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V2O5/MoS2/EG electrode material and preparation method thereof

A technology of electrode material and negative electrode material, which is applied in the field of V2O5/MoS2/EG electrode material and preparation, can solve the problems of poor mechanical stress, low cycle life, and low electrochemical performance, so as to prevent pulverization, prolong service life, Effect of improving charge and discharge performance

Inactive Publication Date: 2021-03-19
ZHEJIANG NIRUAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of low electrochemical performance, low cycle life and poor mechanical stress of existing lithium-ion battery materials in the process of charging and discharging, and provides a composite MoS with high specific capacity and high rate performance 2 / V 2 o 5 / EG electrode material

Method used

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  • V2O5/MoS2/EG electrode material and preparation method thereof
  • V2O5/MoS2/EG electrode material and preparation method thereof
  • V2O5/MoS2/EG electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032]1) Take 500g Graphite and 25gnano3Add to the ice bath containing 115 ml of concentrated sulfuric acid, stirred, 15g kmno in the mixing process.4After stirring at a temperature of less than 20 ° C, the temperature was raised to 35 ° C and maintained for 2 hours;

[0033]2) 230ml H2O Slowly add to step 1) In the mixture, the temperature is controlled below 98 ° C, and after mixing, the temperature is slowly raised to 98 ° C and maintained for 30 minutes;

[0034]3) Further add 600 ml of warm water to the liquid, then add 100 ml of H2O2The golden yellow particles and dark brown solid particles are formed, and the mixture is filtered, while maintaining thermal heat, further using a warm water of about 1 liter, until the pH of the supernatant is neutral;

[0035]4) Putting step 3) The temperature is raised from 25 ° C to 600 ° C in the tube furnace of 5 ° C / min. Then, the temperature was taken at 600 ° C for 0.5 hours to obtain the product Eg, and Eg was dispersed in N, N-dimethylformamid...

Embodiment 2

[0041]1) Take 500 g of graphite and 25 g of NaNO3 to an ice bath and stirred in a round bottom flask containing 115 ml of concentrated sulfuric acid. After stirring, 15 g kmnO4 is added, and after stirring at a temperature of less than 20 ° C, the temperature is raised to 35 ° C and maintained 2 hour;

[0042]2) 230 ml of H2O is slowly added to step 1), and the temperature is controlled below 98 ° C, and the temperature is slowly raised to 98 ° C and then maintained for 30 minutes;

[0043]3) Further add 600 ml of warm water to the liquid, then add 100 ml of H2O2, which forms golden yellow particles and dark brown solid particles, filtrate the mixture while maintaining warm, further uses about 1 liter of warm water to wash the solid, Until the pH of the supernatant is neutral;

[0044]4) Putting step 3) The temperature is raised from 25 ° C to 600 ° C in the tube furnace of 5 ° C / min. Then, the temperature was obtained at 600 ° C for 3 hours to obtain the product Eg, and Eg was dispersed i...

Embodiment 3

[0050]1) Take 500 g of graphite and 25 g of NaNO3 to an ice bath and stirred in a round bottom flask containing 115 ml of concentrated sulfuric acid. After stirring, 15 g kmnO4 is added, and after stirring at a temperature of less than 20 ° C, the temperature is raised to 35 ° C and maintained 2 hour;

[0051]2) 230 ml of H2O is slowly added to step 1), and the temperature is controlled below 98 ° C, and the temperature is slowly raised to 98 ° C and then maintained for 30 minutes;

[0052]3) Further add 600 ml of warm water to the liquid, then add 100 ml of H2O2, which forms golden yellow particles and dark brown solid particles, filtrate the mixture while maintaining warm, further uses about 1 liter of warm water to wash the solid, Until the pH of the supernatant is neutral;

[0053]4) Putting step 3) The temperature is raised from 25 ° C to 600 ° C in the tube furnace of 5 ° C / min. Then, the temperature was obtained at 600 ° C for 5 hours to obtain the product Eg, and Eg was dispersed i...

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Abstract

The invention relates to a V2O5 / MoS2 / EG electrode material which is formed by compounding V2O5, MoS2 and EG. A binder in a negative electrode material takes DMSO as a binder solvent, a MoS2 / V2O5 / EG composite material is compounded step by step, V2O5 is subjected to melt annealing to eliminate internal stress, V2O5 is compounded in situ by taking EG as a carrier, and the V2O5 is loaded and secondarily compounded with MoS2 to form a sandwich structure. Therefore, the pulverization phenomenon of the lithium ion battery in the charging and discharging process is effectively prevented; the MoS2 / V2O5 / EG composite material has ordered-disordered transformation in the charging and discharging process, ordered nanometer domains are uniformly distributed in a disordered matrix phase, and the quantity and the size of the ordered nanometer domains are increased along with the increase of the discharging / charging period; the ordered nanophase and disordered glass phase synergistically enhance ion dynamics and electron dynamics, and maintain a stable structure in the discharge / charge cycle.

Description

Technical field[0001]The present invention belongs to the preparation of lithium ion batteries, and in particular, the present invention relates to a V in a lithium ion battery having a high specific capacity2O5 / MOS2 / EG electrode material and preparation method.Background technique[0002]The lithium-ion battery (LIB) is one of the most promising energy storage devices, has been applied in many different fields. With the growing demand for large energy storage equipment and hybrid vehicles, high-quality negative electrode materials are urgently needed, and they are the main source of the next generation of LIB battery capacity. To date, most of the research on the anode material is concentrated on carbonaceous materials, metal and semi-metals, and metal oxides. In all these materials, Li+The main mechanism for storage is proven to be inserted. In other words, Li+Ions are inserted into a clearly defined layered crystal of the carbonaceous anode or in the lattice gap position of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/62H01M10/0525C01G31/02C01G39/06
CPCC01G31/02C01G39/06C01P2004/04C01P2006/40H01M4/366H01M4/483H01M4/5815H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈瑞花
Owner ZHEJIANG NIRUAN NEW MATERIAL CO LTD