Graphite negative electrode material with high rate capability, preparation method thereof, and application of graphite negative electrode material in lithium ion battery
A technology of negative electrode material and graphite, applied in the field of graphite negative electrode material and its preparation, can solve problems such as poor rate performance, and achieve the effects of improving rate performance, high practicability and reducing cost
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Embodiment 1
[0033] Take by weighing natural graphite 100kg, its physical and chemical index is median diameter (D 50 ) is 25 μm, fixed carbon content 99.50wt%; take coal tar pitch (softening point 250 ℃, secondary quinoline insoluble matter content is 15%) 3kg; natural graphite and coal tar pitch are dropped into high-speed modified VC mixer, Mix at a speed of 100r / min for 100min, put it into a carbonization furnace after mixing, raise the temperature to 460°C at a heating rate of 4°C / min under a nitrogen atmosphere, and continue to heat at a heating rate of 20°C / min to 1000°C, constant temperature for 3 hours, then cool the reactant to room temperature, and then sieve through a 200-mesh vibrating sieving machine, and the obtained undersize is the negative electrode material.
Embodiment 2
[0035] Take by weighing natural graphite 100kg, its physical and chemical index is median diameter (D 50 ) is 17 μm, fixed carbon content 99.70wt%; take coal tar pitch (softening point 230 ℃, secondary quinoline insoluble matter content is 17%) 4kg; natural graphite and coal tar pitch are dropped into high-speed modified VC mixer, Mix at a speed of 80r / min for 180min, put it into a graphitization furnace after mixing, raise the temperature to 450°C at a heating rate of 3°C / min under a nitrogen atmosphere, and keep it for 3 hours, then continue at a heating rate of 25°C / min to 1200°C, keep the temperature constant for 3 hours, then cool the reactant to room temperature, and then sieve through a 300-mesh vibrating sieving machine, and the obtained undersize is the negative electrode material.
Embodiment 3
[0037] Take by weighing natural graphite 100kg, its physical and chemical index is median diameter (D 50 ) is 10 μm, fixed carbon content 99.50wt%; take by weighing petroleum pitch (softening point 250 ℃, secondary quinoline insoluble matter content is 10%) 5kg; Natural graphite and petroleum pitch are cross-dropped into high-speed modified VC mixer, Mix at a speed of 400r / min for 100min, put it into a carbonization furnace after mixing, raise the temperature to 430°C at a heating rate of 5°C / min under an argon atmosphere, keep it for 2 hours, and continue at a heating rate of 22°C / min To 1100°C, keep the temperature constant for 6 hours, then cool the reactant to room temperature, and then sieve through a 240-mesh vibrating sieving machine, and the obtained undersize is the negative electrode material.
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