A kind of silicon-based negative electrode material and preparation method thereof
A silicon-based negative electrode material, lithium silicate technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of large volume change, lower electrochemical performance of materials, lower specific capacity and conductivity of materials, etc.
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[0041] The present invention also provides a method for preparing a silicon-based negative electrode material, comprising the following steps:
[0042] A) under an inert atmosphere, heating the mixture of silicon dioxide and the first carbon source to 900-1000° C., keeping the temperature for 3-10 hours, and cooling down to obtain a heat-treated product;
[0043] B) ball milling the heat-treated product under an inert atmosphere;
[0044] C) mixing the ball-milled powder, the second carbon source and lithium silicate, and sintering in an inert atmosphere to obtain a silicon-based negative electrode material.
[0045] In the present invention, the mixture of silicon oxide and the first carbon source is first heated to 900-1000° C., kept for 3-10 hours, and then cooled to obtain a heat-treated product. The heating, heat preservation and temperature reduction all need to be carried out under an inert atmosphere.
[0046]In some embodiments of the present invention, the first ca...
Embodiment 1
[0075] The mixture of 900g of silicon oxide and 5g of glucose was raised to 950°C at a heating rate of 10°C / min, kept for 5h, and then lowered to room temperature to obtain a heat-treated product; all the above steps were carried out under an argon atmosphere;
[0076] The heat-treated product was ball-milled for 4 hours under an argon atmosphere;
[0077] Mix the ball-milled powder with 114g of pitch, 12g of lithium metasilicate, and 8g of lithium orthosilicate and then mix and ball-mill for 4 hours, and raise the ball-milled mixture to 850°C at 10°C / min in an argon atmosphere. ℃, keep it warm for 6 hours, then cool down to room temperature, pass through a 300-mesh sieve to remove iron, and obtain a silicon-based negative electrode material.
[0078] Utilize X-ray diffractometer to analyze the powder after ball milling, obtain the XRD figure of the powder after ball milling in the embodiment of the present invention 1, as figure 1 shown. figure 1 It is the XRD pattern of th...
Embodiment 2
[0084] The mixture of 900g of silicon oxide and 5g of glucose was raised to 1000°C at a heating rate of 10°C / min, kept for 3 hours, and then lowered to room temperature to obtain a heat-treated product; all the above steps were carried out under an argon atmosphere;
[0085] The heat-treated product was ball-milled for 4 hours under an argon atmosphere;
[0086] Mix the ball-milled powder with 114g of pitch, 12g of lithium metasilicate, and 8g of lithium orthosilicate and then mix and ball-mill for 4 hours, and raise the ball-milled mixture to 850°C at 10°C / min in an argon atmosphere. ℃, keep it warm for 6 hours, then cool down to room temperature, pass through a 300-mesh sieve to remove iron, and obtain a silicon-based negative electrode material.
[0087] In this example, the obtained silicon-based negative electrode material was subjected to charge and discharge experiments at 0.1C. The experimental results showed that the first Coulombic efficiency of the silicon-based neg...
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