Core-shell structured carbon for cathode material of lithium ion battery and preparation method thereof
A lithium-ion battery, core-shell structure technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems that limit the large-scale application of lithium-ion batteries, poor current collector adhesion, low Coulombic efficiency, etc., to achieve superior The effect of power performance, low cost, and high Coulombic efficiency
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[0031] Example 1
[0032] Use coal tar pitch as soft carbon precursor material, according to m 煤焦油沥青 : m 硬碳 = 1:100, weigh 2 g of coal tar pitch and 200 g of hard carbon material. The coal tar pitch was dissolved with toluene as a solvent, then a hard carbon material was added for ultrasonic dispersion for 0.5 h, dried, and the hard carbon surface was coated with the coal tar pitch. The obtained material was put into a tube furnace, heated to 1500 °C at a heating rate of 10 °C / min under the protection of argon, and kept at a constant temperature for 5 hours to ensure that a soft carbon shell layer was formed on the hard carbon surface after the coal tar pitch was carbonized, and cooled naturally to obtain a core. Shell structure carbon material.
[0033] Take 50.0g of core-shell carbon material, add 5.0g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture uniformly into a slurry, and bake it to half dry according to the battery plate manufactur...
Example Embodiment
[0034] Example 2
[0035] Using petroleum pitch as soft carbon precursor, according to m 石油沥青 : m 硬碳 = 1:80, weigh 2 g of petroleum pitch and 160 g of hard carbon material. The petroleum pitch and the hard carbon material were ultrasonically dispersed in p-xylene for 2 h, dried, and the surface of the hard carbon material was coated with a soft carbon precursor. The obtained material was put into a tube furnace, heated to 1000 °C at a heating rate of 10 °C / min under argon protection and kept at a constant temperature for 5 hours to ensure that a soft carbon shell layer was formed on the hard carbon surface after carbonization of the petroleum pitch, and naturally cooled to obtain a core-shell Structural carbon material.
[0036]Take 50.0g of core-shell carbon material, add 5.0g of PVDF as a binder, add N-methyl-2-pyrrolidone dropwise to mix the above mixture uniformly into a slurry, and bake it to semi-dry according to the battery manufacturing process. It is pressed on th...
Example Embodiment
[0037] Example 3
[0038] Using petroleum pitch as soft carbon precursor, according to m 石油沥青 : m 硬碳 = 10:100 relationship, weigh 2 g of petroleum pitch and 20 g of hard carbon material. The petroleum pitch and hard carbon material were ultrasonically dispersed in toluene for 2 h, dried, and coated with a layer of soft carbon precursor on the surface of the hard carbon. The obtained material was put into a tube furnace, heated to 900°C at a heating rate of 5°C / min under argon protection and kept at a constant temperature for 2 hours to ensure that a soft carbon shell layer was formed on the surface of the hard carbon after carbonization of the petroleum pitch, and cooled naturally to obtain a core-shell Structural carbon material.
[0039] Take 50.0g core-shell carbon material, add 5.0g styrene-butadiene rubber as a binder, add anhydrous ethanol dropwise to mix the above mixture uniformly into a slurry, and press it on copper foil according to the battery manufacturing proc...
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