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Battery negative electrode material and preparation method and application thereof

A battery negative electrode, hydrothermal reaction technology, applied in the direction of electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of conductivity and specific surface area decline

Pending Publication Date: 2021-03-09
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, MXene also has the advantages of good conductivity and open structure, which is very suitable for the preparation of electrode materials, but there are still some challenges in practical applications.
For example, MXene is prone to self-stacking, resulting in a serious decrease in conductivity and specific surface area. On the other hand, Professor Gogotisi's research group calculated Ti by DFT 3 C 2 The theoretical capacity of MXene is 320mAh / g, but due to the presence of surface functional groups -OH or -F, Ti 3 C 2 The capacity of MXene is only 130 or 67mAh / g

Method used

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  • Battery negative electrode material and preparation method and application thereof
  • Battery negative electrode material and preparation method and application thereof
  • Battery negative electrode material and preparation method and application thereof

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preparation example Construction

[0029] The present invention also provides a method for preparing the battery negative electrode material described in the above technical solution, comprising the following steps:

[0030] After mixing MXene, nickel salt, iron salt, weak base and water, a hydrothermal reaction is carried out to obtain the battery negative electrode material.

[0031] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0032] The present invention does not have any special limitation on the type of MXene, and the type well known to those skilled in the art can be used. In the present invention, the type of the MXene is more preferably Ti 3 C 2 MXene. The present invention does not have any special limitation on the source of the MXene, and it can be prepared by a preparation method well known to those skilled in the art.

[0033] In the present invention, the nickel salt is preferabl...

Embodiment 1

[0048] 1mmol (0.1676g) Ti 3 C 2 MXene and 70mL deionized water were mixed under ultrasonic conditions for 30min to obtain Ti 3 C 2 After MXene dispersion, mix with 0.75mmol NiCl under the condition of stirring 2 ·6H 2 O, 0.25mmol Fe(NO 3 ) 3 9H 2 O and 2 mmol urea were mixed and stirred for 30 minutes, then transferred to a hydrothermal reaction kettle, and carried out a hydrothermal reaction at a temperature of 120° C. for 18 hours. After cooling down to room temperature, centrifugal washing was performed with deionized water and dried to obtain the negative electrode material of the battery. (Ti 3 C 2 The molar ratio of MXene and NiFe-LDH is 1:1);

[0049] The negative electrode material of the battery is carried out XRD and SEM test, test result is as follows respectively figure 1 and figure 2 shown by figure 1 It can be seen that the battery negative electrode material described in the present invention includes MXene and NiFe-LDH.

Embodiment 2

[0051] 1.5mmol (0.2514g) Ti 3 C 2 MXene and 70mL deionized water were mixed under ultrasonic conditions for 30min to obtain Ti 3 C 2 After MXene dispersion, mix with 0.75mmol NiCl under the condition of stirring 2 ·6H 2 O, 0.25mmol Fe(NO 3 ) 3 9H 2 O and 2 mmol urea were mixed and stirred for 30 minutes, then transferred to a hydrothermal reaction kettle, and carried out a hydrothermal reaction at a temperature of 120° C. for 18 hours. After cooling down to room temperature, centrifugal washing was performed with deionized water and dried to obtain the negative electrode material of the battery. (Ti 3 C 2 The molar ratio of MXene to NiFe-LDH is 1.5:1);

[0052] figure 2 is the SEM image of the negative electrode material of the battery, composed of figure 2 It can be seen that the NiFe-LDH was successfully grown on the surface of the MXene.

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Abstract

The invention relates to the technical field of electrode materials, in particular to a battery negative electrode material and a preparation method and application thereof. The battery negative electrode material comprises MXene and NiFe-LDH growing on the surface of the MXene, wherein the ratio of the total amount of substance of Ni and Fe in the NiFe-LDH to the amount of substance of the MXeneis 1: (0.5-2.5). According to the record of the embodiment, the battery negative electrode material disclosed by the invention has relatively high specific capacity and relatively good cycling stability and rate capability.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a battery negative electrode material and its preparation method and application. Background technique [0002] Energy consumption and environmental pollution are two major problems facing human beings in today's society. In the past ten years, the total amount of disposable energy consumption in China has been on the rise. At the same time, the consumption of these energy sources has brought a series of environmental pollution and ecological problems. . Therefore, it is very important to develop sustainable and clean new energy sources, such as solar energy, wind energy, and tidal energy. Although renewable energy has achieved impressive growth and development in the past 10 years, these energy sources are unevenly distributed, have low conversion efficiency, unstable direct supply, and are limited by time and space, making it difficult to promote and use them on a ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/136H01M4/1391H01M4/36H01M4/52H01M4/58H01M4/02H01M10/0525
CPCH01M4/0471H01M4/136H01M4/1391H01M4/366H01M4/58H01M4/523H01M2004/027H01M10/0525Y02E60/10
Inventor 张新宇李晨阳秦家千刘日平
Owner YANSHAN UNIV