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Cobalt borate/graphene composite material for negative electrode of lithium ion battery and preparation method

A technology for lithium ion batteries and composite materials, applied in the field of cobalt borate/graphene composite materials and preparation, can solve the problems of poor conductivity of cobalt borate, attenuation, and destruction capacity of electrode materials, and achieves high specific capacity, simple operation, and single product. Effect

Active Publication Date: 2020-04-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few research reports on cobalt borate as the negative electrode material of lithium-ion batteries, and due to the poor conductivity of cobalt borate, the damage to the electrode material and the capacity attenuation are serious during the cycle.

Method used

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  • Cobalt borate/graphene composite material for negative electrode of lithium ion battery and preparation method
  • Cobalt borate/graphene composite material for negative electrode of lithium ion battery and preparation method
  • Cobalt borate/graphene composite material for negative electrode of lithium ion battery and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, the preparation method of the cobalt borate / graphene composite material for the negative electrode of the non-lithium ion battery is as follows:

[0034] (1) Use the modified Hummer method to prepare graphene oxide, that is, weigh 3.0g graphite powder into a 1L flask, then add 120mL concentrated sulfuric acid and 120mL concentrated nitric acid respectively, place in an oil bath, and heat to 80℃ to maintain 4.5 h Carry out pre-oxidation. After cooling to room temperature, 250 mL of deionized water was gradually added in an ice bath and stirred vigorously for 12 h. After the stirring, suction filtration is performed, and the residual acid solution is repeatedly washed with deionized water until the sample is neutral, and the obtained sample is dried at 100°C for 12 hours. After the second oxidation, the pre-oxidized graphite obtained above is added to a 1L flask, 120mL concentrated sulfuric acid is added first, and then 15g potassium permanganate is slow...

Embodiment 2

[0038] The cobalt borate / graphene composite material prepared in Example 1, the binder polyvinylidene fluoride, and the conductive agent acetylene black were dispersed in N,N-dimethylpyrrolidone at a mass ratio of 80:10:10 to prepare a slurry. Coat it evenly on a 9μm thick copper foil, and finally make a round electrode with a diameter of 14mm after drying. Metal lithium is used as the reference electrode and counter electrode, Celgard 2400 (produced by Celgard Diaphragm Co., Ltd., USA) is used as the separator, and the CR2032 button cell is assembled in a glove box with water and oxygen content less than 0.5 ppm. Using lithium hexafluorophosphate (LiPF 6 ) Is dissolved in a mixed solvent composed of ethylene carbonate (EC) and dimethyl carbonate (DMC) at a mass ratio of 1:1, and fluoroethylene carbonate is added to form an electrolyte; in the electrolyte, the molar concentration of lithium hexafluorophosphate is 1M, The mass fraction of fluoroethylene carbonate is 5%. CR2032 ...

Embodiment 3

[0041] The CR2032 button battery assembled in Example 2 was used to test the rate performance at different current densities of 100 mA / g, 250 mA / g, 500 mA / g, and 1000 mA / g. Such as Figure 4 As shown, the rate performance of the prepared cobalt borate / graphene composite material under different current densities. When the current density is 1000mA / g, its specific capacity still reaches 392mAh / g, and when the current density is returned to 100mA / g, its capacity can still return to 728mAh / g, showing superior rate performance.

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a cobalt borate / graphene composite material for a negative electrode of a lithium ion battery and a preparationmethod. The composite material is characterized in that cobalt borate with a nanorod structure is embedded in folded graphene, and the mass percent of cobalt borate is 10-95%. Firstly, water-solublecobalt salt and sodium tetraborate decahydrate are dissolved in deionized water, then a graphene oxide solution is added, the temperature and the reaction duration are controlled under the hydrothermal reaction condition, and graphene oxide is synthesized through a chemical method; and finally, the obtained precipitate is subjected to centrifugal washing and drying to obtain the cobalt borate / graphene composite material for the negative electrode of the lithium ion battery. When the composite material is used as the negative electrode of the lithium ion battery, the composite material has theadvantages of high specific capacity, good cycle performance, excellent rate capability, long cycle life and the like; the preparation method is simple, the cost is low, and industrial large-scale production is easy to realize.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a cobalt borate / graphene composite material suitable for negative electrodes of lithium ion batteries and a preparation method. Background technique [0002] Since commercialized lithium-ion batteries were produced in the early 1990s, lithium-ion batteries have gradually entered people's vision and have now become an indispensable part of people's lives. As one of the most promising energy storage devices, the research on lithium-ion batteries is still a hot topic. From the perspective of the development of lithium-ion batteries, the electrochemical performance of lithium-ion batteries mainly depends on the structure and performance of the electrode materials used. Among them, the application of anode materials is facing various problems, and it is urgent to develop efficient and safe new materials to replace the original carbon electrode materials. [0003] In recent ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M10/0525C01B32/19C01G51/00
CPCH01M4/5825H01M4/625H01M10/0525C01B32/19C01G51/00C01P2004/80C01P2006/40Y02E60/10
Inventor 周宁芳秦伟吴春贾传坤
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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