A kind of lithium-ion battery multi-walled carbon nanotube/molybdenum disulfide composite electrode and preparation method

A technology of multi-walled carbon nanotubes and lithium-ion batteries, which is applied in the direction of battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of reducing the conductivity of carbon nanotubes, uneven loading, etc., and achieve increased electrochemical Performance, reduced surface tension, excellent specific surface area effect

CN106711413BActive Publication Date: 2019-07-19HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-07-19

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Abstract

The invention provides a lithium-ion-battery multiwalled carbon nanotube / molybdenum disulfide combination electrode and a preparation method. According to the preparation method, multiwalled carbon nanotube, soluble molybdate and L-cysteine are adopted as materials, glucose and triton X-100 are used as additives, dispersion uniformity of MoS2 on the surface of the carbon nanotube is improved, and through an in-situ hydrothermal reduction method, a combination electrode material of MoS2 and the multiwalled carbon nanotube is synthesized. The material has high electrochemical storage lithium specific capacity, excellent cycle performance and a high-rate feature. Meanwhile, the synthetic method has the advantages of being moderate in reaction condition, simple in process, high in yield and good in repeatability.
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Description

technical field

[0001] The invention belongs to the field of new chemical power sources and new energy materials, in particular to lithium-ion battery electrode materials and preparation methods, especially graphene-like MoS 2 Lithium-ion battery electrodes with high capacity and stable cycle performance prepared with multi-walled carbon nanotube composites as electrochemically active materials. Background technique

[0002] With the rapid development of portable electronic devices and electric vehicle industries and the continuous improvement of energy storage system requirements, the research and application of lithium-ion batteries have received extensive attention. Electrode materials, as an important part of lithium-ion batteries, have also received increasing attention. The currently commercialized lithium-ion negative electrode material is graphite electrode. Although it has good conductivity, its low energy density and volume density restrict its further application...

Examples

Embodiment 1

[0037] Graphene-like MoS for lithium-ion batteries 2 A method for preparing a composite electrode with multi-walled carbon nanotubes, comprising the following steps:

[0038] (1) Ultrasonic co-oxidation treatment of multi-walled carbon nanotubes

[0039] Disperse 0.1g of multi-walled carbon nanotubes with a size of 30nm in 30ml of a mixed solution consisting of nitric acid and sulfuric acid at a volume ratio of 1:2.5, and perform ultrasonic oxidation treatment at 25°C, with the time controlled at 180min and the ultrasonic power at 60W , prepare the carbon nanotube suspension, then adjust the pH value to 8 with sodium carbonate, and then centrifuge to obtain the multi-walled carbon nanotube after oxidation treatment.

[0040] (2) Preparation of graphene-like MoS 2 Composite nanomaterials with multi-walled carbon nanotubes M O S 2 / CNTS

[0041] Dissolve sodium molybdate in a mixed solution of ethanol and water with a volume ratio of 1:1 to form a 0.02mol / L solution, add L-...

Embodiment 2

[0048] (1) Ultrasonic co-oxidation treatment of multi-walled carbon nanotubes

[0049] Disperse 0.5g of multi-walled carbon nanotubes with a size of 50nm in 50ml of a mixed solution composed of nitric acid and sulfuric acid at a volume ratio of 1:2.5, and perform ultrasonic oxidation treatment at 60°C, with the time controlled at 120min and the ultrasonic power at 90W , preparing a suspension of carbon nanotubes, adjusting the pH value to 9 with ammonia water, and centrifuging to obtain multi-walled carbon nanotubes after oxidation treatment;

[0050] (2) Preparation of graphene-like MoS 2 Composite nanomaterial MoS with multi-walled carbon nanotubes 2 / CNTS

[0051] Dissolve sodium molybdate in a mixed solution of ethanol and water at a volume ratio of 1:5 to form a 0.07mol / L solution, add L-cysteine ​​as a sulfur source and reducing agent, L-cysteine ​​and molybdic acid The ratio of the amount of the substance of sodium is 8:1, then the multi-walled carbon nanotubes after...

Embodiment 3

[0055] (1) Ultrasonic co-oxidation treatment of multi-walled carbon nanotubes

[0056] Disperse 0.5g of multi-walled carbon nanotubes with a size of 50nm in 50ml of a mixed solution consisting of nitric acid and sulfuric acid at a volume ratio of 1:2.5, and perform ultrasonic oxidation treatment at 60°C, with the time controlled at 180min and the ultrasonic power at 90W , preparing a suspension of carbon nanotubes, adjusting the pH value to 9 with sodium hydroxide, and centrifuging to obtain multi-walled carbon nanotubes after oxidation treatment;

[0057] (2) Preparation of graphene-like MoS 2 Composite nanomaterial MoS with multi-walled carbon nanotubes 2 / CNTS

[0058] Dissolve sodium molybdate in a mixed solution of ethanol and water with a volume ratio of 1:5 to form a 0.05mol / L solution, add L-cysteine ​​as a sulfur source and reducing agent, L-cysteine ​​and molybdic acid The ratio of the amount of the substance of sodium is 10:1, then the multi-walled carbon nanotubes...