Preparation method of solid high-molecular electrolyte and its application
A polymer electrolyte, solid-state technology, applied in the field of alkaline solid film polymer electrolyte, can solve problems such as poor mechanical strength
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Embodiment 1
[0069] Accurately weigh 8.0g of polyvinyl alcohol PVA, and put 40g of water into the reactor. This is weighed and recorded along with the reactor PVA, water and stir bar. Stir at room temperature for 1 hour to dissolve completely. 12.5 g of potassium hydroxide (KOH) was dissolved in 10 g of water and poured into the reactor. The temperature of the reactor is raised to 60-70° C., and the polymerization time is controlled within 30 minutes. Record the finished reactor and the polymer inside, and spread the viscous polymer solution on glass fiber (GF) cloth with a fixed weight (about 5-10g of polymer solution), and place it at a constant temperature. In a humidity chamber (controlled at a humidity of 30-40RH%, and a temperature of 50-60° C.) for 1 hour. Take it out and place it in the atmosphere for 30 minutes to 1 hour, take off the polymer film and weigh it to calculate its chemical composition ratio after drying, and store it in a zipper belt for electrochemical characteris...
Embodiment 2
[0071] Get the obtained PVA-GF macromolecule film of embodiment 1, measure film thickness with digital thickness meter, and measure its ionic conductivity with the AUTOLAB FRA (bipolar stainless steel electrode) of electrochemical impedance analyzer Eco Chemie BV, (referring to figure 4(a), Figure 4(b)), its composition PVA: KOH: H 2 The ratio of O is 30:30:40% by weight, the molecular weight (MW) of PVA is 75,000-80,000, and the thickness is 0.58 millimeter (mm) or 0.6 millimeter (mm).
[0072] The cyclic voltammogram was measured with AUTOLAB FRA (made from the Netherlands), as shown in Figure 6(a) and (b). From the cyclic voltammogram scanned in Fig. 6, it can be seen that the polyvinyl alcohol polymer electrolyte obtained in this example is compared with the PVA-glass fiber electrolyte film at normal temperature, and it is found that the polyethylene-glass fiber electrolyte film of the present invention has a stable operating voltage in the range of There is no oxidation ...
Embodiment 3
[0075] Weigh 2.5g containing 70wt% zinc powder, PTFE, KOH, make zinc gel (zinc gel) as the negative electrode, use PP / PE separator and cellulose separator respectively, and use the self-prepared air electrode as the positive electrode , assembled into a zinc-air battery, while taking the PVA-glass fiber film electrolyte of Example 1 to replace the above-mentioned PP / PE and cellulose separator, and assembled into a zinc-air battery for electrical discharge comparison (refer to Table 4). The theoretical capacity of the battery is 1,500mAh. At room temperature, discharge with 50mA, 100mA, 150mA, 200mA current, the results are shown in Figure 8 (a), (b), (c). According to Figure 8(a), the zinc-air battery made of PP / PE as the separator is discharged at the rate of C / 10, and the discharge time is 8.9 hours, and the utilization rate reaches 89.33%. And the zinc-air battery with cellulose as separator, discharge time is 8.1 hours, and its utilization rate only has 81%, but the zinc-...
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