A kind of silicon-based negative electrode self-healing polymer binder and its preparation method and application
A technology of silicon-based negative electrodes and polymers, applied in electrode manufacturing, structural parts, battery electrodes, etc., can solve the problems of short cycle life of lithium batteries, achieve good electrochemical stability, improve specific capacity and capacity retention, and prolong The effect of cycle life
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[0036] The preparation method of the negative electrode sheet of embodiment and comparative example is as follows:
[0037] Weigh 0.18 g of the mixture of the ball-milled silicon-based active material and conductive agent (mass ratio of 7:2), add it to the TA-PEG-TA / PAA solution, and stir for 8 hours at a speed of 1000 rmp for slurry mixing. The obtained slurry is level. It was coated on copper foil and dried at 40°C. The dried electrode sheet was cut into negative electrode sheets with a diameter of 14 mm, and the relevant electrochemical performance tests were carried out after assembling a button battery in a glove box.
Embodiment 1
[0039] This embodiment prepares a silicon-based negative electrode self-healing polymer binder, and the preparation method is as follows:
[0040] S1. Polyethylene glycol diacrylate is added to lipoic acid, and the ratio of the zinc sulfate to the polyethylene glycol terminated by the diacrylate group is 2 g: 100 μL, and the reaction is stirred at 80° C. for 2 h to obtain polyethylene glycol. alcohol-crosslinked polylipoic acid;
[0041] S2. The polyethylene glycol-crosslinked polylipoic acid obtained in step S1 and polyacrylic acid are mixed and dissolved in 100 mL of ethanol according to a mass ratio of 1:5, the reaction time is 10 min, and the polymer binder is obtained by drying.
Embodiment 2
[0043] The difference between this example and Example 5 is that 0.1 wt% of ferric chloride is also added in step S1.
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