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Graphene-based selenium positive electrode material embedded with two-dimensional metal selenide, preparation method of graphene-based selenium positive electrode material and lithium-selenium battery

A metal selenide and graphene-based technology, applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of shuttle effect, slow reaction kinetics of lithium-selenium batteries, etc., and achieve low cost and easy large-scale production Promotion and application, high efficiency effect

Pending Publication Date: 2022-08-05
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Related research schemes are also disclosed in the prior art. For example, patent CN108502844A discloses a redox graphene and selenium nanowire composite positive electrode material, but because the reaction kinetics of lithium-selenium batteries is relatively slow, it will still cause the shuttle effect. occur

Method used

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  • Graphene-based selenium positive electrode material embedded with two-dimensional metal selenide, preparation method of graphene-based selenium positive electrode material and lithium-selenium battery
  • Graphene-based selenium positive electrode material embedded with two-dimensional metal selenide, preparation method of graphene-based selenium positive electrode material and lithium-selenium battery
  • Graphene-based selenium positive electrode material embedded with two-dimensional metal selenide, preparation method of graphene-based selenium positive electrode material and lithium-selenium battery

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Effect test

preparation example Construction

[0079] The present invention also provides a preparation method of the graphene-based selenium composite material, comprising the following steps:

[0080] 1) After grinding and mixing the metal selenide / graphene composite material and the selenium powder, under vacuum conditions, after hot-melting treatment, the graphene-based selenium composite material is obtained.

[0081] In the present invention, the temperature of the hot melt treatment is preferably 240 to 280°C, more preferably 245 to 275°C, more preferably 250 to 270°C, and more preferably 255 to 265°C.

[0082] In the present invention, the time of the hot melt treatment is preferably 12-24 hours, more preferably 14-22 hours, and more preferably 16-20 hours.

[0083] In the present invention, the preparation method of the metal selenide / graphene composite material preferably comprises the following steps:

[0084] After mixing metal salt, graphene oxide and mixed solvent, adding selenium and reducing agent, solvoth...

Embodiment 1

[0109] Put 0.3mmol of Na 2 MoO 4 ·2H 2 Add 50mL GO mixed solution (H 2 O:DMF=2:3) (1 mg / mL). Ultrasonic dispersion was uniform, then 20 mL of selenium hydrazine hydrate solution was added, stirred evenly, and then transferred to a 100 mL hydrothermal kettle, hydrothermally heated at 200 °C for 12 h, washed, dried, and treated at 1000 °C for 2 h to obtain a molybdenum diselenide / graphene composite material.

[0110] The molybdenum diselenide / graphene composite material prepared in Example 1 of the present invention was characterized.

[0111] see figure 1 , figure 1 The high-magnification SEM scanning electron microscope picture of the molybdenum diselenide / graphene composite material prepared by the present invention.

[0112] Depend on figure 1 It can be clearly seen that the two-dimensional sheets of molybdenum diselenide are uniformly dispersed on the graphene sheets.

[0113] see figure 2 , figure 2 The low-magnification SEM scanning electron microscope picture...

Embodiment 2

[0118] Put 0.3mmol of Na 2 WO 4 ·2H 2 Add 50mL GO mixed solution (H 2 O:DMF=2:3) (1 mg / mL). Ultrasonic dispersion was uniform, then 20 mL of selenium hydrazine hydrate solution was added, stirred evenly, and then transferred to a 100 mL hydrothermal kettle, hydrothermally heated at 200 °C for 12 h, washed, dried, and treated at 1000 °C for 2 h to obtain a tungsten diselenide / graphene composite material.

[0119] The tungsten diselenide / graphene composite material and selenium powder were ground and mixed uniformly at a ratio of 3:7, transferred to a sealed vacuum glass tube, and treated at 260 °C for 20 h. A selenium positive electrode material is obtained.

[0120] The performance of the selenium cathode material prepared in Example 2 of the present invention was tested, see Example 3.

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Abstract

The invention provides a graphene-based selenium composite material. The composite material comprises a metal selenide / graphene composite material and selenium compounded on the metal selenide / graphene composite material. Through the chemical adsorption effect of the polar two-dimensional metal selenide on the polyselenide, the discharge intermediate product polyselenide is effectively fixed in the conductive area of the positive electrode, the shuttle effect is inhibited, and the utilization rate of active substances is improved. The two-dimensional metal selenide with a catalytic regulation factor is introduced into the selenium positive electrode material, so that the selenium positive electrode material with chemical adsorption and catalytic action is obtained, and an electrocatalytic effect can be provided to regulate the oxidation-reduction reaction of polyselenide; the shuttle effect of the polyselenide between the selenium positive electrode and the lithium negative electrode in the charging and discharging process of the lithium-selenium battery is further inhibited, the shuttle effect of the polyselenide is obviously inhibited through the synergistic effect of the selenium positive electrode and the lithium negative electrode, and the cycle performance of the battery is improved. The preparation process provided by the invention is simple and easy for large-scale production, popularization and application.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium-selenium batteries, relates to a graphene-based selenium composite material and a preparation method thereof, and a lithium-selenium battery, in particular to a graphene-based selenium-based positive electrode material embedded with two-dimensional metal selenide and its preparation method, lithium selenium battery. Background technique [0002] With the continuous consumption of fossil energy, the energy crisis we are facing and the environmental pollution caused by the use of fossil energy are becoming more and more serious. It is necessary to develop new clean energy, such as wind energy, solar energy, geothermal energy, etc. However, the utilization of clean energy is inseparable from electrochemical energy storage devices. Lithium-ion batteries with safety, high efficiency and environmental protection have been widely studied, but limited by the low theoretic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 姜鹏王庆伟鞠署元巩超
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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