Silicon-layered titanium carbide cathode material and preparation method thereof

A negative electrode material, titanium carbide technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., to achieve the effect of strong operability, simple process steps, and small volume effect

Inactive Publication Date: 2019-08-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the significant volume effect of the silicon material during charge and discharge, when the silicon content in the silicon-carbon composite material is high (>20%), the stress ca

Method used

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  • Silicon-layered titanium carbide cathode material and preparation method thereof
  • Silicon-layered titanium carbide cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0019] Example 1

[0020] The method for preparing the silicon-layered titanium carbide anode material provided by the present invention includes the following steps:

[0021] S1, weigh Ti 3 AlC 2 10g of powder, add 100g of HF solution with a mass concentration of 40%, and stir for 48 hours for etching to obtain Ti 3 C 2 The suspension of Ti 3 C 2 Filtration and drying of the suspension to obtain layered titanium carbide;

[0022] S2. Add nano silicon particles and layered titanium carbide into ethanol at a weight ratio of 20:80, ultrasonically disperse for 30 minutes to obtain a slurry, filter the obtained slurry, and then dry at 60°C for 24 hours to obtain the silicon-layer Shaped titanium carbide anode material.

[0023] figure 1 It is a schematic diagram of the structure of the silicon-layered titanium carbide anode material in Example 1 of the present invention; figure 1 It can be seen that in the silicon-layered titanium carbide anode material, nano-silicon particles are dispers...

Example Embodiment

[0027] Example 2

[0028] The method for preparing the silicon-layered titanium carbide anode material provided by the present invention includes the following steps:

[0029] S1, weigh Ti 3 AlC 2 Add 10g of powder to 150g of HF solution with a mass concentration of 20% and stir for 72 hours to prepare a layered titanium carbide suspension; then filter and dry the layered titanium carbide suspension to obtain layered titanium carbide;

[0030] S2. The nano-silicon particles and layered titanium carbide are added to ethanol at a weight ratio of 5:95, ultrasonically dispersed for 5 minutes, suction filtered, and then dried at 105°C for 4 hours to obtain the silicon-layered titanium carbide anode material.

Example Embodiment

[0031] Example 3

[0032] A silicon-layered titanium carbide anode material proposed by the present invention includes silicon particles and layered titanium carbide, and the silicon particles are uniformly distributed on the surface and between the lamellae of the layered titanium carbide.

[0033] The method for preparing the silicon-layered titanium carbide anode material provided by the present invention includes the following steps:

[0034] S1, weigh Ti 3 SiC 2 10g of powder, add 100g of HF solution with a mass concentration of 50%, and stir for 24 hours to prepare layered Ti 3 C 2 Suspension; then the layered Ti 3 C 2 The suspension is filtered and dried to obtain layered Ti 3 C 2 ;

[0035] S2, the nano silicon particles with a particle size of 30-80nm and layered Ti 3 C 2 It was added to ethanol at a weight ratio of 40:60, ultrasonically dispersed for 60 minutes, and then filtered with suction, and dried at 80° C. for 13 hours to obtain the silicon-layered titanium carbide ano...

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Abstract

The invention discloses a silicon-layered titanium carbide cathode material and a preparation method thereof. A negative electrode material includes silicon particles and layered titanium carbide, wherein the silicon particles are uniformly distributed between a surface of a sheet layer of the layered titanium carbide and the sheet layer. The preparation method comprises steps that Ti3AlC2 or Ti3SiC2 is added to hydrogen fluoride solution to etch to obtain the layered titanium carbide; the layered titanium carbide and the silicon particles are added to solvent for ultrasonic dispersion, afterdrying, the silicon-layered titanium carbide cathode material is obtained. The preparation method of the silicon-layered titanium carbide cathode material is advantaged in that steps are simple, operability is high, the cathode material volume effect is small, and conductive performance and cycle stability are good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon-layered titanium carbide negative electrode material and a preparation method thereof. Background technique [0002] At present, the energy density of a single battery is required to be ≥300KWh / g. For the application of high energy density lithium ions, traditional graphite anode materials can no longer meet the energy density requirements. Silicon-based negative electrode materials have a high theoretical capacity, so silicon-carbon negative electrode materials have begun to be used in lithium-ion battery negative electrode materials. However, due to the significant volume effect of the silicon material during charge and discharge, when the silicon content in the silicon-carbon composite material is high (>20%), the stress caused by the volume change of the battery during the charge and discharge process will cause the negative electrode material to pu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/38H01M10/0525
CPCH01M4/366H01M4/386H01M4/624H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 庄向阳王祖华王光俊
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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