Battery material and preparation method thereof

A technology for battery materials and electrode materials, which is applied in the preparation/purification of battery electrodes, lithium batteries, and carbon, can solve problems such as structural damage, reduction in electrical conductivity, and limit the rate performance of battery materials, to avoid oxidation and structural damage, Simple and controllable effect

Active Publication Date: 2020-10-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidized Ti 3 C 2 T x The electrical conductivity decreases and the structure is destroyed, which is not conducive to electron transport and ion diffusion, which greatly limits the rate performance of battery materials.

Method used

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  • Battery material and preparation method thereof
  • Battery material and preparation method thereof
  • Battery material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1: Using iron salt and alcohol solution as raw materials, prepare C-Fe by solvothermal method 3 o 4 particles;

[0046] Step 1-1: Add 0.1 mmol of iron salt to 50 ml of ethylene glycol solution, and magnetically stir at 600 rpm / min for 60 min until the solution is transparent; then, at the same magnetic stirring speed, add 1.5 g of non-ionic polymer surface Active agent, continue to stir for 2h; then add 24mmol of amine, continue to stir at the same magnetic stirring speed for 30min, to obtain a transparent solution;

[0047] Step 1-2: Move the transparent solution finally obtained in step 1-1 into a reaction kettle and seal it, and keep it warm at 200°C for 2 hours to obtain a reaction product;

[0048] Step 1-3: Use deionized water and absolute ethanol to alternately wash the reaction product obtained in step 1-2 for 6 times, then place the washed reaction product in a vacuum drying oven, and heat it at 80°C for 24 hours to dry dry, prepared 20nm C-Fe 3 o 4 p...

Embodiment 2

[0056] Step 1: Using iron salt and alcohol solution as raw materials, prepare C-Fe by solvothermal method 3 o 4 particles;

[0057] Step 1-1: Add 0.1 mmol of iron salt to 50 ml of ethylene glycol solution, and magnetically stir at 600 rpm / min for 60 min until the solution is transparent; then, at the same magnetic stirring speed, add 1.4 g of non-ionic polymer surface Active agent, continue to stir for 2h; then add 20mmol of amine, continue to stir at the same magnetic stirring speed for 30min, to obtain a transparent solution;

[0058] Step 1-2: Move the transparent solution finally obtained in step 1-1 into a reaction kettle and seal it, and keep it warm at 180°C for 6 hours to obtain a reaction product;

[0059] Step 1-3: Use deionized water and absolute ethanol to alternately wash the reaction product obtained in step 1-2 for 6 times, then place the washed reaction product in a vacuum drying oven, and heat it at 80°C for 24 hours to dry Dry, prepared to obtain 100nm C-F...

Embodiment 3

[0066] Step 1: Using iron salt and alcohol solution as raw materials, prepare C-Fe by solvothermal method 3 o 4 particles;

[0067] Step 1-1: Add 0.1 mmol of iron salt to 50 ml of ethylene glycol solution, and magnetically stir at 600 rpm / min for 60 min until the solution is transparent; then, at the same magnetic stirring speed, add 1.25 g of non-ionic polymer surface Active agent, continue to stir for 2h; then add 17.5mmol of amine, continue to stir at the same magnetic stirring speed for 30min, to obtain a transparent solution;

[0068] Step 1-2: Move the transparent solution finally obtained in step 1-1 into a reaction kettle and seal it, and keep it warm at 170°C for 10 hours to obtain a reaction product;

[0069] Step 1-3: Use deionized water and absolute ethanol to alternately wash the reaction product obtained in step 1-2 for 6 times, then place the washed reaction product in a vacuum drying oven, and heat it at 80°C for 24 hours to dry dry, prepared 200nm C-Fe 3 o...

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Abstract

The invention discloses a battery material and a preparation method thereof. Carbon-coated Fe3O4 particles are prepared by using a solvothermal method, firstly, a carbon layer generated by solvothermal can improve the conductivity of the Fe3O4 particles to a great extent, and meanwhile, material pulverization caused by stress in a Fe3O4 charging and discharging process can be effectively relieved.Secondly, rich oxygen-containing functional groups exist on the surface of a carbon layer prepared through a solvothermal method, and the composite material is prepared through the interaction between the rich functional groups on the surface of carbon and the functional groups on the surface of Ti3C2Tx. According to the Ti3C2Tx-C-Fe3O4 composite material prepared by the preparation method disclosed by the invention, on one hand, the conductivity of Fe3O4 is improved, and a part of stress generated by Fe3O4 lithium intercalation and de-intercalation is relieved; and on the other hand, stacking of Ti3C2Tx is reduced to a great extent, the specific surface area of Ti3C2Tx is increased, and the structural stability of the composite material is greatly improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and relates to a 3 C 2 T x -C-Fe 3 o 4 Battery materials and preparation methods. Background technique [0002] Lithium batteries are widely used in electronic devices. At present, the commercial lithium battery anode material is mainly graphite, but due to the low theoretical capacity (372mAh g-1) and poor rate performance of graphite, it cannot meet the current requirements of rapid charge and discharge and high energy density of lithium batteries. Therefore, it is necessary to prepare a new lithium battery anode material with high capacity, high rate and stable structure. [0003] Ferric oxide (Fe 3 o 4 ) has a high theoretical capacity (926mAh g-1) and can achieve reversible deintercalation of lithium ions. Ti 3 C 2 T x (T represents a functional group, usually -O, -OH and -F, etc., x=1,2,3) is a two-dimensional layered material with excellent electrical conductivity and low lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/62H01M10/052C01B32/05C01B32/921C01G49/08
CPCC01G49/08C01P2004/03C01P2004/04C01P2004/20C01P2004/30C01P2004/32C01P2004/61C01P2004/62C01P2004/64C01P2006/40C01B32/05C01B32/921H01M4/366H01M4/523H01M4/583H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 周健李强孙志梅
Owner BEIHANG UNIV
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