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A kind of preparation method of the lithium ion battery silicon negative pole of a kind of multilevel structure

A lithium-ion battery, silicon negative electrode technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve the problems of silicon active particle fragmentation, pulverization, and large specific surface area

Active Publication Date: 2020-10-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nanotechnology has received extensive attention in silicon anodes and has achieved excellent research results, but the application of nanotechnology in silicon anodes will lead to the following problems: 1) The specific surface area is large, resulting in a large consumption of limited lithium sources
However, silicon active particles with a size in the micron range generally suffer from fragmentation and pulverization during charge and discharge, which severely restricts their cycle stability.

Method used

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  • A kind of preparation method of the lithium ion battery silicon negative pole of a kind of multilevel structure
  • A kind of preparation method of the lithium ion battery silicon negative pole of a kind of multilevel structure
  • A kind of preparation method of the lithium ion battery silicon negative pole of a kind of multilevel structure

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Experimental program
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Effect test

Embodiment 1

[0033] This embodiment provides a multi-level structure of high volume performance lithium ion battery micron silicon anode and a preparation method thereof, which at least include the following steps:

[0034] In the first step, 200 mg of micron silicon powder and 800 mg of sublimed sulfur are ground and mixed uniformly, and then placed in a tube furnace for heat treatment at 155°C under an inert atmosphere for 6 hours;

[0035] In the second step, add the powder obtained in the first step together with 500 mg of dopamine and 40 g of ferric nitrate nonahydrate to 250 mL of Tris-HCl buffer solution with pH=8.5, and react at room temperature for 24 hours with sufficient stirring;

[0036] In the third step, the product to be processed obtained in the second step is centrifuged to obtain a solid, and 90 mL of graphene oxide dispersion with a concentration of 2 mg / mL is added, and the mixture is stirred alternately and sonicated for 30 minutes to fully mix. Afterwards, the mixed dispers...

Embodiment 2

[0042] The difference from Example 1 is:

[0043] The amount of micron silicon is adjusted to 300 mg, and the amount of sublimed sulfur is adjusted to 700 mg, and the rest is the same as in Example 1, which will not be repeated here. The bulk density of the graphene / silicon composite material is 1.4g / cm 3 , The silicon content is 63%.

Embodiment 3

[0045] The difference from Example 1 is:

[0046] The amount of micron silicon is adjusted to 400 mg, and the amount of sublimed sulfur is adjusted to 600 mg, and the rest is the same as in Example 1, which will not be repeated here. The bulk density of the graphene / silicon composite material is 1.5g / cm 3 , The silicon content is 66%.

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Abstract

The invention belongs to the technical field of lithium ion batteries and particularly relates to a preparation method of a silicon negative electrode of a multilevel structure for a lithium ion battery, which comprises the following steps: micron silicon particles and sublimed sulfur are ground, uniformly mixed and then are placed in a tubular furnace to be subjected to heat treatment, and a layer of sulfur is uniformly coated on the surface of the silicon particles; the silicon particles with dopamine and ferric salt are added into a buffer solution together, the dopamine is polymerized on the surfaces of the composite powder particles under the condition of sufficient stirring, and iron ions are carried; the solid and the graphene oxide obtained after separation are prepared through a hydrothermal reduction method to obtain composite gel; after being washed and dried, high-temperature heat treatment is carried out on the composite gel in the tubular furnace; the composite gel is soaked and washed with diluted hydrochloric acid, and dried to obtain the graphene / silicon composite material. According to the preparation method in the invention, the first coulombic efficiency of theelectrode material is improved by designing an egg yolk shell structure, and the cycling stability is improved; meanwhile, the density of the egg yolk shell structure is realized by utilizing a graphene three-dimensional assembly; and finally, the silicon negative electrode of the multilevel structure for the lithium ion battery is obtained.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a silicon negative electrode for a lithium ion battery with a multi-level structure. Background technique [0002] As the most potential next-generation high-energy density lithium-ion battery anode material, silicon has abundant reserves and has a mass specific capacity ten times that of graphite. The current research on silicon anode is in mass specific capacity (> 1000mAh g -1 ) And cycle performance (> 500 laps), great progress has been made in research on rate performance. However, the above performance is often improved by reducing the size of silicon active particles, that is, using nano silicon as an active material to construct a negative electrode material. Nanotechnology has received extensive attention in silicon anodes and has achieved excellent research results. However, the application of nanotechnology in silicon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 杨全红陈凡奇韩俊伟肖菁张辰陶莹
Owner TIANJIN UNIV
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