Silicon carbon composite material, lithium ion battery and negative pole piece thereof
A technology of lithium ion batteries and composite materials, applied in the battery field, can solve the problems of easy formation of lithium dendrites, large volume expansion, low lithium insertion potential, etc., and achieve the effects of reduced expansion rate, long service life and excellent electrical conductivity.
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[0028] The preparation process of the lithium-ion battery in the foregoing embodiments is as follows:
[0029] Step 1, preparing positive pole piece, negative pole piece and diaphragm bag;
[0030] Step 2. Put the negative pole piece into the diaphragm bag, and stack several diaphragm bags with the negative pole piece neatly together, so that the tabs of all the negative pole pieces are on one side of the battery;
[0031] Step 3. Insert the positive pole piece between two adjacent diaphragm bags, and make the tabs of all positive pole pieces on the other side of the battery;
[0032] Step 4. Paste a single-sided positive pole piece on the outside of the diaphragm bag at both ends, so that the side of the single-sided positive pole piece coated with positive electrode material is attached to the diaphragm bag, and the ear of the single-sided positive pole piece is in contact with the diaphragm bag. The tabs of the positive pole piece are on the same side to obtain a lithium-i...
Embodiment 1
[0039] Step 1, prepare graphene:
[0040] Add 10 grams of graphite powder to 250 milliliters of sulfuric acid with a concentration of 98%, and add 30 grams of potassium permanganate to form a mixed solution under the condition of cooling in an ice-water bath, stir for 2 hours, and then place the mixed solution in a water bath at 95±2°C Add 1000 milliliters of deionized water to the above mixture, and then add 50 milliliters of 30% hydrogen peroxide to react for 10 minutes after the mixed solution is naturally cooled to room temperature to generate a bright yellow graphite oxide precipitate, see Figure 7 , Figure 7 It is a schematic diagram of the appearance of graphite oxide in this embodiment; the precipitate is washed with 1 mol / liter of hydrochloric acid until there is no sulfate ion in the filtrate; the washed precipitate is dried, and then placed in a muffle furnace at 1000°C , and heat treatment for 30 seconds in a nitrogen protective atmosphere to remove oxygen-conta...
Embodiment 2
[0050] The first step is the same as in Example 1.
[0051] Second step, in 2000 milliliters, concentration is the hydrochloric acid solution of 0.05 mol / liter, add 0.5 gram above-mentioned graphene powder of preparation, stir 36 hours, ultrasonic dispersion 5 minutes, form uniform monolayer dispersed graphene solution; Add 0.1 g of silicon nanowires to the layer-dispersed graphene solution, stir mechanically for 30 minutes, then put the mixed solution into a spherical ball mill, add 500 g of zirconium balls with a particle size of 0.5-10 mm, and ball mill for 4 hours to form a stable suspension solution, the stable suspension solution was filtered to obtain the precipitate, the precipitate was washed with deionized water three times, and then the precipitate was dried in a vacuum environment at 60°C to obtain a silicon-carbon composite material, which has a stacked microstructure .
[0052] Performance Testing
[0053] (1) Test of reversible specific capacity and first effi...
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