Conductive material for solid-state battery anode, preparation method thereof, and anode composite material prepared therewith
A solid-state battery and conductive material technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, negative electrodes, etc., can solve the problems of low structural strength and increased electrode resistance, improve cycle performance, strengthen structural strength and toughness, avoid The effect of increasing the internal resistance of the negative electrode
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Embodiment 1
[0055] Solid-state batteries usually use lithium foil as the negative electrode. Lithium foil will gradually separate from the solid electrolyte particles during the continuous dissolution-deposition reaction, resulting in increased internal resistance, and when lithium foil is used, the solid-state battery still has the possibility of short circuit; Therefore, a three-dimensional conductive carbon composite solid electrolyte can be used as the negative electrode composite material. Lithium is uniformly deposited on the surface of the conductive carbon, and the contact surface with the solid electrolyte increases; when the solid electrolyte is mixed with the conductive carbon, mechanical mixing is usually used. The contact of electrolyte particles is physical direct contact. When lithium metal is deposited on the surface of conductive carbon, there is still a small amount of volume expansion, which will cause the carbon material to fall off from the surface of the solid electrol...
Embodiment 2
[0090] A method for preparing a composite negative electrode of an inorganic solid-state battery, comprising the following steps:
[0091] Step S1 prepares the conductive material for the solid-state battery negative electrode, step S2 prepares the negative electrode composite material, and step S3 prepares the solid-state battery composite negative electrode with the negative electrode composite material;
[0092] S1. Using a coupling agent to modify the surface of the conductive carbon material;
[0093] Weigh 12g of isopropyl tris(dioctylpyrophosphate acyloxy) titanate KR-38s coupling agent and dissolve it in 83g of absolute ethanol, fully stir for 30min, then add 5g of deionized water and stir at high speed , the rotation speed is 1000 r / min, the dispersion time is 20 minutes, then 2.1 g of carbon nanotubes are added and fully dispersed for 1 hour, the excess liquid is removed by suction filtration and washing, the drying temperature is 80 ° C, and the modified carbon nano...
Embodiment 3
[0097] A method for preparing a composite negative electrode of an inorganic solid-state battery, comprising the following steps:
[0098] Step S1 prepares the conductive material for the solid-state battery negative electrode, step S2 prepares the negative electrode composite material, and step S3 prepares the solid-state battery composite negative electrode with the negative electrode composite material;
[0099] S1. Using a coupling agent to modify the surface of the conductive carbon material;
[0100]Weigh 20g of γ-aminopropyltriethoxysilane kh550 silane coupling agent and dissolve in 75g of absolute ethanol, fully stir for 30min, then add 5g of deionized water and stir at a high speed, the speed is 2000 r / min, Dispersion time 30min. Then add 2.05g of carbon nanofibers and fully disperse for 1h, filter and wash to remove excess liquid, vacuum dry at 80°C, and obtain modified carbon nanofibers after drying; modified carbon nanotube materials, after burning in air Residue...
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