Preparation method of in-situ oxidation growth flower-like structure TiO2/MXene/hard carbon sodium ion battery negative electrode material

A sodium-ion battery, flower-like structure technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of difficult first Coulomb efficiency, achieve good electrochemical performance, increase specific surface area, and good rate performance Effect

Pending Publication Date: 2021-08-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for pure hard carbon, how to improve the capacity and the first Coulombic efficiency has always been a difficult problem that cannot be ignored.

Method used

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  • Preparation method of in-situ oxidation growth flower-like structure TiO2/MXene/hard carbon sodium ion battery negative electrode material
  • Preparation method of in-situ oxidation growth flower-like structure TiO2/MXene/hard carbon sodium ion battery negative electrode material
  • Preparation method of in-situ oxidation growth flower-like structure TiO2/MXene/hard carbon sodium ion battery negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3， comparative example 1

[0025] Embodiment 1-3, comparative example 1 scheme is as follows:

[0026] Program Ball mill gas atmosphere Carbonization temperature (℃) Milling time (h) ball to material ratio speed(rpm) Example 1 Air 800 12 10∶1 600 Example 2 Air 1000 16 20∶1 500 Example 3 Air 1200 10 20∶1 600 Comparative example 1 Argon 800 12 10∶1 600

Embodiment 1

[0028] An In Situ Oxidation Growth Flower-like TiO 2 / MXene / The preparation method of the preparation method of the negative electrode material of the hard carbon sodium ion battery, the specific process includes the following steps:

[0029] Step 1. Heat the popcorn to 230°C at a heating rate of 3°C / min under normal pressure, keep it warm for 6 hours, and perform heat stabilization treatment to obtain pre-oxidized popcorn;

[0030] Step 2. Put the corundum boat with pre-oxidized popcorn into the tube furnace. In the atmosphere of inert gas, the tube furnace is heated up to 800 °C at a rate of 3 °C / min and kept for 2 hours. After natural cooling, the obtained Popcorn hard carbon material;

[0031] Step 3, grinding popcorn hard carbon into powder, and then sieving with a 400-mesh sieve to obtain small popcorn hard carbon particles with uniform particle size;

[0032] Step 4. Mix the sieved popcorn hard carbon with MXene in the air environment with water as the solvent, and t...

Embodiment 2

[0034] An In Situ Oxidation Growth Flower-like TiO 2 / MXene / The preparation method of the preparation method of the negative electrode material of the hard carbon sodium ion battery, the specific process includes the following steps:

[0035] Step 1, heating the popcorn to 250°C at a rate of 5°C / min under normal pressure, keeping it warm for 7 hours, and performing heat stabilization treatment to obtain pre-oxidized popcorn;

[0036] Step 2. Put the corundum boat with pre-oxidized popcorn into the tube furnace. The tube furnace is heated up to 1000 °C at a rate of 5 °C / min in an atmosphere of inert gas and kept for 4 hours. After natural cooling, the obtained Popcorn hard carbon material;

[0037] Step 3, grinding popcorn hard carbon into powder, and then sieving with a 300-mesh sieve to obtain small popcorn hard carbon particles with uniform particle size;

[0038] Step 4. Mix the sieved popcorn hard carbon with MXene in the air environment with water as the solvent, and t...

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Abstract

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a preparation method of an in-situ oxidation growth flower-like structure TiO2 / MXene / hard carbon sodium ion battery negative electrode material. The method comprises the following steps: (1) in an air atmosphere, heating popcorn to 230-280 DEG C, and carrying out pre-oxidation treatment; (2) putting the pre-oxidized popcorn into an atmosphere furnace, and carbonizing at 800-1400 DEG C for 2-3 hours to obtain popcorn hard carbon; (3) grinding and sieving the popcorn hard carbon to obtain hard carbon powder with a particle size of less than 48 [mu] m; and (4) mixing the sieved hard carbon powder with multiple layers of MXene, and carrying out ball milling in an air environment by taking water as a solvent. Under the action of huge energy generated by collision of ball-milling beads, the multiple layers of MXene are stripped and react with air to generate TiO2 nanorods through in-situ oxidation at the same time, so that a TiO2 / MXene / hard carbon composite material with a flower-shaped structure, namely the sodium ion battery negative electrode material, is formed. A unique flower-shaped structure is formed through ball milling regulation and control, and the sodium storage performance of the material is improved. When the composite material is used as a negative electrode of a room-temperature sodium-ion battery, the specific capacity of the battery can be effectively improved, and the cycle performance is enhanced. Meanwhile, the method is simple and feasible to operate, pollution-free to environment and suitable for popularization and application.

Description

[0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to an in-situ oxidation growth flower-like structure TiO 2 / MXene / Preparation method of hard carbon sodium ion battery negative electrode material. Background technique [0002] With the impending depletion of non-renewable energy sources such as fossil fuels and the increasing environmental pollution, energy and environmental issues cannot be ignored. At present, the main energy storage devices in the field of secondary batteries are lithium-ion batteries. However, the uneven distribution and rising price of lithium limit the further application of lithium due to the increasing demand for electronic devices and electric vehicles. In this case, large-scale energy storage using more abundant sodium substitutes is one of the main ways to solve environmental, resource, and energy problems. Although Li-ion batteries and Na-ion batteries have similarities in electrochemical mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/054
CPCH01M4/362H01M4/483H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 徐志伟高攀石海婷梁帅统裴晓园刘梁森牛家嵘刘丽艳
Owner TIANJIN POLYTECHNIC UNIV
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