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Experimental method for preparation of silicon carbon composite materials for lithium-ion batteries

We use solution plasma treatment (SPP) to detect the composition of silicon CB composite materials. The results indicate that SPP method is an excellent method for preparing carbon black with medium to micro layered pore structure and high pore volume. 0-22)

In these studies, only organic solvents such as benzene were used to form CB. However, in this study, we detected the composition of the composite material by relaxing silicon nanoparticles in an organic solvent before plasma discharge.

The experiment was conducted at room temperature and pressure. A pair of mechanical pencil leads are used as electrodes for plasma generation, as most metal wires are sputtered or evaporated by plasma, indicating the presence of impurities in the composite material.

Each electrode is covered with a ceramic tube, which is inserted into a silicone plug. Encapsulate a pair of electrodes in a ceramic tube, insert a silicon plug, and then place the silicon plug into a beaker with a diameter of 50mm and a height of 100mm (Figure 1). The distance between the electrodes is kept at 1mm. The carbon precursor is pure xylene (reagent grade, sigma aldrich), and silicon nano Rice noodles (uniform particle size=100nm, AlfaAesar) is mixed with xylene. Bipolar pulse power supply is used for discharging. Adjust the power frequency and pulse width to 25kHz and 0.5s respectively. After discharge, the discharge solution is filtered through glass fiber paper to obtain any solid compounds present in the solution. Then filter it, and at 80c it becomes monotonous, leaving behind a powdery substance.

Xylene transpiration. In order to obtain positive conductivity, the obtained powder was treated in an N2 atmosphere at 700 ℃ for 1 hour in an electric furnace. In order to perform electrochemical evaluation on silicon CB composite materials, an anode was prepared using silicon CB composite materials (mass fraction of 80wt%) as the active material CB slurry.

(10% component; superp) is used as a conductive agent, and poly (acrylic acid) (PAA; 10%) is used as a binder in distilled water.

The CR2032 coin type battery is assembled in an argon filled glove box, with 2400 Celgard as the separator, lithium foil as the counter electrode and reference electrode, and 1MLiPF6 as the polycarbonate vinyl=diethyl carbonate (EC=DEC) (1:1 volume). Fluoroethylene carbonate (FEC) containing 10% components is used as the electrolyte. At a current density of 1 ℃ (Li=Li+), all cells were detected between 0.05~3V.

[372mah=g; Use the biological BCS805 battery detection system to charge (lithium extraction) and discharge (lithium thrust) at room temperature.

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