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Preparation method of lithium ion battery and supercapacitor electrode material

A technology for lithium ion batteries and supercapacitors, which is applied in the manufacture of hybrid capacitor electrodes, battery electrodes, and hybrid/electric double layer capacitors, etc., can solve the problems of metal oxysulfide nanosheets and graphene oxide thickness, size and distribution randomness. The reaction sites cannot be fully utilized, and the preparation process is complicated, so as to achieve the effect of improving cycle stability, excellent cycle performance, and improving transmission capacity.

Active Publication Date: 2018-03-23
苏州市洛肯电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness, size and distribution of the metal oxysulfide nanosheets and graphene oxide in the mixed hybrid structure obtained by method 1 are relatively random, resulting in that the reaction sites cannot be fully utilized.
Method 2 requires pre-exfoliation of metal oxysulfides, the reaction conditions are harsh, difficult to control, and the stripping efficiency is low
Both of them generally use graphene oxide as a carrier for compounding, and then reduce it to graphene (rGO) through post-processing. The preparation process is complicated and it is not easy to produce in large quantities.

Method used

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  • Preparation method of lithium ion battery and supercapacitor electrode material
  • Preparation method of lithium ion battery and supercapacitor electrode material
  • Preparation method of lithium ion battery and supercapacitor electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 2gMoS respectively 2 Add 2g of graphene oxide powder into the ball mill jar together; weigh another 28 g of agate balls into the ball mill jar; package the ball mill jar and perform ball milling on a planetary ball mill; set the speed of the ball mill to 500r min -1 , the agate balls were separated after ball milling for 5h to obtain few-layer MoS 2 Composite assembled with graphene. figure 1 is the scanning electron microscope image of the obtained composite. It can be seen that there are many warped parts on the edge of the layer, indicating that the ball milling process has produced effective peeling. figure 2 The transmission electron microscope image further shows the composition of the layered material after ball milling, and it can be seen that MoS with few layers and smaller size 2 The sheets are efficiently assembled with the graphene.

[0031] The resulting MoS2 / Graphene composite is used as the electrode material, mixed with the conductive agent ac...

Embodiment 2

[0034] Weigh 2gMoS respectively 2 Add 1g of graphene oxide powder into the ball mill jar; weigh 90 g of agate balls and add them to the ball mill jar; package the ball mill jar and perform ball milling on a planetary ball mill; set the ball mill speed to 400r min -1 , after ball milling for 5h, the agate balls were separated to obtain MoS 2 / graphene composite.

[0035] As a lithium-ion battery electrode material test shows: at 0.1A g –1 Under the high current density, the specific capacity of the battery reaches 850mAh·g -1 . As a supercapacitor electrode material test shows: at 4A g –1 Under the current density, the specific capacitance reaches 220F·g -1 .

Embodiment 3

[0037] Weigh 4gMoS respectively 2 Add 1g of graphene oxide powder into the ball milling jar; weigh 100 g of agate balls and add them to the ball milling jar; package the ball milling jar and perform ball milling on a planetary ball mill; set the speed of the ball mill to 350r min -1 , after ball milling for 10h, the agate balls were separated to obtain MoS 2 / graphene composite.

[0038] As a lithium-ion battery electrode material test shows: at 0.1A g –1 Under the current density, the specific capacity of the battery reaches 880mAh·g -1 . As a supercapacitor electrode material test shows: at 4A g –1 Under the current density, the specific capacitance reaches 250F·g -1 .

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Abstract

The invention discloses a preparation method of a lithium ion battery and a supercapacitor electrode material. The preparation method comprises following steps: 1, two dimensional metal oxides and sulfides, and oxidized graphene are weighed at a certain mass ratio and are mixed to be uniform; 2, an obtained mixture is subjected to ball millilng so as to obtain a composite material formed via ordered stacking of metal oxides and sulfides / graphene, wherein the mass ratio of the metal oxides and sulfides to graphene is controlled to be x:1, 1<=x<=14, and the metal oxides and sulfides are MoS2, MoO3, V2O5, or VS2. According to the preparation method, in ball milling processing, oxidized graphene is reduced gradually, and peeling is realized gradually; peeling of the two dimensional metal oxides and sulfides is realized gradually; assembling of the oxidized graphene with the two dimensional metal oxides and sulfides is realized, so that transmission capability of charges in the two mediumsis increased, electrode material rate capability is improved; the existing of graphene is capable of increasing material flexibility, improving the volume effect resistance of the supercapacitor electrode material in charge and discharge process, and increasing electrode material cycling stability.

Description

technical field [0001] The invention relates to the technical field of chemistry, in particular to the technical field of lithium ion batteries and supercapacitors. Background technique [0002] With the increasing demand for power vehicles and new energy sources, the research and development of high-performance chemical power storage materials is imminent. Two-dimensional layered metal oxysulfides have a large number of sites for charge insertion between layers, and have great energy storage potential, which has aroused widespread interest among electrochemical researchers. And its central metal atom has abundant oxidation states, so in the charge and discharge process, 1mol electrode material can capture several mol electrons, so it has a high theoretical specific capacity. For example: MoS 2 As a supercapacitor electrode material, its theoretical specific capacitance is 1000F·g –1 , as a lithium-ion battery anode material, its specific capacitance is 670mAh·g –1 . Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/62H01G11/30H01G11/32H01G11/86
CPCH01G11/30H01G11/32H01G11/86H01M4/366H01M4/48H01M4/5815H01M4/625Y02E60/10Y02E60/13
Inventor 季红梅杨刚胡嵩
Owner 苏州市洛肯电子科技有限公司
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