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In recent years, with the rapid development of new energy vehicle technology, all-solid-state batteries have attracted more and more attention as the next generation of power battery technology. As one of the key materials, solid electrolyte is the key to developing the next generation of high-energy, high-safety rechargeable batteries. To achieve all-solid-state batteries (ASSBs) beyond the theoretical energy density of state-of-the-art lithium-ion batteries (LiBs), a thin and robust solid electrolyte layer is essential.Solid electrolytes are mainly divided into three categories: inorganic solid electrolyte (ISEs), solid polymer electrolyte (SPEs) and composite solid polymer electrolyte (CSPEs), among which polymer solid electrolyte (SPE) has been widely studied because of its advantages of high safety, viscoelasticity, easy forming and thermal stability.
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Organic solid electrolytes are divided into organic solid polymer electrolytes and solid composite electrolytes. Common materials used for polymer solid electrolytes include: PEO, PAN, PMMA, PVDF/PVDF-HFP, and solid composite electrolytes are mainly polymer-inorganic composite electrolytes. Common preparation methods include solid phase ball milling method, sol-gel method, co-precipitation method, spray drying method, chemical vapor deposition method, among which sol-gel method commonly used preparation methods are solution pouring method, phase transformation method, in-situ polymerization method, UV curing.
1、Sol-gel method
Solution pouring method | Phase transition method | In-situ polymerization method | UV curing method | Electrospinning method |
During drying, small molecules of volatile substances cause the gel to shrink sharply and become brittle, creating small holes in the film. | Generally only applicable to polyvinylidene fluoride (PVDF) and its copolymers, other high-strength gel electrolytes can be prepared by combining the support structure. | Reactants are expensive, in situ polymerization applications of the substrate is relatively limited, most of the choice of poor thermal stability of the polymer, a small amount of use of insoluble elastomers. | The film formed by UV curing has low mechanical strength, which is not conducive to inhibiting the lithium dendrites and maintaining the safety of the battery, and needs to be combined with other polymers. | Nanofiber membrane has good electrolyte adsorption performance, uniform pore size distribution, suitable specific surface area and good liquid electrolyte compatibility. With good polymer processing ability, the technology is simple and convenient. Different material systems and composite material systems can be prepared to make the performance of the membrane more excellent. Low cost mass production can be achieved by amplifying equipment and combining multiple processes. |
2、Electrospinning - solid state composite electrolyte
Electrospinning technology has great advantages in the preparation of nanofiber materials, such as simple operation, controllable size and arrangement, and good scalability. One-dimensional nanomaterials with solid, hollow, porous, core-shell and interconnect structures can be prepared, and the thickness of electrolyte films can be reduced. The 3D supporting skeleton is provided and can be combined with other methods (gas-solid reaction, hot pressing, solution pouring, sol-gel method, etc.) to obtain composite materials with different compositions and structures, which has broad application prospects for the preparation of inorganic organic composite solid electrolytes with high performance.
Schematic illustration | |
Electrospinning + solution pouring method |
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Electrospinning + solution coating method |
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Electrospinning + calendering process |
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Electrospinning + electrospraying + hot pressing |
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Coaxial electrospinning |
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Electrospinning + electrospray + impregnation + calender |
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Conclusion: The main properties of composite solid electrolyte are determined by the composition of inorganic and organic materials. The performance of solid electrolyte can be effectively improved by the structural design of polymer matrix and inorganic filler.In addition, nanomaterials with large specific surface area and porosity provide a fast channel for ion transport, forming self-support and effectively reducing the thickness of the electrolyte film.The ionic conductivity, mechanical strength and thermal stability can be improved by adding different types of nano-inorganic fillers to the polymer matrix. | |
Our company has been ploughing into the electrostatic spinning industry for more than 20 years, the company's R&D team has more than 200 patents, more than 10,000 co-operative customers, more than 100 cases of industrialised co-operation around the world.Solid electrolyte film electrostatic spinning production line, equipment width can be selected 1.2/1.6/1.8m, stable spinning matrix materials are: PEO, PAN, PMMA, PVDF/PVDF-HFP and other polymers, fiber diameter can be controlled between 200-500nm, high production efficiency, to spin 20μm film thickness as an example, a equipment can reach 8000+㎡/ day, with considerable economic benefits.
| The spinning mode of full nozzle avoids the instability and non-uniformity of the pin-free liquid surface, greatly reduces the probability of residual points on the film surface, and the fiber diameter is narrow and controllable, and the structure is stable. Five independent control systems - rewinding system, automatic liquid supply system, temperature and humidity control system, PLC control system and 7-inch full color touch screen control system, for the stable production of equipment escort. |
Different nozzle spinning modes can be arranged along the winding direction, spinning parameters can be independently controlled, and multi-morphology and multi-component embedded network structures such as nanofiber-nanofiber, nanofiber-nanoparticle (battery inorganic material) can be obtained, which can improve the comprehensive performance of solid-state batteries from the structural design. |
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Related link: https://www.nanofiberlabs.com/product/multifunctional-electrospinning-machine-e04-001.html
