Solid polymer electrolyte, solid lithium ion battery
A solid polymer and electrolyte technology, applied in the field of solid polymer electrolyte and solid lithium ion battery, can solve the problem of incompatibility of positive electrodes, and achieve coordination effect and high mobility, high specific capacity and high oxidation stability. Effect
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Embodiment 1
[0051] In this example, a copolymer was synthesized wherein the polymerized monomers included vinylene carbonate, polyethylene glycol methacrylate, and glycidyl acrylate.
[0052] The specific synthesis steps are as follows: 0.162g AIBN, 8g vinylene carbonate, 2.819g polyethylene glycol methacrylate and 0.254g glycidyl acrylate are dissolved in 2.120g THF and 7.48g hexane in the glove box , the mixture was stirred and allowed to polymerize slowly at 80 °C for several days. After a few days, the reaction was cooled to room temperature and the solid product was precipitated with hexane and dried overnight in a hot vacuum oven, which gave a 72% yield. Here, 10% product solutions were prepared in DMSO for viscosity measurements.
[0053] The infrared spectrum of the copolymer synthesized by this embodiment is as figure 2 shown. From figure 2 It can be seen that on the infrared spectrum of the polymer (Copolymer) formed by free radical copolymerization of vinylene carbonate, ...
Embodiment 2
[0056] In this example, the copolymer synthesized in Example 1 was prepared into a film.
[0057] The specific film-forming step is to punch a hole on the disk and put it into a button battery to face the stainless steel gasket. First, the copolymer and LiTFSI salt are mixed according to a series of different molar ratios (such as 95:5, 90:10, 80:20, 70:30, 60:40, 55:45, 45:55, 40:60, 20:80, 10:90), dissolved in a mixed solvent of THF and DMSO and cast into a film, and then every 1.5 Add 1 drop of 40-fold diluted diamine solution to mL of the mixed solution, and set a wet gap of 400 microns on the casting blade, and finally place it in a vacuum oven to dry overnight. After drying, a film with a thickness of 100 microns can be obtained. In this way, it is possible to test the lithium conductivity of the film cast on aluminum foil, the 180° peel strength test obtained by 3M adhesive tape, the oxidation stability test and the volt-ampere cycle characteristic test.
[0058] The f...
Embodiment 3
[0063] In this embodiment, the EIS impedance test is carried out on the PEO membrane on the aluminum foil, the PVDF membrane and the solid polymer electrolyte membrane containing the copolymer in Example 2, wherein the observation is carried out every hour at 60 degrees Celsius for 4 days test.
[0064] The EIS spectrum tested by this embodiment is as Figure 8 shown. From Figure 8 It can be seen that the total resistance of the solid polymer electrolyte membrane containing the copolymer is much lower than that of the similar PEO membrane or PVDF membrane, which indicates an improved interface between the solid polymer electrolyte membrane and the lithium foil. It is worth noting that PEO is very unstable to lithium foil, while PVDF shows excellent stability; and, the EIS resistance increases slightly over time, which may be due to the solid polymer electrolyte membrane / lithium interface. roughen.
[0065] Before and after carrying out the impedance test in this embodimen...
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Abstract
Description
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