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Graphene composite transition metal oxide nanofiber lithium ion battery electrode material and preparation method thereof

A graphene composite, lithium-ion battery technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve the problems of weak bonding, easy to fall off, poor long-term cycle stability, etc., to improve cycle stability performance, improve Lithium intercalation capacity, beneficial effect of intercalation and deintercalation

Inactive Publication Date: 2015-09-23
DALIAN OCEAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the current preparation technology, most of the transition metal oxides are nanoparticles, which leads to weak combination with graphene and easy to fall off during charging and discharging, resulting in the agglomeration of transition metal oxides and the oxidation of graphene transition metals. The long-term cycling stability of composite electrode materials at high rates is still poor

Method used

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  • Graphene composite transition metal oxide nanofiber lithium ion battery electrode material and preparation method thereof
  • Graphene composite transition metal oxide nanofiber lithium ion battery electrode material and preparation method thereof
  • Graphene composite transition metal oxide nanofiber lithium ion battery electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] 1) Preparation of isocyanate-modified graphene oxide dispersion

[0033]Disperse 0.1 mg or 0.5 mg or 1 mg or 4 mg or 6 mg or 8 mg or 10mg of graphene oxide (0.1-10mg can be) into 1mL or 2mL or 4mL or 6mL or 8mL or 10mL (1-10mL can be ) in dimethylformamide or dimethylacetamide or tetrahydrofuran or dichloromethane or dichloroethane or acetone or ethanol solvent, magnetic stirring for 1h or 1.5h or 2h (1 h -2 h is acceptable), and then Ultrasonic dispersion for 30 minutes or 40 minutes or 50 minutes or 60 minutes (30-60 minutes can be used). The temperature rises to 30°C or 35°C or 40°C (30°C-40°C is acceptable), and then under the protection of nitrogen, add 0.1 mg or 0.2 mg or 0.4 mg or 0.6 mg or 0.8 mg or 1 mg (0.1 mg -1 mg can be) methyl isocyanate or toluene diisocyanate or diphenylmethane diisocyanate or dicyclohexylmethane diisocyanate, stirred for 24h or 30h or 48h (in 24h -48h can be), to obtain isocyanate modified oxidation Graphene dispersion.

[0034] In t...

Embodiment 2

[0043] 1) Disperse 5 mg of graphene oxide into 10 mL of dimethylformamide solvent, stir magnetically for 1 h, and disperse ultrasonically for 60 min. The temperature was raised to 30° C., and then under the protection of nitrogen, 0.1 mg of isocyanate was added and stirred for 24 hours to obtain an isocyanate-modified graphene oxide dispersion.

[0044] 2) Dissolve 0.1 g of manganese acetate in 10 mL of isocyanate-modified graphene oxide dispersion, and stir at room temperature for 1 h. Then, 1.67 g of polystyrene was added to the above solution, and a mixed solution with a concentration of 15% (wt) was prepared, and magnetically stirred for 3 hours until a uniform, stable, and viscous solution was formed.

[0045] 3) Inhale the solution in step 2) into a 10ml glass syringe equipped with a 9# stainless steel needle, the receiving device uses flat aluminum foil, and the distance from the stainless steel needle tip to the receiving device is 15cm. The stainless steel needle is ...

Embodiment 3

[0048] 1) Disperse 5 mg of graphene oxide into 10 mL of dimethylformamide solvent, stir magnetically for 1 h, and disperse ultrasonically for 60 min. The temperature was raised to 30° C., and then under the protection of nitrogen, 0.1 mg of isocyanate was added and stirred for 24 hours to obtain an isocyanate-modified graphene oxide dispersion.

[0049] 2) Weigh 2 ml of butyl titanate and dissolve in 10 ml of isocyanate-modified graphene oxide dispersion, and stir at room temperature for 1 h. Then add 0.3 g of polyacrylonitrile to the above solution, configure a mixed solution with a concentration of 10% (wt), and stir it magnetically for 3 hours until a uniform, stable and viscous solution is formed.

[0050] 3) Inhale the solution in step 2) into a 10ml glass syringe equipped with a 9# stainless steel needle. The receiving device is made of flat aluminum foil, and the distance from the tip of the stainless steel needle to the receiving device is 20cm. The stainless steel ne...

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Abstract

The invention discloses a graphene composite transition metal oxide nanofiber lithium ion battery electrode material and a preparation method thereof. The composite electrode material combines a function of a graphene laminated structure for embedding and binding transition metal oxide nanoparticles, a function of a micropore tunnel structure interconnected in graphene composite transition metal oxide nanofiber for quickly embedding and taking off lithium ions and a function of three-dimensional space structures wound with each other among nanofibers and used for effectively releasing greatly-changed stress when the volume in an electrode membrane is expanded or contracted. Due to the integration of the three functions, the volume effect of the transition metal oxide material in the process of embedding / taking off the lithium ions can be effectively restrained and buffered, the loss of the irreversible capacity can be reduced, and then, the capacity and the cycling stability performance of a lithium ion battery are further improved.

Description

technical field [0001] The invention relates to a graphene composite transition metal oxide nanofiber lithium-ion battery electrode material and a preparation method thereof, in particular to an electrode material that can effectively suppress and buffer the volume effect of transition metal oxide materials in the intercalation / delithiation process, reducing Irreversible capacity loss, thereby obtaining lithium-ion battery electrodes with high capacity and stable cycle performance, belongs to the field of new chemical power sources and their preparation technologies. Background technique [0002] Lithium-ion batteries have attracted widespread attention because of their advantages such as high voltage, high capacity, high power, and stable discharge. In the last ten years, with the continuous development of the integrated circuit (IC) and microelectromechanical system (MEMS) industries, higher requirements have been put forward for new embedded batteries that match them. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/48B82Y30/00
CPCY02E60/10
Inventor 潘超汪静
Owner DALIAN OCEAN UNIV
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