and drying the micron grade industrial silicon powder with HCl, it is crushed by a crusher, and grading on a jet mill equipped with an air cyclone to obtain 2-3μm precursor silicon powder;

[0071] (2) Place the silicon powder precursor in a calcining furnace, raise the temperature to 800°C, pass in a mixed gas of water vapor and argon, with a water vapor content of 15%, and calcinate in an oxidizing atmosphere for 10 hours to prepare Obtain a composite powder of silicon oxide and silicon;

[0072] (3) Mix the prepared composite powder of silicon oxide and silicon with the artificial graphite matrix material in a mass ratio of 1:1 by a mechanical fusion machine for 3 hours to obtain a mixture powder;

[0073] (4) Then put the powder of step (3) and the phenolic resin with a median particle size o...

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Abstract

The invention provides a silicon-carbon composite negative electrode material, which is simple in process route, low in cost and suitable for large-scale industrial production. According to the invention, oxidizing is performed in an oxidizing atmosphere to prepare porous silicon particles, secondary embedding is performed, and system calculation and accurate control on oxidation and etching conditions are carried out to prepare a composite material with graphite as a matrix, porous structure silicon nanoparticles as a core body and a conductive carbon layer as a shell layer; and the technicalapplication problems of unsatisfactory cycling stability, rate capability and safety performance of a silicon-carbon composite material in the prior art are solved, and the composite material is suitable for industrial batch production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, in particular to a high-capacity lithium-ion battery negative electrode material that can be industrially produced. Background technique [0002] With the rapid development of electric vehicles and advanced electronic equipment, higher requirements are put forward for the energy density of lithium-ion batteries, and the energy density of lithium-ion batteries is increasing at a rate of 7-10% per year. However, at present, the anode materials of commercial lithium-ion batteries are still mainly graphite-based materials, which have a low theoretical specific capacity (only 372 mAh / g) and poor rate performance. In order to meet the energy demand of the new generation, it is imminent to develop new lithium-ion battery anode technology. Alloying reaction occurs between silicon and lithium, which has a high theoretical specific capacity (4200 mAh / g), a low voltage platfo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 韩飞刘金水项品峰汪卫斌
Owner HUNAN UNIV
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