A lithium-ion battery separator with high fusing temperature and preparation method thereof
A lithium ion battery and separator technology, which is applied to the high fusing temperature lithium ion battery separator and the field of its preparation, can solve the problems of poor compatibility, many additional equipment, and the structure of the composite membrane is not easy to maintain, and achieves stable performance and good compatibility. The effect of improving the safety of use
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Embodiment 1
[0024] By twin-screw extruder 1 the ETFE (weight average molecular weight 2.5 * 10 of 10wt%) 6 ), the diisobutyl adipate of 90wt% is at 250 ℃, melt extrusion under the condition of 180rpm obtains ETFE film liquid A; By twin-screw extruder 2, the high-density polyethylene (weight-average molecular weight 2.5× 10 6 ), 70wt% diisobutyl adipate was melt-extruded at 200°C and 160rpm to obtain PE film solution B; the two solutions were symmetrically arranged in three layers of A / B / A in a T-shaped co-extrusion die The structure is co-extruded and casted into a film, which is drawn and formed on a cooling roll with a surface temperature of 25°C. The thickness ratio of the three layers is 1:1.5:1 to obtain the primary film. The initial film is biaxially stretched, and the stretching ratio is vertical x horizontal = 3 x 3 times. The film obtained after stretching is washed with methanol and dried. Then the film was heat-set at a setting temperature of 100° C. for 1 min to obtain a thr...
Embodiment 2
[0026] By twin-screw extruder 1 with 60wt% ETFE (weight-average molecular weight 2.0 * 10 5 ), the triethyl citrate of 40wt% is at 240 ℃, melt extrusion under the condition of 200rpm obtains ETFE membrane liquid A; By twin-screw extruder 2, the high-density polyethylene (weight-average molecular weight 9.0 * 10 6 ), 90wt% triethyl citrate was melt-extruded at 200°C and 150rpm to obtain PE film solution B. The two solutions were co-extruded and casted into a film in a T-shaped co-extrusion die with an A / B / A three-layer symmetrical structure, and drawn on a cooling roll with a surface temperature of 25°C. The thickness ratio of the three layers was 1. : 1.5: 1, the initial film was obtained. The initial film is biaxially stretched, and the stretching ratio is vertical x horizontal = 6 x 6 times. The film obtained after stretching is washed with petroleum ether and dried. Then the film was heat-set at a setting temperature of 85° C. for 5 minutes to obtain a three-layer composi...
Embodiment 3
[0028] By twin-screw extruder 1 the ETFE (weight-average molecular weight 3 * 10 of 15wt%) 6 ), 85wt% dibutyl phthalate is at 280 ℃, and melt extrusion under the condition of 200rpm obtains ETFE film liquid A; By twin-screw extruder 2, 50wt% high-density polyethylene (weight-average molecular weight 5.0 * 10 5 ), 50wt% dibutyl phthalate was melt-extruded at 220°C and 180rpm to obtain PE film solution B. The two solutions were co-extruded and casted into a film in a T-shaped co-extrusion die with an A / B / A three-layer symmetrical structure, and drawn on a cooling roll with a surface temperature of 25°C. The thickness ratio of the three layers was 1. : 1.5: 1, the initial film was obtained. The initial film is biaxially stretched, and the stretching ratio is vertical x horizontal = 10 x 10 times. The film obtained after stretching is washed with trichlorethylene and dried. Then the film was heat-set at a setting temperature of 110° C. for 3 minutes to obtain a three-layer compo...
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