A polymer electrolyte with water scavenging function and its application
An electrolyte and polymer technology, applied in non-aqueous electrolytes, non-aqueous electrolyte batteries, solid electrolytes, etc., can solve the problems of limited water removal capacity and low additive content, and achieve stable cycle performance, dendrite suppression, and high conductivity Effect
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Embodiment 1
[0043] The raw material ratio used to prepare the solid electrolyte is shown in Table 1, and the LiTFSI / DMC solution was prepared in a glove box filled with argon. Will Add acrylonitrile and acrylonitrile to the above solution, and add the initiator AIBN. After it is completely dissolved, inject the solution into a lithium-ion battery containing positive and negative electrode materials, and place it at 60°C for in-situ polymerization. After 8 hours, the required In-situ polymerized solid electrolytes.
[0044] Table 1:
[0045]
[0046] The electrolyte obtained from the above examples has high ionic conductivity, wide electrochemical window and high tensile strength (Table 1). Use the above-mentioned electrolyte to assemble a lithium battery, and use the above-mentioned obtained electrolyte and water to obtain an electrolyte with a water content of 300 or 1100 ppm to assemble an NCM622 / Li metal battery. The capacity retention rates after 100 cycles at an operating volta...
Embodiment 2
[0048] The ratio of raw materials used to prepare the solid electrolyte is shown in Table 2. In a glove box full of argon, the LiPF 6 Dissolve in EC and wait until it is stirred evenly for later use. Will and methyl methacrylate were dissolved in the above solution, and the initiator was added. After completely dissolving, the solution was injected into a lithium-ion battery containing positive and negative electrode materials, and placed at 70°C for in-situ polymerization. After 8 hours, the obtained In-situ polymerized solid electrolytes are required.
[0049] Table 2:
[0050]
[0051] The electrolyte obtained from the above examples has high ionic conductivity, wide electrochemical window and high tensile strength (Table 2). The above-mentioned electrolytes containing 100 and 600 ppm water were assembled into NCM811 / lithium metal batteries, and the capacity retention rates were 86% and 84% after 100 cycles at operating voltages of 2.3-4.4V and 0.5C ( figure 2 ); a...
Embodiment 3
[0053] The ratio of raw materials used to prepare the solid electrolyte is shown in Table 3. In a glove box full of argon, the Vinylene carbonate and LiDFOB are mixed together to form a solution, and the initiator benzoyl peroxide is added. After it is completely dissolved, the solution is injected into a lithium-ion battery containing positive and negative materials, and placed at 80°C to make it in situ After polymerization, the desired in-situ polymerized solid electrolyte was obtained after 6 hours.
[0054] table 3:
[0055]
[0056] The electrolyte obtained from the above examples has high ionic conductivity, wide electrochemical window and high tensile strength (Table 3). The above electrolytes containing 200 and 1000ppm water were assembled into NCM622 / Li metal batteries, and the capacity retention rates were 92% and 84% after 100 cycles at operating voltages of 2.0-4.4V and 0.5C ( image 3 ), it can be seen that the obtained polymer electrolyte has excellent wat...
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Abstract
Description
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Application Information
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