Solid-state anode composite material and preparation method thereof, and application of solid-state anode composite material
A technology of composite materials and negative active materials, applied in the direction of composite electrolytes, battery electrodes, solid electrolytes, etc., can solve problems such as hindering lithium ion transmission, difficult ion transmission, large interface impedance, etc., to improve interface compatibility and stability , broad application prospects, good processing performance
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[0147] see figure 2 As shown, another aspect of the embodiments of the present invention also provides a method for preparing a solid negative electrode composite material, which includes:
[0148] Spraying a polymer solution (which may be referred to as solution 1) onto a selected receiving surface using electrospinning technology to form a continuous two-dimensional or three-dimensional structure, the organic fiber material having at least the function of an ion conductor;
[0149] While spraying the polymer solution, the dispersion liquid of the negative electrode active material or the mixed dispersion liquid of the negative electrode active material and the electronic conductor additive and / or the inorganic ion conductor additive (which may be referred to as solution 2) is sprayed onto the polymer solution by electrostatic spraying technology. The selected receiving surface, and then pressurize the obtained composite material, so that the negative electrode active materi...
Embodiment 1
[0200] About 1 g of commercially available polyacrylonitrile (PAN) powder was dissolved in about 10 g of N,N-dimethylformamide (DMF) to obtain a polyacrylonitrile solution. Add about 1 g of commercially available nano-silicon powder and 0.14 g of commercially available acetylene black into about 20 g of ethanol containing about 1 wt % surfactant and stir to disperse to obtain a mixed dispersion of nano-silicon and acetylene black. Under the high pressure of about 20KV, spinning and spraying are carried out side by side in a parallel manner simultaneously, and the distance between the two needles and the drum receiver is about 10 cm, and the flow rate of the polyacrylonitrile solution in the spinning needle is about 10 μl / min, and in the spraying needle The flow rate of the mixed dispersion is about 70 μl / min. After working like this for about 10 hours, a piece of flexible solid negative electrode film can be peeled off from the roller receiving device, and then rolled at about ...
Embodiment 2
[0202] About 1 g of commercially available polytetrafluoroethylene (PTFE) was dissolved in about 10 g of ethanol to obtain a polytetrafluoroethylene solution. About 1g of commercially available manganese oxide powder with a particle size of about 400nm and about 0.14g of commercially available acetylene black were added to about 20g of ethanol containing about 1wt% surfactant and stirred and dispersed to obtain a negative electrode carbon material mixed dispersion. Spinning and spraying are carried out at the same time under a high pressure of about 20KV, the distance between the two needles and the drum receiving device is about 10cm, the flow rate of the polytetrafluoroethylene solution in the spinning needle is about 5μl / min, and the inorganic negative electrode carbon material in the spraying needle The flow rate of the mixed dispersion is about 250μl / min. After working like this for about 30 hours, a flexible solid negative electrode film can be peeled off from the roller ...
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