Synthetic method for MCMBs (mesocarbon microbeads) with controllable particle sizes

A technology of mesocarbon microspheres and synthesis methods, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of satisfactory industrialization, uneven product particle size, complex reaction conditions, etc. The effect of low cost, good performance and simple process

Inactive Publication Date: 2013-09-04
CHINA NAT OFFSHORE OIL CORP +2
View PDF3 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Judging from the current situation, the existing technologies have not achieved satisfactory results from the perspective of industri

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Get 2 g of ferrocene, 2 g of artificial graphite, and 2 Kg of coal tar pitch into a 2 L reaction kettle, seal and stir, heat to 410 ° C and keep warm for 0.1 h, after natural cooling, wash with oil washing solvent and then centrifugally filter . The product obtained above was carbonized at 1000 °C for 1 h.

[0017] The particle size of the obtained mesophase carbon microspheres D 50 It is (23±2) μm, the tested reversible capacity is 346 mAh / g, and the first efficiency is 94.8%; the final product mass is 627.2 g, and the yield is 31.4%.

Embodiment 2

[0019] Take 20 g of nickelocene, 20 g of natural graphite, and 2 Kg of coal tar pitch into a 2 L reaction kettle, seal and stir, heat to 480 ° C and keep it warm for 4 h, after natural cooling, wash with oil washing solvent and then centrifugally filter . The product obtained above was carbonized at 1500 °C for 10 h.

[0020] The particle size of the obtained mesophase carbon microspheres D 50 It is (8±2) μm, the tested reversible capacity is 320 mAh / g, and the initial efficiency is 93.6%; the final product mass is 502.4 g, and the yield is 25.1%.

Embodiment 3

[0022] Take 10 g of cobalt dicene, 5 g of artificial graphite, and 2 Kg of coal tar pitch into a 2 L reactor, seal and stir, heat to 420 °C and keep it warm for 3 h, after natural cooling, wash with washing oil solvent and then centrifugally filter. The product obtained above was carbonized at 1100 °C for 4 h.

[0023] The particle size of the obtained mesophase carbon microspheres D 50 It is (12±2) μm, the tested reversible capacity is 328 mAh / g, and the first efficiency is 93.9%; the final product mass is 560.4 g, and the yield is 28.0%.

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

No PUM Login to view more

Abstract

The invention provides a synthetic method for MCMBs with controllable particle sizes. The synthetic method is characterized by comprising the following steps: step one, coal tar pitch, graphite after grinding and sieving, and a quantitatively weighed catalyst are added into a reaction still, wherein the mass ratio of the graphite to the coal tar pitch is (1:1,000)-(1:100), the catalyst comprises one or more of ferrocene, cobaltocene, nickelocene, ferric chloride and iron oxide, and the mass ratio of the catalyst to the coal tar pitch is (1:1,000)-(1:100); the mixture is sealed, stirred, heated and thermally insulated, the heating temperature is 410 DEG C-480 DEG C, and the thermal insulation is performed for 0.1-4 hours; after natural cooling, the mixture is heated and washed cleanly by a wash oil solvent, and is subjected to centrifugal filtration; step 2, the product of the step one is carbonized, the carbonizing temperature ranges from 1,000 DEG C to 1,500 DEG C, and the thermal insulation time is 1-10 hours; and step three, the product of the step two is subjected to graphitization treatment, and the graphitization temperature ranges from 2,500 DEG C to 3,000 DEG C.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a method for synthesizing mesophase carbon microspheres with controllable particle diameters in lithium-ion battery negative electrode materials. Background technique [0002] Mesophase carbon microspheres (MCMB) are a kind of anode material for lithium-ion batteries. MCMB is a typical soft carbon, showing a nearly ideal spherical shape, a high degree of graphitization, and a high reversible capacity. The nearly perfect lithium ion intercalation-deintercalation channel in its structure makes this material have high-rate charge and discharge performance unmatched by other negative electrode materials. At the same time the right amount of SP in the structure 3 The presence of the bonds makes the material exceptionally stable, thus exhibiting an exceptionally long cycle life. At the same time, the price of the material is moderate, with high cost performan...

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): C01B31/04C01B32/205
Inventor 刘庆华刘红光叶学海张波宫毓鹏孙国娟
Owner CHINA NAT OFFSHORE OIL CORP
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