Composite material and preparation method and application thereof
A technology of composite materials and negative electrode materials, applied in the field of material science, can solve the problems of low intrinsic conductivity of silicon, low initial Coulombic efficiency, and high production cost, and achieve good battery cycle stability, easy control of the process, and simple preparation process Effect
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[0054] The preparation method of the silicon alloy-silicon oxide negative electrode active material includes: ultrasonic chemical method, wet chemical method, mechanochemical reaction (eg mechanical alloying method and mechanical ball milling method) and the like.
[0055] In a preferred embodiment, a method for preparing a silicon alloy-silicon oxide negative electrode active material includes: using a metallurgical silicon alloy as a raw material, and preparing the target product through mechanical ball milling and high temperature calcination.
[0056] In a more specific embodiment, the preparation method may include the following steps:
[0057] (i) metallurgical iron-silicon materials providing silicon sources;
[0058] (ii) ball milling the silicon alloy;
[0059] (iii) calcining the ball-milled sample at a high temperature in a muffle furnace to obtain a silicon alloy-silicon oxide material.
[0060] Further, wet ball milling is used in the preparation method, wherein...
Embodiment 1
[0127] Example 1 Preparation of iron-silicon alloy-silicon oxide negative electrode active material (ie "iron-silicon alloy-silicon oxide material"):
[0128] 1) Weigh 2g of metallurgical iron-silicon alloy, 2g of absolute ethanol and 16g of agate grinding balls, and add them to a 100ml agate ball mill jar respectively.
[0129] 2) Put the ball mill tank into the ball mill, set the ball mill parameters, the speed is 400r / min, and the working time is 24h.
[0130] 3) Suction filtration, washing and drying of the ball-milled small particle iron-silicon alloy.
[0131] 4) Put the fine-grained iron-silicon alloy obtained by ball milling into a corundum crucible, spread it evenly, and put it into a muffle furnace for calcination at 800° C. for 3 hours.
[0132] 5) The calcined material is repeatedly washed with deionized water and ethanol, suction filtered, and finally dried to obtain an iron-silicon alloy-silicon oxide material.
[0133] The crystal phase, pore size distribution...
Embodiment 2
[0143] Example 2 Preparation of iron-silicon alloy-silicon oxide negative electrode active material (ie "iron-silicon alloy-silicon oxide material"):
[0144] 1) Weigh 2g of metallurgical iron-silicon alloy, 2g of absolute ethanol and 16g of agate grinding balls, and add them to a 100ml agate ball mill jar respectively.
[0145] 2) Put the ball mill jar into the ball mill, set the ball mill parameters, the speed is 300r / min, and the working time is 12h.
[0146] 3) Suction filtration, washing and drying of the ball-milled small particle iron-silicon alloy.
[0147] 4) Put the fine-grained iron-silicon alloy obtained by ball milling into a corundum crucible, spread it evenly, and put it into a muffle furnace for calcination at 400° C. for 3 hours.
[0148] 5) The calcined material is repeatedly washed with deionized water and ethanol, suction filtered, and finally dried to obtain an iron-silicon alloy-silicon oxide material.
[0149] The iron-silicon alloy-silicon oxide mater...
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