Hierarchical porous structure carbon material for negative electrode of power lithium-ion battery and preparation method of hierarchical porous structure carbon material

A lithium-ion battery, hierarchical hole technology, applied in the direction of battery electrodes, structural parts, carbon preparation/purification, etc., can solve problems such as difficult to achieve large-scale preparation, complicated preparation process, and difficult to repeat

Active Publication Date: 2012-07-11
BEIJING UNIV OF CHEM TECH
View PDF2 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this method needs to use the carbon precursor solution to impregnate the pores in the template multiple times, and then soak in acid solution to remove the template, which has the disadvantages of complicated preparation process, low yield, difficult to repeat, and difficult to achieve large-scale preparation.
In addition, the hierarchical pore structure carbon material prepared by this method is a macroscopic bulk material. When it is used as an electrode material, the diffusion path of ions is still relatively large, and the large-rate performance needs to be further improved.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hierarchical porous structure carbon material for negative electrode of power lithium-ion battery and preparation method of hierarchical porous structure carbon material
  • Hierarchical porous structure carbon material for negative electrode of power lithium-ion battery and preparation method of hierarchical porous structure carbon material
  • Hierarchical porous structure carbon material for negative electrode of power lithium-ion battery and preparation method of hierarchical porous structure carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh phenolic resin 5g and copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 19.757g (atomic ratio Cu: C=1: 4), and curing agent hexamethylenetetramine 0.7g, add 50ml absolute ethanol and stir to mix evenly, then 80 ℃ of water baths until absolute alcohol volatilizes completely, obtain red brown solid. Place it at 150° C. for 4 hours to make the thermoplastic phenolic resin fully cross-linked and solidified. Put the solidified product into a carbonization furnace, raise the temperature to 600° C. for 6 hours under the protection of nitrogen, and then cool it down to room temperature naturally to obtain a carbonized product. Add 30% H to the charred product 2 o 2 Aqueous solution, immerse the carbonized product, oxidize for 2 hours, add excess concentrated hydrochloric acid (36.8% ~ 38%), stir magnetically at room temperature for 12 hours, then suction filter and wash with deionized water until the filtrate is neutral, and dry at 80°C for 12 hours to obtain the target product ...

Embodiment 2

[0032] Operating condition is the same as embodiment 1, and difference is that copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) The mass was changed to 4.939g (atomic ratio Cu:C=1:20).

[0033] The width of the obtained carbon sheet is 5-20 μm, the thickness is about 40nm, and the specific surface area of ​​the product is 336m 2 / g, the pore volume is 0.210cm 3 / g, the micropore diameter is 0.4-2nm, the mesopore diameter is 10-50nm, and the macropore diameter is 50-200nm. Compared with the product obtained in Example 1, the proportion of mesopores decreased. The electrochemical test was carried out by the same method as in Example 1, and the results showed that the reversible capacity reached 504 mAh / g at a current density of 20 mA / g, and after 50 cycles, the capacity could be maintained at 350 mAh / g. The reversible capacity is 205mAh / g at a current density of 1A / g.

Embodiment 3

[0035] The operating conditions are the same as in Example 1, except that the carbonization process is kept at 700° C. for 6 hours.

[0036] Through transmission electron microscope analysis, the obtained product carbon sheet has a width of 5-20μm, a thickness of about 30-40nm, and a specific surface area of ​​430m 2 / g, the micropore diameter is 0.4-2nm, the mesopore diameter is 10-40nm, and the macropore diameter is 50-150nm. The charging and discharging test was carried out in the same method as in Example 1, and the results showed that the reversible capacity reached 655 mAh / g at a current density of 20 mA / g, and the capacity remained at 480 mAh / g after 50 cycles. The reversible capacity is 438mAh / g at a current density of 1A / g.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Pore volumeaaaaaaaaaa
Pore diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a hierarchical porous structure carbon material for a negative electrode of a power lithium-ion battery and a preparation method of the hierarchical porous structure carbon material; the hierarchical porous structure carbon material with controllable pore diameter is obtained through the processes of mixing of a metal source and a carbon source, solidification, carbonization and acid treatment. The technical process is simple, the material preparation cost is low, the purity is high and the controllability is high. Compared with the existing porous carbon material, the hierarchical porous structure carbon material for the negative electrode of the power lithium-ion battery has higher reversible capacity and good multiplying power performance.

Description

Technical field: [0001] The invention relates to a hierarchical pore structure carbon material for negative electrodes of power lithium-ion batteries and a preparation method thereof, belonging to the fields of electrochemistry and new energy materials. Background technique: [0002] Power batteries are power sources that provide power for tools. They have the characteristics of high voltage, high power, and large capacity. They must also have the characteristics of long cycle and long life. They are mostly used in large electric equipment such as electric vehicles, electric trains, and electric bicycles. Lithium-ion batteries have the advantages of high working voltage, large specific energy, no memory effect, and no pollution. They have been widely used in small electrical appliances such as mobile phones, digital cameras, and notebook computers. At present, the high-power research and application of lithium-ion batteries have become a hot field. Large-scale electric equip...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B31/02H01M4/583C01B32/05
CPCY02E60/12Y02E60/10
Inventor 宋怀河宋冉冉周继升陈晓红
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap