A kind of in-situ composite lithium battery negative electrode material and its preparation method and application
A negative electrode material, in-situ composite technology, applied in the field of materials, can solve the problems of material detachment, poor contact between the negative electrode active material and the solid electrolyte material, etc., to achieve the effect of improving safety performance, avoiding side reactions, and improving efficiency in the first week
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[0056] The preparation method of the negative electrode material of the in-situ composite lithium battery provided by this embodiment, its steps are as follows image 3 shown, including:
[0057] Step 210, weighing the lithium battery negative electrode active material and solid electrolyte synthesis raw materials as required, and fully mixing them to obtain a mixture;
[0058] Specifically, liquid phase mixing or solid phase mixing can be used for mixing.
[0059] The specific process of liquid phase mixing includes: dispersing the lithium battery negative electrode active material and the solid electrolyte synthesis raw material in the solvent according to the mass ratio, and after mixing thoroughly, the mixture is obtained by blow drying, vacuum drying, spray drying and other means;
[0060] The specific process of solid-phase mixing includes: weighing the lithium battery negative electrode active material and the solid electrolyte synthetic raw material according to the m...
Embodiment 1
[0078] The silicon oxide material and the solid electrolyte material Li 7 La 3 Zr 2 o 12(LLZO) synthetic raw materials lithium carbonate (average particle size 100nm, purity 99.8%), zirconia (average particle size 100nm, purity 99.99%), alumina (average particle size 50nm, purity 99.9%) , Lanthanum oxide (average particle size is 100nm, purity is 99.9%) mixed in a high-speed VC machine, the speed is 400rpm, the time is 2 hours, the dispersion solvent is isopropanol, after mixing evenly, bake in an oven at 80°C for 24 hours. Add the uniformly mixed and baked materials into the fusion machine, adjust the rotation speed to 300rpm, the width of the tool gap to 0.5cm, the fusion time to 60mins, the fusion temperature to room temperature 100°C, and the fusion atmosphere to be fused under the conditions of dry air. A fusion product was obtained. The fusion product was placed in a box furnace, and the temperature was raised from room temperature to 900° C. at a rate of 3° C. / min u...
Embodiment 2
[0082] Lithium carbonate (average particle size: 100nm, purity 99.8%), zirconia (average particle size: 100nm, purity: 99.9%), alumina (average particle size: 100nm, purity is 99.9%), tantalum oxide (average particle size is 100nm, purity is 99.9%) utilizes planetary ball mill to carry out mixing, rotating speed 300rpm, time is 24 hours, dispersion solvent is isopropanol, mixing temperature is room temperature. After mixing evenly, bake in an oven at 80°C for 24 hours. Add the uniformly mixed and baked materials into the fusion machine, adjust the speed to 600rpm, the width of the tool gap to 0.1cm, the fusion time to 30mins, the fusion temperature to room temperature 100°C, and the fusion atmosphere to be fused under the conditions of dry air. A fusion product was obtained. The fusion product was placed in a box-type furnace, and the temperature was raised from room temperature to 900° C. at a rate of 3° C. / min under an air atmosphere, and kept for 5 hours. After heat treat...
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