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Bimetal selenide carbon microsphere composite material as well as preparation method and application thereof

A composite material and selenide technology, which is applied in the field of bimetallic selenide carbon microsphere composite materials and its preparation, can solve the problems of selenide agglomeration volume expansion, poor conductivity, etc.

Active Publication Date: 2021-07-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention provides a kind of bimetallic selenide carbon microsphere composite material, and this material has solved the agglomeration phenomenon and volume expansion that exist in selenide in charging and discharging overcharging, the problem of poor electrical conductivity

Method used

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  • Bimetal selenide carbon microsphere composite material as well as preparation method and application thereof
  • Bimetal selenide carbon microsphere composite material as well as preparation method and application thereof
  • Bimetal selenide carbon microsphere composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this embodiment, a double metal selenide carbon microsphere composite material is prepared, which specifically includes the following steps:

[0050](1) Take by weighing 9.5mmol of zinc acetate dihydrate, 0.5mmol of cobalt nitrate hexahydrate, and 10mmol of selenium powder, add 50mL of distilled water, stir for 30min to make it fully dissolve, and the solution is black;

[0051] (2) Add 1mmol glucose and 0.1mol sodium hydroxide to the black solution in (1), stir magnetically for 2h, and the solution is brown;

[0052] (3) Put the solution described in (2) in an autoclave, heat it in an oven for hydrothermal reaction, the reaction temperature is 180°C, and the reaction time is 18 hours;

[0053] (4) naturally cool to room temperature after the reaction is finished, and collect by centrifugation;

[0054] (5) Put the solid material collected in (4) in an oven at 60° C., and dry it in vacuum for 12 hours. After drying, grind the material finely to obtain a bimetallic s...

Embodiment 2

[0072] In this example, the bimetallic selenide carbon microsphere composite material prepared in Example 1 was used to prepare battery pole pieces. Specifically:

[0073] Take 70mg of bimetallic selenide carbon microsphere composite material, conductive agent and binder, mix and grind at a ratio of 7:1.5:1.5, and smear.

[0074] After the pole pieces are vacuum dried, they are stamped into battery pole pieces.

Embodiment 3

[0076] In this example, the battery pole piece prepared in Example 2 was used to assemble a sodium ion battery for electrochemical performance testing.

[0077] Rate performance such as image 3 shown, from image 3 It can be seen that when the current density is 5A·g -1 , the charge specific capacity of the material is 367.5mAh·g -1 , when the current density returns to 0.1A·g -1 , the charging specific capacity was restored to 508.7mAh·g -1 (Initial current density is 0.1A·g -1 , the charging specific capacity is 503.7mAh·g -1 ), it can be seen that the composite negative electrode material for sodium ion battery of the present invention has excellent rate performance. It shows that even at a high current of 5A / g, excellent rate performance can still be obtained, which shows that the electron and ion transport rates of the material are excellent.

[0078] Long cycle performance such as Figure 4 shown, from Figure 4 It can be seen that when the material is subjecte...

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Abstract

The invention provides a bimetallic selenide carbon microsphere composite material as well as a preparation method and application thereof. In the bimetallic selenide carbon microsphere composite material, two kinds of metal selenide are cross-linked with each other through the carbon matrix and are uniformly combined to form microspheres; in the two kinds of metal selenide, the metal valence state of one is relatively high, and the metal valence state of the other is relatively low. By introducing the high-valence metal, the electron and ion transmission effect of the low-valence metal can be improved, and the synergistic effect of the double metals is generated, so that the activity and the sodium storage performance of the material are improved. The carbon matrix not only provides a conductive network, but also limits the volume expansion of the material.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for sodium ion batteries, and in particular relates to a bimetallic selenide carbon microsphere composite material and a preparation method and application thereof. Background technique [0002] In order to reduce energy consumption and meet market demand at the same time, the utilization of new energy and the development of new energy storage technology are the current development trend of the world's energy industry. New energy sources such as solar energy, wind energy, and tidal energy need to be processed and reused through energy storage and conversion devices due to their discontinuity and uncontrollability in time and space. Among many energy storage and conversion devices, chemical power sources have the advantages of high conversion efficiency, strong applicability, and convenient use, and are currently a hot spot in energy technology research. Lithium-ion batteries ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054C01B19/00C01B32/05
CPCH01M4/366H01M4/581H01M4/625H01M4/628H01M10/054C01B32/05C01B19/007C01P2002/72C01P2004/80Y02E60/10
Inventor 丁治英谢旭童汇喻帅刘洋涂瑞萱
Owner CENT SOUTH UNIV
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