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A kind of negative electrode material of lithium battery and preparation method thereof

A negative electrode material, lithium battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as low capacity, poor cycle and rate performance, and improve charge-discharge specific capacity. , prolong the service life, avoid the effect of volume expansion

Active Publication Date: 2021-12-07
CHONGQING VOCATIONAL INST OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for its anode material, commercial graphite exhibits a very low capacity (375 mAh / g)
However, alloying reaction (Sn, P, SnO2, etc.), deintercalation mechanism (carbon materials), and conversion reaction (ZnO, CoS, etc.) type anode materials exhibit high capacity, but poor cycle and rate performance.

Method used

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  • A kind of negative electrode material of lithium battery and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0023] S1. Weigh by weight: 10 parts of lithium titanate powder, 20 parts of silica airgel, 10 parts of sulfur-doped graphene, 10 parts of carbon nanotubes, 20 parts of fluorosilicon modified acrylic emulsion, perfluoroalkane 3 parts of acrylate copolymer emulsion;

[0024] S2. ultrasonically disperse the weighed lithium titanate powder, sulfur-doped graphene, and carbon nanotubes in water, respectively, to form a lithium titanate suspension, a sulfur-doped graphene suspension, and a carbon nanotube suspension;

[0025] S3. Add silica airgel to the lithium titanate suspension, under stirring, after the silica airgel is completely absorbed, add sulfur-doped graphene suspension and carbon nanotube suspension, After the silica airgel is completely adsorbed, it is dried and calcined at 900-950°C for 3-4 hours under a nitrogen atmosphere to obtain a lithium intercalation active...

Embodiment 2

[0028] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0029] S1. Weigh by weight: 15 parts of lithium titanate powder, 30 parts of silica airgel, 15 parts of sulfur-doped graphene, 20 parts of carbon nanotubes, 30 parts of fluorosilicon modified acrylic emulsion, perfluoroalkane 7 parts of acrylate copolymer emulsion;

[0030] S2. ultrasonically disperse the weighed lithium titanate powder, sulfur-doped graphene, and carbon nanotubes in water, respectively, to form a lithium titanate suspension, a sulfur-doped graphene suspension, and a carbon nanotube suspension;

[0031] S3. Add silica airgel to the lithium titanate suspension, under stirring, after the silica airgel is completely absorbed, add sulfur-doped graphene suspension and carbon nanotube suspension, After the silica airgel is completely adsorbed, it is dried and calcined at 900-950°C for 3-4 hours under a nitrogen atmosphere to obtain a lithium intercalation active...

Embodiment 3

[0034] A preparation method of a lithium battery negative electrode material, comprising the steps of:

[0035] S1. Weigh by weight: 12.5 parts of lithium titanate powder, 25 parts of silica airgel, 12.5 parts of sulfur-doped graphene, 15 parts of carbon nanotubes, 25 parts of fluorosilicone modified acrylic emulsion, perfluoroalkane 5 parts of acrylate copolymer emulsion;

[0036] S2. ultrasonically disperse the weighed lithium titanate powder, sulfur-doped graphene, and carbon nanotubes in water, respectively, to form a lithium titanate suspension, a sulfur-doped graphene suspension, and a carbon nanotube suspension;

[0037] S3. Add silica airgel to the lithium titanate suspension, under stirring, after the silica airgel is completely absorbed, add sulfur-doped graphene suspension and carbon nanotube suspension, After the silica airgel is completely adsorbed, it is dried and calcined at 900-950°C for 3-4 hours under a nitrogen atmosphere to obtain a lithium intercalation a...

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Abstract

The invention discloses a lithium battery negative electrode material and a preparation method thereof, which are prepared from the following raw materials in parts by weight: 10-15 parts of lithium titanate powder, 20-30 parts of silica aerogel, and 10 parts of sulfur-doped graphene. -15 parts, 10-20 parts of carbon nanotubes, 20-30 parts of fluorosilicon modified acrylic emulsion, and 3-7 parts of perfluoroalkyl acrylate copolymer emulsion. The invention uses silica aerogel to wrap lithium titanate, and attaches a three-dimensional carbon structure composed of sulfur-doped graphene and carbon nanotubes on its surface, and contains abundant channels, which is easy for lithium ions to migrate and shuttle in the channels. , intercalation and extraction, greatly improve the charge-discharge specific capacity of lithium ions, and at the same time a large amount of internal space can effectively avoid the volume expansion of the negative electrode material, and the introduction of fluorosilicon modified acrylic emulsion and perfluoroalkyl acrylate copolymer emulsion can It can buffer and adjust the rapid intercalation and deintercalation of lithium ions and prolong the service life of the negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium battery material preparation, in particular to a lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Due to its high energy density, power density, long service life, and environmental friendliness, lithium-ion batteries have been widely used in mobile electronic products, and have become the power source of hybrid electric vehicles and pure electric vehicles. However, for its anode material, commercial graphite exhibits a very low capacity (375 mAh / g). On the other hand, alloying reaction (Sn, P, SnO2, etc.), deintercalation mechanism (carbon materials), and conversion reaction (ZnO, CoS, etc.) types of anode materials exhibit high capacity but poor cycle and rate performance. Therefore, it is urgent to find anode materials with excellent cycle stability, long lifetime and high rate capability. Contents of the invention [0003] In order to solve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/485H01M10/0525C04B35/624C04B35/14B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00C04B35/14C04B35/624C04B2235/3234C04B2235/422C04B2235/425C04B2235/6567H01M4/485H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 郭亚琴
Owner CHONGQING VOCATIONAL INST OF ENG