Preparation method of graphene-polypyrrole-lithium titanate composite lithium battery negative electrode material
A battery negative electrode and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor tightness of the coating layer on the surface of lithium titanate, high contact resistance, etc., to improve electrical conductivity and electrochemical performance , Energy saving and environmental protection technology, the effect of reducing contact resistance
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Embodiment 1
[0020] Dissolve 20mL of pyrrole monomer in 200mL of absolute ethanol, add 2.5g of graphene to it, and disperse it ultrasonically at room temperature to obtain a uniform mixture a. Mix 80g of lithium titanate powder and sodium dodecylbenzenesulfonate Add 2.5g into solution a, obtain mixed solution b after ultrasonic dispersion, transfer solution b to ice-water bath and stir, keep the temperature at 0°C, then add 30g ferric chloride into solution b, keep stirring, and react for 3 hours Stop stirring. The reaction product was filtered and washed, placed in a vacuum drying oven, and baked at 100°C for 10 hours to obtain a graphene-polypyrrole-lithium titanate composite lithium battery negative electrode material.
Embodiment 2
[0022] Dissolve 20mL of pyrrole monomer in 200mL of deionized water, add 3.0g of graphene to it, and ultrasonically disperse at room temperature to obtain a uniform mixed solution a. Add 75g of lithium titanate powder and 1.5g of sodium p-toluenesulfonate to the solution In a, the mixed solution b was obtained after ultrasonic dispersion, and the solution b was stirred in an ice-water bath, and the temperature was kept at -2°C, and then 25g of hydrogen peroxide (27.5%) was added to the solution b, kept stirring, and stopped stirring after 5 hours of reaction . The reaction product was filtered and washed, placed in a vacuum drying oven, and baked at 80° C. for 20 hours to obtain a graphene-polypyrrole-lithium titanate composite lithium battery negative electrode material.
Embodiment 3
[0024] Dissolve 20mL of pyrrole monomer in 200mL of acetonitrile, then add 3.0g of graphene to it, and ultrasonically disperse at room temperature to obtain a uniform mixed solution a. Add 75g of lithium titanate powder and 1.5g of sodium benzenesulfonate to solution a , after ultrasonic dispersion, the mixed solution b was obtained, and the solution b was stirred in an ice-water bath, and the temperature was kept at 3°C, and then 20 g of ammonium persulfate was added to the solution b, kept stirring, and stopped stirring after 8 hours of reaction. The reaction product was filtered and washed, placed in a vacuum drying oven, and baked at 140° C. for 5 hours to obtain a negative electrode material for a graphene-polypyrrole-lithium titanate composite lithium battery.
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