Substrate for lithium secondary battery and separator for lithium secondary battery
A lithium secondary battery and base material technology, which is applied in the direction of lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of poor surface smoothness, high separator resistance, and no research has been carried out to achieve smoothness High resistance, excellent compactness, and the effect of inhibiting peeling and falling off
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Embodiment 1～13、 comparative example 1～6
[0156] The unfibrillated lyocell single fiber (fiber diameter: 15 μm, fiber length: 4 mm, manufactured by Cotors Co., Ltd.) was repeatedly treated 50 times using a double disc mill to produce fibrillated lyocell fiber 1.
[0157] According to the number of compounding parts shown in Table 1, the raw materials were mixed together, dissociated in the water of the pulp machine, and a uniform papermaking slurry (1% concentration) was produced under stirring by a stirrer. The slurry for papermaking was taken up using a wet method using a cylinder paper machine, dried with a cylinder dryer at 130°C, and unstretched polyethylene terephthalate (PET) was thermally melted. The adhesive short fibers were bonded to develop the strength of the nonwoven fabric, and a nonwoven fabric with a width of 50 cm was produced. Next, a super calendering treatment is performed to form a base material for a lithium secondary battery.
[0158] [Table 1]
[0159] Table 1
[0160]
[0161]
[0162...
Embodiment 14～36、 comparative example 7～10
[0195] [Physical property values of fibrillated lyocell fibers]
[0196] For fibrillated lyocell fibers,
[0197] (1) Use 80-mesh metal mesh with a wire diameter of 0.14mm and a mesh size of 0.18mm as the sieve plate, and the sample concentration is 0.1%. In addition, the freeness of the modified method measured according to JIS P8121: "Freedom of the modified method"
[0198] (2) Length-weighted average fiber length: "Average Fiber Length"
[0199] Shown in Table 3. Furthermore, the fibrillated lyocell fibers in each state were produced by treating non-fibrillated lyocell single fibers (fiber diameter 12 μm, fiber length 6 mm, manufactured by Cotors Co., Ltd.) using a double disc mill.
Embodiment 14～17、28、 comparative example 7～9、 Embodiment 32～36
[0201] According to the compounding number shown in Table 3, the raw materials were mixed together, dissociated in the water of the pulp machine, and a uniform papermaking slurry (1% concentration) was produced under stirring by a stirrer. This slurry for papermaking was taken up using a wet method using a cylinder paper machine, dried with a cylinder dryer at 130° C., and a nonwoven fabric with a width of 50 cm was produced. Next, both surfaces were brought into contact with a metal roll heated to 210° C., heat-treated, and supercalendered to form a lithium secondary battery base material.
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