Negative electrode material, preparation method of the negative electrode material, manufacturing method of negative electrode plate, and lithium ion battery
A negative electrode material and manufacturing method technology, applied in the field of negative electrode materials and its preparation, and lithium-ion batteries, can solve problems such as easy agglomeration, volume expansion, and affecting the charging and discharging efficiency of lithium-ion batteries
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[0071] The application provides a method for preparing a negative electrode material, which is characterized in that, comprising:
[0072] S1: Add solid nano-silicon to the first copper salt aqueous solution, and carry out dispersion treatment. Ultrasonic dispersion treatment can be selected, and then drop the first reducing agent solution for reduction reaction to activate nano-silicon, followed by suction filtration and washing. Formation of activated nano-silicon particles;
[0073] S2: adding the activated nano-silicon particles into the second copper salt solution, and then dripping the reducing agent solution for electroless copper plating, followed by suction filtration and washing to form alloyed nano-silicon;
[0074] S3: placing the alloyed nano-silicon in an inert gas environment, passing through a gaseous carbon source for vapor deposition, and then cooling to form a negative electrode material.
[0075] In the preparation method of the above-mentioned negative el...
Embodiment 1
[0113] A method for preparing a negative electrode sheet, comprising:
[0114] Step 1: Activation of nano-silicon: Take 10g of nano-silicon and add it to the copper sulfate aqueous solution with a concentration of 3g / L, carry out stirring and ultrasonic dispersion treatment for 15 minutes, and add an appropriate amount of NaBH4 aqueous solution with a concentration of 5g / L to carry out the reduction reaction, and the reaction is completed Suction filtration is then carried out, and the solid after suction filtration is added into dilute nitric acid solution, soaked and pickled to activate nano-silicon particles, and activated nano-silicon particles are obtained.
[0115] Step 2: Copper plating on nano-silicon: Add 10 g of activated nano-silicon particles to a copper sulfate aqueous solution with a concentration of 10 g / L, stir and ultrasonically disperse at 600 rpm for 2 hours, and transfer the mixed solution of ultrasonically dispersed to a round-bottomed flask , under the pr...
Embodiment 2
[0120] The difference from Example 1 is that the concentration of the first copper salt solution is 7g / L, the concentration of the first reducing agent solution is 10g / L, and the concentration of the second copper salt solution is 15g / L, and the step S2 is stirred and ultrasonically dispersed. The time of heating is 0.5 hour, the concentration of the second reducing agent solution is 10g / L, the heating time of the water area is 10 minutes, the gas carbon source is methane, and the proportion of SBR in the binder is 3%.
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