Based on co 2 Prepared si-c negative electrode material and its synthesis method and application
The technology of a negative electrode material and synthesis method is applied in the field of Si-C negative electrode material prepared based on CO2 and its synthesis. It can solve the problems that are not conducive to the effective progress and control of the reaction, so as to improve the electrochemical performance, improve the electrical conductivity, and improve the operation process. simple effect
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Embodiment 1
[0051]One based on CO2The synthesis method of the prepared Si-C negative electrode material is carried out according to the following steps;
[0052](1) Place the silicon-calcium alloy, calcium chloride, and magnesium chloride salt in a high-temperature vacuum drying furnace, and dry for 12 hours at a temperature of 300°C and a pressure of -0.1MPa to remove the adsorbed water and part of the crystal water.
[0053](2) Put 6.4g±0.1g calcium silicide, 100±0.1g calcium chloride, and 100±0.1g magnesium chloride salt in the processed silicon-calcium alloy, calcium chloride and magnesium chloride salt under the protection of argon gas. Grind in a ceramic mortar for 1 hour, mix well, put it into a ziplock bag and seal;
[0054](3) Pour the mixed salt into a crucible embedded in the reactor, and seal the reactor with a reactor cover;
[0055](4) Place the reactor in a resistance wire furnace, and introduce argon from the inlet of the reactor, and discharge argon from the outlet of the reactor to ensure...
Embodiment 1
[0062]According to the mass ratio, Si-C anode material: conductive agent acetylene black: binder PVDF=6:2:2 ratio, the Si-C anode material prepared in Example 1 with a particle size of 0.5-25 microns and conductive The acetylene black and the binder PVDF are uniformly mixed, the solvent N-methylpyrrolidone is added to prepare a slurry, and the slurry is coated on the copper foil current collector to obtain an electrode sheet.
[0063]Place the electrode sheet in a vacuum drying and dry at 80°C for 12 hours. After the electrode sheet is completely dried, the electrode sheet is punched into a disc electrode sheet with a diameter of 12 mm.
[0064]The obtained wafer electrode sheet was used as the negative electrode, the metal lithium sheet was used as the positive electrode, Celgard 2400 was used as the separator, and EC / DMC (1:1)-LiPF6 (1M) was used as the electrolyte, and the battery was assembled in a glove box.
[0065]Use the blue CT2001A battery test system to perform constant current ch...
Embodiment 2
[0067]One based on CO2The synthesis method of the prepared Si-C negative electrode material is the same as that of Example 1, except that:
[0068](1) In step (2), adjust 100g of magnesium chloride to 200g;
[0069](2) In step (5), the synthesis temperature is 700°C;
[0070]The other methods are the same.
[0071]Prepare a Si-C negative electrode material with a particle size of 0.5-20 microns, use the prepared Si-C negative electrode material as a negative electrode material for a lithium ion battery, and prepare a lithium ion battery by the method of Example 1;
[0072]After electrochemical tests, the first discharge specific capacity of the lithium-ion battery prepared is 2904.6mAh·g-1, The coulombic efficiency is 77%, with 0.1A·g-1After 400 cycles of current density, the reversible cycle specific capacity of the battery is 1276.5mAh·g-1, Coulomb efficiency remains at 99%.
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