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Pre-lithiated silicon monoxide/carbon composite material, and preparation method and application thereof

A carbon composite material and silicon oxide technology, which is applied in electrochemical generators, active material electrodes, electrical components, etc., can solve the problem that the degree and uniformity of pre-lithiation are difficult to control, and are not suitable for large-scale industrial production and preparation technology. complex problems, to achieve the effect of improving electrochemical performance, facilitating production operations, and uniform carbon layer

Inactive Publication Date: 2021-01-29
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its preparation conditions are harsh and need to be carried out under anaerobic conditions. In addition, lithium metal has the disadvantage of uneven contact during the contact process with electrode pole pieces, and it is difficult to control the degree and uniformity of pre-lithiation.
[0006] The Chinese invention patent with the application publication number CN107093730B discloses a method of replenishing lithium to negative electrode materials using electrochemical principles, but its preparation process is complicated and difficult to scale up, and it is not suitable for large-scale industrial production

Method used

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  • Pre-lithiated silicon monoxide/carbon composite material, and preparation method and application thereof
  • Pre-lithiated silicon monoxide/carbon composite material, and preparation method and application thereof
  • Pre-lithiated silicon monoxide/carbon composite material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0035] A preparation and application of a pre-lithiated silicon oxide / carbon composite material, comprising the following steps:

[0036] 1) Weigh 2 kg of 5-micron silicon oxide and place it in a rotary kiln, raise the temperature to 800°C, feed acetylene gas at a flow rate of 100 L / h, and heat-preserve for 2 hours to obtain a silicon oxide / carbon composite material.

[0037] 2) Pulverize and sieve the lithium hydride. The median particle size after pulverization is 2 microns. 200g of the pulverized lithium hydride and 1800g of silicon oxide / carbon composite material are mixed with VC, and mixed uniformly to obtain a calcined material.

[0038] 3) Put the pre-fired material obtained in step 2 in the kiln, feed the mixed gas of hydrogen (100L / h) / argon (50L / h), raise the temperature to 650°C at 5°C / min, and keep it warm for 5h to obtain the pre-calcined Lithiated silicon oxide composites.

Embodiment 2

[0040] A preparation and application of a pre-lithiated silicon oxide / carbon composite material, comprising the following steps:

[0041] 1) Weigh 2 kg of 5-micron silicon dioxide and place it in a rotary kiln, raise the temperature to 800 ° C, feed acetylene gas at a flow rate of 200 L / h, and heat-preserve for 2 hours to obtain a silicon oxide / carbon composite material.

[0042] 2) Crushing and sieving lithium hydride, the median particle size of which is 2 microns after pulverization, VC mixing of 200 g of pulverized lithium hydroxide and 1500 g of silicon oxide / carbon composite material, and mixing uniformly to obtain a calcined material.

[0043]3) Put the pre-fired material obtained in the second step in the kiln, feed the mixed gas of hydrogen (50L / h) / argon (50L / h), raise the temperature to 650°C at 5°C / min, keep it for 5h, and obtain the pre-calcined Lithiated silicon oxide composite.

Embodiment 3

[0045] A preparation and application of a pre-lithiated silicon oxide / carbon composite material, comprising the following steps:

[0046] 1) Weigh 2kg of 5 micron silicon oxide and place it in a rotary kiln, raise the temperature to 900°C, feed acetylene gas at a flow rate of 200L / h, and heat-preserve for 2 hours to obtain a silicon oxide / carbon composite material.

[0047] 2) Pulverize and sieve the lithium hydride. The median particle size after pulverization is 2 microns. 200 g of the pulverized lithium hydride and 400 g of silicon oxide / carbon composite material are mixed with VC, and mixed uniformly to obtain a calcined material.

[0048] 3) Put the pre-fired material obtained in the second step in the kiln, feed the mixed gas of hydrogen (50L / h) / argon (50L / h), raise the temperature to 700°C at 5°C / min, keep it for 5h, and obtain the pre-calcined Lithiated silicon oxide composite.

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Abstract

The invention discloses a pre-lithiated silicon monoxide / carbon composite material, and a preparation method and application thereof, and belongs to the technical field of silicon monoxide materials.The preparation method comprises the following steps: performing vapor deposition on a silicon monoxide material to coat a carbon layer to prepare a silicon monoxide / carbon composite material; crushing a lithium salt to a proper particle size, and uniformly mixing the crushed lithium salt with silicon monoxide / carbon; and heating the mixed material to a certain temperature, and keeping the temperature for a period of time in a reducing atmosphere to obtain the pre-lithiated silicon monoxide / carbon composite material. According to the present invention, with the simple and efficient preparationmethod, a negative electrode material with characteristics of high first effect and good cycle performance can be effectively prepared, the negative electrode material can be well used for preparingthe lithium ion battery negative electrode material, and the method has advantages of low cost and easy scale-up production compared to the lithium supplementing through the metal lithium.

Description

technical field [0001] The invention belongs to the technical field of silicon oxide materials, and relates to a pre-lithiated silicon oxide / carbon composite material and a preparation method and application thereof. Background technique [0002] Silicon oxide is a silicon-based negative electrode material that has received wide attention in recent years, and it has a high mass specific capacity (2600mA·h·g -1 ), which is cheap and easy to obtain, is an ideal negative electrode material, but due to the formation of irreversible lithium silicate salt during the first cycle of silicon oxide, the first coulombic efficiency is low, and at the same time, the material itself is low. The electrical conductivity and high volume expansion effect severely limit the practical application of silicon oxide anodes. To address these defects, the preparation of silicon oxide / carbon composites is an effective method. [0003] The reversible specific capacity of silicon oxide is about 1500mA...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 薛孟尧胥鑫杨时峰曹新龙霍林智王凯锋
Owner SHAANXI COAL & CHEM TECH INST
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