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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

AI Technical Summary

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 caused by the volume change of the battery during the charge and discharge process will cause the negative electrode material to pulverize and separate from the current collector. , volume diving

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

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Effect test

Embodiment 1

[0020] A kind of preparation method of described silicon-layered titanium carbide negative electrode material that the present invention proposes, comprises the following steps:

[0021] S1. Weigh Ti 3 AlC 2 Powder 10g, add 100g mass concentration and be in the HF solution of 40%, stir for 48 hours and etch, obtain Ti 3 C 2 suspension, the resulting Ti 3 C 2 The suspension is filtered and dried 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 titanium carbide anode material.

[0023] figure 1 It is a schematic structural view of silicon-layered titanium carbide negative electrode material in Example 1 of the present invention; by figure 1 It can be seen that in the silicon-layered titanium carbide negative electrode material, n...

Embodiment 2

[0028] A kind of preparation method of described silicon-layered titanium carbide negative electrode material that the present invention proposes, comprises the following steps:

[0029] S1. Weigh Ti 3 AlC 2 Powder 10g, add 150g mass concentration and be in the HF solution of 20%, stir 72 hours, prepare the suspension of layered titanium carbide; Then the suspension of layered titanium carbide is filtered, dry, obtain layered titanium carbide;

[0030] S2. Add nano-silicon particles and layered titanium carbide into ethanol at a weight ratio of 5:95, ultrasonically disperse for 5 minutes, filter with suction, and then dry at 105°C for 4 hours to obtain the silicon-layered titanium carbide negative electrode material.

Embodiment 3

[0032] A silicon-layered titanium carbide negative electrode material proposed by the present invention includes silicon particles and layered titanium carbide, and the silicon particles are evenly distributed on the surface and between the sheets of the layered titanium carbide.

[0033] A kind of preparation method of described silicon-layered titanium carbide negative electrode material that the present invention proposes, comprises the following steps:

[0034] S1. Weigh Ti 3 SiC 2 Powder 10g, add 100g mass concentration and be in the HF solution of 50%, stir 24 hours, prepare layered Ti 3 C 2 suspension; then the layered Ti 3 C 2 The suspension was filtered and dried to obtain layered Ti 3 C 2 ;

[0035] S2, the particle size is 30-80nm nano-silicon particles and layered Ti 3 C 2 Add it into ethanol at a weight ratio of 40:60, ultrasonically disperse for 60 minutes, then filter with suction, and dry at 80° C. for 13 hours to obtain the silicon-layered titanium ca...

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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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