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Cobalt molybdate/molybdenum disulfide composite material used as lithium ion battery anode material and preparation of cobalt molybdate/molybdenum disulfide composite material

A lithium-ion battery, molybdenum disulfide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of structural damage, poor cycle stability of cobalt molybdate electrodes, etc., and achieve the effect of good stability and high capacity

Active Publication Date: 2018-07-27
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the nano-CoMoO 4 The structure of the cobalt molybdate electrode will be damaged, so the cobalt molybdate electrode shows poor cycle stability

Method used

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  • Cobalt molybdate/molybdenum disulfide composite material used as lithium ion battery anode material and preparation of cobalt molybdate/molybdenum disulfide composite material
  • Cobalt molybdate/molybdenum disulfide composite material used as lithium ion battery anode material and preparation of cobalt molybdate/molybdenum disulfide composite material
  • Cobalt molybdate/molybdenum disulfide composite material used as lithium ion battery anode material and preparation of cobalt molybdate/molybdenum disulfide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of cobalt molybdate / molybdenum disulfide composite lithium ion battery negative electrode material, which comprises the following steps:

[0027] (1) Weigh 1.236 grams of analytically pure ammonium molybdate tetrahydrate and 2.28 grams of analytically pure thiourea, put them in a 50ml beaker, add about 15ml of ultrapure water, dissolve them by ultrasonic, transfer the evenly dispersed mixture to a reaction vessel, and heat React at 180°C for 14 hours, centrifuge the synthesized product and dry it in a vacuum oven at 50°C for 30 hours to obtain molybdenum disulfide;

[0028] (2) After 39 mg of molybdenum disulfide, 62 mg of cobalt acetylacetonate and 75 ml of N-methylpyrrolidone (NMP) containing 6.75 g of ammonium molybdate tetrahydrate were sonicated for 10 minutes, the mixture was reacted in a water bath at 60 °C After 15 hours, the precipitate was separated and dried under vacuum at 40°C for 24 hours to obtain the cobalt molybdate / molybdenum disul...

Embodiment 2

[0035] A preparation method of cobalt molybdate / molybdenum disulfide composite lithium ion battery negative electrode material, which comprises the following steps:

[0036] (1) Weigh 1.6 grams of analytically pure ammonium molybdate tetrahydrate and 2.1 grams of analytically pure thiourea, put them in a 50ml beaker, add about 15ml of ultrapure water, dissolve them by ultrasonic, transfer the evenly dispersed mixture to a reaction vessel, and heat React at 160°C for 20 hours, centrifuge the synthesized product and dry it in a vacuum oven at 45°C for 30 hours to obtain molybdenum disulfide;

[0037] (2) After 26 mg of molybdenum disulfide, 78 mg of cobalt acetylacetonate and 75 ml of N-methylpyrrolidone (NMP) containing 9.0 g of ammonium molybdate tetrahydrate were sonicated for 10 minutes, the mixture was reacted in a water bath at 90 °C After 6 hours, the precipitate was separated and dried under vacuum at 40°C for 24 hours to obtain the cobalt molybdate / molybdenum disulfide ...

Embodiment 3

[0040] A preparation method of cobalt molybdate / molybdenum disulfide composite lithium ion battery negative electrode material, which comprises the following steps:

[0041](1) Weigh 0.98 grams of analytically pure ammonium molybdate tetrahydrate and 2.1 grams of analytically pure thiourea, put them in a 50ml beaker, add about 15ml of ultrapure water, dissolve them by ultrasonic, transfer the evenly dispersed mixture to a reaction vessel, and heat React at 160°C for 20 hours, centrifuge the synthesized product and dry it in a vacuum oven at 45°C for 30 hours to obtain molybdenum disulfide;

[0042] (2) After sonicating 16 mg of the obtained molybdenum disulfide, 78 mg of cobalt acetylacetonate and 75 ml of N-methylpyrrolidone (NMP) containing 3.0 g of ammonium molybdate tetrahydrate for 10 minutes, the mixture was reacted in a water bath at 70 °C After 7 hours, the precipitate was separated and dried under vacuum at 40°C for 24 hours to obtain the cobalt molybdate / molybdenum d...

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Abstract

The invention discloses a cobalt molybdate / molybdenum disulfide composite material used as a lithium ion battery anode material and a preparation method of the cobalt molybdate / molybdenum disulfide composite material. The preparation method comprises the following steps: carrying out hydrothermal reaction on a molybdenum source and a sulfur source which are in a certain proportion, thus generatingmolybdenum disulfide; then mixing the molybdenum disulfide with a cobalt source and a solvent containing the molybdenum source which are in a certain proportion, and enabling nano cobalt molybdate particles to grow in a laminated structure of the molybdenum disulfide, thus forming the cobalt molybdate / molybdenum disulfide composite material. The cobalt molybdate / molybdenum disulfide composite material disclosed by the invention is capable of coordinating the structural characteristics and the electrochemical characteristics between the molybdenum disulfide and the cobalt molybdate, wherein nano CoMoO4 particles are capable of enabling lithium ions to take off and insert back and forth at a higher speed, and higher lithium ion flux is brought; a molybdenum disulfide sheet is used as a support, so that the volume change of CoMoO4 during charging and discharging processes can be effectively buffered, and the structure stability can be kept under the situation of high-rate charging and discharging; by using the cobalt molybdate / molybdenum disulfide composite material as the lithium ion battery anode material, higher specific capacity and good cycle performance can be expressed.

Description

technical field [0001] The invention belongs to the field of preparation of lithium-ion battery materials, and in particular relates to a cobalt molybdate / molybdenum disulfide composite material used as a lithium-ion battery negative electrode material and a preparation method thereof. Background technique [0002] Due to its high energy density and environmental friendliness, lithium-ion batteries have been widely used in 3C, power, and energy storage. However, due to the low specific capacity of commercial graphite anode materials, it is difficult to meet the requirements of high-power devices in modern society. Therefore, it is imminent to find ideal materials with high capacity and good electrochemical performance to replace graphite anode materials. [0003] As a typical compound of transition metal dichalcogenides, molybdenum disulfide is similar to the layered structure of graphite, consisting of upper and lower sulfur atomic layers and molybdenum atomic layers sandw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 刘慧勇王瑞瀚李春雨何凤清汪思宇
Owner FUZHOU UNIV
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