A preparation method of composite modified lithium battery negative electrode material for lithium battery
A negative electrode material and lithium battery technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve problems such as low specific capacity and large irreversible capacity loss, and achieve high softening point and improved Migration speed, effect of shortening reaction time
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Embodiment 1
[0021] A method for preparing a composite modified lithium battery negative electrode material for a lithium battery, comprising the following steps:
[0022] (1) Graphene and carbon nanotubes with a mass ratio of 1:1 are put into the solvent, and after being preliminarily pulverized by ultrasonic waves, they are mixed and stirred at room temperature for 4 to 6 minutes, and then mixed and stirred for 4 to 6 minutes under the protection of inert gas. Raise the temperature at a rate of ℃ / min to 40-60 ℃, keep it warm for 4-6 hours, and then cool it down to room temperature naturally to obtain a mixed solution;
[0023] (2) Using petroleum asphalt as the base material, crushing and ball milling the base material until the particle size is 120-140um, and then putting the treated particles into the reactor for modification treatment, the steps include:
[0024] (2.1) Nitrogen gas is introduced at a space velocity of 80-120 hours per hour, and then the temperature is raised to 300-42...
Embodiment 2
[0034] The content of this embodiment is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that the step (1) puts graphene and carbon nanotubes with a mass ratio of 1.5:1 into the solvent, and passes After ultrasonic primary pulverization treatment, mix and stir at room temperature for 4-6 minutes, then raise the temperature to 40-60°C at a rate of 2-4°C / min under the protection of inert gas, keep it warm for 4-6 hours, and then cool naturally to At room temperature, a mixed solution was obtained.
Embodiment 3
[0036] The content of this embodiment is basically the same as that of Example 1, and the similarities will not be repeated. The difference is that the step (1) puts graphene and carbon nanotubes with a mass ratio of 2:1 into the solvent, and passes After ultrasonic primary pulverization treatment, mix and stir at room temperature for 4-6 minutes, then raise the temperature to 40-60°C at a rate of 2-4°C / min under the protection of inert gas, keep it warm for 4-6 hours, and then cool naturally to At room temperature, a mixed solution was obtained.
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