Separation membrane for battery and battery
A battery and diaphragm technology, applied in the battery field, to achieve the effect of ensuring safety, high output, and preventing short circuit
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Embodiment 1
[0041] First, a scaly inorganic porous material was produced by the following method.
[0042] First, mix high-density polyethylene, silica powder, and paraffinic mineral oil in a ratio of 1:1:2 (weight ratio), heat at 200°C, and shape it into a sheet, and dissolve it in a solvent (normal propyl bromide). bromide) to dissolve the mineral oil to obtain a porous precursor with a sheet thickness of 5 μm. Next, this porous precursor was soaked in a sodium silicate No. 3 No. 100 dilution, dried, and then sintered at 900° C. to obtain a silica porous sheet. By pulverizing this porous silica sheet, a scaly inorganic porous material was obtained. Observation of the obtained scaly inorganic porous material with an electron microscope (KEYENCE (Keyence) VE9800) showed a thickness of about 1 μm, an average particle diameter of 20 μm, an aspect ratio of 20, and an average pore diameter of 0.1 to 0.5 μm. left and right through holes. In addition, the specific gravity is about 0.5, and t...
Embodiment 2
[0047] In the same manner as in Example 1, a lithium cobaltate positive electrode (single-sided coating, capacity 1.5mAh / cm 2 ) as the positive electrode, prepared a graphite negative electrode manufactured by PIOTREK Co., Ltd. (one-sided coating, capacity 1.6mAh / cm 2 ) as the negative electrode, and cut out a size of 2cm×2cm.
[0048] Fully mix 1.5 g of the flaky inorganic porous material (the volume ratio of the flaky inorganic porous material in the solid content is about 60 vol%) in 200 g of the 1 mass % solution of PVDF·HFP prepared in Example 1, and use an applicator , coating a 200 μm film on the positive electrode. This was dried at 150° C. to form a positive electrode epithelial film with a thickness of about 5 μm. Furthermore, in the same manner as in Example 1, this was sealed together with an electrolyte into a laminated film to fabricate a battery.
Embodiment 3
[0050] A polyethylene separator #2400 manufactured by Celgard Co., Ltd. with a thickness of 20 μm was prepared as a separator, and cut out to a size of 2.5 cm×2.5 cm. The spacer has a porosity of about 40%.
[0051] Fully mix 9.5 g of the flaky inorganic porous material (the volume ratio of the flaky porous material of the solid component is about 60vol%) in 100 g of the 1 mass % solution of PVDF·HFP made in Example 1, and mix the previously prepared The polyethylene separator is dipped in the slurry to coat the slurry. Thereafter, it was dried at 100° C. to obtain a separator having a thickness of 25 μm.
[0052] This separator was appropriately combined with the positive electrode and negative electrode prepared in Example 1, and sealed together with the electrolyte in a laminated film to fabricate a battery.
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Abstract
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