An organic-inorganic composite lithium-ion battery separator
A lithium-ion battery and inorganic composite technology, applied in the direction of secondary batteries, battery components, separators/films/diaphragms/spacers, etc., can solve the problem of poor absorption and retention of liquid electrolytes and electrolyte affinity And problems such as poor wettability and poor thermal stability of the diaphragm, to achieve the effect of saving procedures, reducing energy consumption, and improving the speed of wetting and absorption
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specific Embodiment approach 1
[0054] Specific implementation mode 1: An organic-inorganic composite lithium-ion battery separator in this embodiment is to introduce SiO into the surface of the PEI film obtained by electrospinning. 2 Inorganic coating layer, the single fiber of the organic-inorganic composite lithium-ion battery separator is covered with SiO with a diameter of 80nm to 150nm 2 The inorganic layer composed of particles is completely covered. The porosity of the organic-inorganic composite lithium-ion battery separator is 77.8%-91.6%. The electrolyte can penetrate into the organic-inorganic composite lithium-ion battery separator in 0.1 seconds to 0.6 seconds. The thermal shrinkage rate of the battery separator is less than 0.1% when treated at 200°C for 0.5h-1h, and less than 3% when treated at 220°C for 1h, and the capacity retention rate is 92.4%-98.6% after 100 cycles.
specific Embodiment approach 2
[0055] Specific embodiment two: the preparation method of a kind of organic-inorganic composite lithium-ion battery diaphragm of the present embodiment is to carry out according to the following steps:
[0056] 1. Preparation of spinning solution:
[0057] Add the solute PEI into the solvent, stir for 4 hours to 8 hours at a temperature of 40°C to 80°C to obtain a clear and transparent solution, then stand still and defoam to obtain a spinning solution;
[0058] The volume ratio of described solute PEI and solvent is 1:(3~9); Described solvent is the mixed solvent of N-methylpyrrolidone and tetrahydrofuran; The volume ratio of described tetrahydrofuran and N-methylpyrrolidone is 1: (4~9);
[0059] 2. Preparation of PEI nanofiber membrane:
[0060] Put the spinning solution into the syringe, and then place it on the syringe pump of the spinning machine. When the advancing rate is 0.1mL / h-0.3mL / h, the spinning voltage is 12kV-18kV, and the distance between the aluminum receivi...
specific Embodiment approach 3
[0074] Specific embodiment 3: The difference between this embodiment and specific embodiment 2 is that in step 1, the solute PEI is added to the solvent, and stirred at a temperature of 60°C to 80°C for 6h to 8h to obtain a clear and transparent solution, and then Stand still and defoam to obtain spinning solution. Others are the same as in the second embodiment.
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