A kind of preparation method and application of lithium selenium battery cathode material

A battery cathode and cathode material technology, applied in the field of material chemistry, can solve the problems of losing the layered structure and affecting the selenium loading of the active material, and achieve the effects of good electrical conductivity, stable physicochemical properties, and high specific surface area

Active Publication Date: 2022-05-31
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, Ti 3 C 2 Nanosheets also have a graphene-like two-dimensional sheet structure. When they are used as a lithium-selenide battery positive electrode to load sulfur, it is inevitable that the stacking phenomenon between sheets will occur, which will lead to Ti 3 C 2 Nanosheets lose their original layered structure and affect the loading of active material selenium

Method used

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  • A kind of preparation method and application of lithium selenium battery cathode material
  • A kind of preparation method and application of lithium selenium battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step is to prepare Ti 3 C 2 Dispersions;

[0025]The MAX phase Ti 3 C 2 The Al powder was slowly dispersed in deionized water, and the ultrasonic dispersion was uniform. Among them, the MAX phase Ti 3 C 2 The ratio of Al powder to deionized water is: 1g Ti 3 C 2 The Al powder corresponds to 150 mL of deionized water. The HF solution was then slowly added dropwise with magnetic stirring. The concentration of the HF solution is 30%, and the volume dosage of the HF solution is 50% of the volume of deionized water. After the dropwise addition was completed, the magnetic stirring was continued for 24 hours and then left to stand for stratification, and deionized water and anhydrous ethanol were used for repeated high-speed centrifugal cleaning. When the remaining liquid after high-speed centrifugation was neutral, the centrifugal cleaning was stopped to obtain Ti. 3 C 2 Dispersions.

[0026] The second step is to prepare Ti 3 C 2 / Sb 2 Se 3 composit...

Embodiment 2

[0031] Embodiment 2: other is the same as embodiment 1, the difference is the second step Ti 3 C 2 Solute and Sb 2 Se 3 The solute mass ratio is 1:10.

Embodiment 3

[0032] Embodiment 3: other with embodiment 1, the difference is the second step Ti 3 C 2 Solute and Sb 2 Se 3 The solute mass ratio is 1:20.

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Abstract

The invention relates to a preparation method of a cathode material of a lithium-selenium battery and an application thereof in a lithium-selenium battery. The preparation method is based on the spray drying technology, and the Ti with three-dimensional support structure is prepared. 3 C 2 / Sb 2 Se 3 / Se positive electrode material can not only increase the loading rate of the active material, but also its special three-dimensional support structure can prevent the lithium-selenium battery positive electrode material from collapsing during repeated charging and discharging, thereby improving the electrochemical performance of the lithium-selenium battery. , effectively improving the specific discharge capacity and cycle stability of lithium-selenium batteries.

Description

technical field [0001] The invention relates to a preparation method of a lithium-selenium battery cathode material and its application in the lithium-selenium battery, in particular to a method for preparing a selenium-loaded material with a three-dimensional support structure based on spray drying granulation, belonging to the field of material chemistry. Background technique [0002] With the continuous upgrading of portable electronic products and battery-powered vehicles, the demand for high-energy-density energy storage devices is increasing, and the development of high-energy-density electrode materials has become a key topic of current scientific research. In recent years, the lithium-sulfur battery system based on the conversion reaction has attracted extensive attention due to its high specific capacity, but the sulfur as the active material in the lithium-sulfur battery system has low conductivity and a serious "shuttle effect" caused by polysulfides during the cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M10/052
CPCH01M4/364H01M4/587H01M4/58H01M4/38H01M10/052H01M2004/028Y02E60/10
Inventor 张永光孙正豪
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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