Battery separator and lithium secondary battery
A lithium secondary battery and separator technology, which is applied in the field of battery separators and lithium secondary batteries, can solve the problems of difficulty in injecting non-aqueous electrolyte, difficulty in uniform impregnation of separator, and time required for liquid injection, and achieve operability Improvement, improved dimensional stability, and shortened injection time
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[0102] The following examples will be given to describe the present invention in detail.
[0103] [Example]
[0104] (1) Manufacturing of separators
[0105] The porous elongated laminated film consisting of three layers of polypropylene (PP) layer / polyethylene (PE) layer / polypropylene (PP) layer is thermally bonded to an embossing roll heated to 130°C to produce a image 3 The shown continuous in the direction of 90 degrees to the longitudinal direction of the porous elongated laminated film, the bottom is a non-porous linear concave portion (refer to figure 1 ). The density of the concave part is 0.2 strips / 1cm interval in the longitudinal direction of the porous elongated laminated film, the average depth is 8μm, the average width is 200μm, the film thickness is 25.7μm, and the air permeability is 530 seconds / 100cc, which is extremely large. The pore diameter is 0.12 μm and the porosity is 41%.
[0106] (2) Evaluation of electrolyte injection speed
[0107] In order to...
Embodiment 2
[0120] (1) On the porous elongated laminated film composed of three layers including polypropylene (PP) layer / polyethylene (PE) layer / polypropylene (PP) layer, a filler made of polyethylene is thermocompressed, and the porous elongated laminated film Layer film has figure 2 The cross-section shown, forming image 3 A plurality of non-hole convex regions of the shape shown, results in a separator of the present invention. In the longitudinal direction of the separator, the density of the protrusions was 0.2 / 1 cm interval, the average height was 15 μm, and the average width was 25 μm.
[0121] (2) Except having used the above-mentioned separator, it carried out similarly to Example 1, and measured the liquid absorption rate (weight change) of the non-aqueous electrolytic solution. Figure 13 The result is shown.
[0122] (3) A lithium secondary battery was produced in the same manner as in Example 1 using the above-mentioned separator, and the battery characteristics after 2...
Embodiment 3
[0124] (1) On the porous elongated laminated film comprising three layers of polypropylene (PP) layer / polyethylene (PE) layer / polypropylene (PP) layer, similar to Example 1, the shape is Figure 5 The diagonal lattice formation section shown is figure 1 The multiple non-porous regions of the recesses shown yield the separator of the present invention.
[0125] (2) Except having used the above-mentioned separator, it carried out similarly to Example 1, and measured the liquid absorption rate (weight change) of the non-aqueous electrolytic solution. Figure 14 The result is shown.
[0126] (3) A lithium secondary battery was produced in the same manner as in Example 1 using the above-mentioned separator, and the battery characteristics after 200 cycles were measured. When the initial discharge capacity was taken as 100%, the discharge capacity maintenance rate was 81.9%. In addition, an overcharge test was performed in the same manner as in Example 1, and the surface temperatu...
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Abstract
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