Silicon compound negative electrode material, preparation method thereof and lithium ion battery
A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of lithium batteries, negative electrodes, battery electrodes, etc., can solve the problems that the cycle performance needs to be further improved, and achieve excellent cycle performance, high charge and discharge efficiency, and good uniformity.
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Embodiment 1
[0071] The present invention prepares the silicon composite negative electrode material according to the following method:
[0072] (1) Take 5 kg of silicon powder (D50 is 10 μm), 10 kg of silicon micropowder (D50 is 5 μm), use a VC mixer to mix for 30 minutes to obtain SiO raw materials, and put them into the vacuum furnace reaction chamber near the end of the furnace;
[0073] (2) get 2kg magnesium powder, drop into the vacuum furnace reaction chamber near one end of furnace mouth;
[0074] (3) A collector is built into the condensation chamber and heated to 1300°C under 200Pa vacuum condition to generate SiO vapor and Mg vapor in the furnace;
[0075] (4) Control the temperature of the condensation chamber to 800°C, and cool the uniformly mixed gaseous mixture in the condensation chamber for 12 hours to obtain a silicon compound. After the reaction, cool the equipment and collect 11 kg of the product;
[0076] (5) Get 5 kg of the product described in step (4), and control ...
Embodiment 2
[0084] The difference between this embodiment and embodiment 1 is that in step (4), the temperature of the condensation chamber is controlled to be 700°C. Other operations for preparing the silicon composite negative electrode material are the same as in Example 1.
[0085] The silicon composite negative electrode material prepared in this embodiment includes silicon, silicon oxide and magnesium silicate, the chemical formula of the silicon oxide is SiOx (x=0.63), and the silicon composite negative electrode material also contains carbon on the surface and in the void. The silicon composite negative electrode material has an average particle size of 5.5 μm and a specific surface area of 3.5 μm 2 / g. In the silicon composite negative electrode material, the mass fraction of oxygen element is 26%, the mass fraction of magnesium element is 8%, and the mass fraction of carbon element is 5%.
[0086] For the silicon composite negative electrode material prepared in this example...
Embodiment 3
[0088] The difference between this embodiment and embodiment 1 is that in step (4), the temperature of the condensation chamber is controlled to be 850°C. Other operations for preparing the silicon composite negative electrode material are the same as in Example 1.
[0089] The silicon composite negative electrode material prepared in this embodiment includes silicon, silicon oxide and magnesium silicate, the chemical formula of the silicon oxide is SiOx (x=0.63), and the silicon composite negative electrode material also contains carbon on the surface and in the void. The silicon composite negative electrode material has an average particle size of 5.5 μm and a specific surface area of 3 m 2 / g. In the silicon composite negative electrode material, the mass fraction of oxygen element is 26%, the mass fraction of magnesium element is 8%, and the mass fraction of carbon element is 5%.
[0090] For the silicon composite negative electrode material prepared in this example, a...
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Abstract
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