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

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...

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 industrialization, and generally have disadvantages such as low yield, high cost, uneven product particle size, and complicated reaction conditions.