Molybdenum disulfide nanosheet/nanocellulose/carbon nanotube/graphene composite lithium battery thin film negative electrode material and preparation method therefor

A composite technology of nanocellulose and graphene, applied in battery electrodes, secondary batteries, nanotechnology, etc., can solve the problems of deviation from practical application, limit high power performance, limit application, etc., and achieve high efficiency and good mechanical flexibility and continuous bending stability, the effect of avoiding impacts and hazards

Inactive Publication Date: 2016-06-01
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Molybdenum disulfide, as the negative electrode active material of lithium batteries, has the characteristics of high energy storage, but its application in lithium-ion batteries is limited due to its multi-layer flake shape, which is not easy to peel off.
The reported electrochemical performance of flexible Li-ion batteries, especially in terms of high-power performance (fast charging), has not yet reached the level of traditional Li-ion batteries, so the improvement in hig

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one: concrete steps are as follows:

[0028] (1) Primary ultrasonic crushing: take 0.2g of molybdenum disulfide powder after ball milling for 30min, and add it to 20ml of a mixed solvent of ethanol and water with a mass percentage of 50wt%:50wt% for uniform dispersion. Then take 4.85 g of nanocellulose with carboxyl groups on the surface with a mass percentage of 1.03 wt %, dilute it with deionized water to a uniformly dispersed aqueous solution with a mass percentage of 0.25 wt %, and sonicate for 15 minutes. Then add the molybdenum disulfide dispersion liquid into the nanocellulose dispersion liquid, under the ultrasonic conditions of 660w power and 0.6mm horn, and 15°C water cycle condensation, after ultrasonic crushing treatment for 16h, few-layer molybdenum disulfide nanosheets were obtained / nanocellulose dispersion. (2) Secondary ultrasonic peeling: add 0.1g graphene to the molybdenum disulfide / nanocellulose dispersion treated by ultrasonic pulveriza...

Embodiment 2

[0029] Embodiment two: concrete steps are as follows:

[0030] (1) Primary ultrasonic crushing: Add 0.3g of molybdenum disulfide powder after ball milling for 30min to 20ml of a mixed solvent of ethanol and water with a mass percentage of 60wt%:40wt%, and disperse evenly. 3.9 g of nanocellulose with acyl groups on the surface with a mass percentage of 1.54 wt % was taken, diluted with deionized water to a mass percentage of 0.25 wt %, and ultrasonicated for 15 min. Then add the molybdenum disulfide dispersion liquid into the nanocellulose dispersion liquid, under the ultrasonic conditions of 660w power and 0.6mm horn, and 15°C water cycle condensation, after ultrasonic crushing treatment for 20h, few-layer molybdenum disulfide nanosheets were obtained / nanocellulose dispersion. (2) Secondary ultrasonic stripping: add 0.12g graphene to the molybdenum disulfide / nanocellulose dispersion treated by ultrasonic pulverization, and then condense in a water cycle at 15°C under ultras...

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Abstract

The invention relates to a molybdenum disulfide nanosheet/nanocellulose/carbon nanotube/graphene composite lithium battery thin film negative electrode material and a preparation method therefor. The negative electrode material takes nanocellulose as the flexible substrate; the molybdenum disulfide nanosheet, the graphene nanosheet and the carbon nanotube are uniformly mixed and embedded in a network of the nanocellulose to form a flexible self-supporting thin film electrode material with a compact network structure, wherein the composition and the percentage of the thin film negative electrode material are as follows: 60-80wt% of molybdenum disulfide nanosheet, 10-30wt% of nanocellulose, 5-20wt% of carbon nanotube and 5-20% of graphene. By adoption of the method, the renewable energy resource-cellulose can be utilized reasonably and effectively, so that a metal aluminum foil or a copper foil is not required to be used as a current collector; a fluorine-containing polymer is not required to be used as a binder; therefore, influences and hazards to the ecological environment can be greatly avoided; the electrode obtained by the method can be directly filter-pressed, assembled and molded without a tabletting process, so that the preparation method is high in efficiency; and in addition, the thin film negative electrode material is high in mechanical flexibility and continuous bending stability.

Description

technical field [0001] The invention relates to a flexible lithium-ion battery film negative electrode material and a preparation method thereof, in particular to a molybdenum disulfide nanosheet / nanocellulose / carbon nanotube / Graphene composite flexible lithium battery film negative electrode material and preparation method thereof. Background technique [0002] With the rise of wearable electronic products, flexible electronics are developing towards portable, bendable, high-efficiency, low-cost and recyclable. The development of thin, light and flexible lithium-ion batteries with bending stability has become the frontier of research in the field of energy storage. one. However, the current coating and assembly process of lithium-ion batteries determines that traditional lithium-ion batteries cannot be bent. Bending will cause the electrode material to fall off from the current collector, affecting battery performance, and even puncturing the separator, resulting in a sho...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/36H01M4/58H01M4/587H01M4/62H01M4/66H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/364H01M4/5815H01M4/587H01M4/625H01M4/668H01M10/0525Y02E60/10
Inventor 方建慧刘盼盼冯欣施利毅赵亚飞曹绍梅苏永祥沈霞
Owner SHANGHAI UNIV
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