Composition for producing porous film, separator, electrochemical element, and method for producing electrode complex
A composition and porous membrane technology, applied in the field of electrode composite manufacturing, can solve problems such as difficulty in obtaining high-performance electrochemical elements and generation of lithium dendrites
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Embodiment 1～36
[0205] In the solvent described in Table 1, 10 parts by mass of the above-mentioned hydrophobically modified cellulose fibers and 0.4 parts by mass of polyvinylidene fluoride were mixed so that the solid content concentration was about 1 mass %.
[0206] The obtained mixture was subjected to a dispersion treatment for 10 minutes using a bead mill to obtain a composition for forming a porous film.
[0207] The composition for forming a porous film after the dispersion treatment was visually observed, and the dispersion state of the hydrophobically modified cellulose fibers in the composition for forming a porous film was evaluated according to the following criteria. The evaluation results are described in Table 1.
[0208] ⊚: Cellulose fibers are well dispersed.
[0209] ○: Cellulose fibers were dispersed, but slow sedimentation was observed.
[0210] ×: Separation and sedimentation of cellulose fibers were observed.
[0211] [Table 1]
[0212]
[0213] As can be...
Embodiment 37
[0215] The composition for forming a porous film of Example 22 was coated on the surface of the negative electrode (LTO, lithium titanium oxide) formed on the aluminum sheet using a rotary atomizing coating apparatus, and then the coated film was heated On the other hand, NMP was removed to form a separator with a film thickness of 4 μm.
[0216] In addition, the volume average particle diameter of the hydrophobically modified cellulose fiber in the composition for porous film formation of Example 22 was 40 micrometers.
[0217]On the surface of the formed separator, a droplet of an electrolytic solution containing dimethyl carbonate was dropped. As a result, 2 seconds after dropping, the electrolytic solution penetrated into the separator, and the contact angle of the electrolytic solution could not be measured.
[0218] From this, it is clear that the contact angle between the above-mentioned electrolyte solution and the surface of the separator is 25° or less.
[0219] A p...
Embodiment 38
[0226] Except having changed the polyvinylidene fluoride to styrene butadiene rubber, it carried out similarly to Example 22, and obtained the composition for porous film formation.
[0227] Using the obtained composition for porous film formation, it carried out similarly to Example 37, and produced the battery cell.
[0228] When the obtained battery cell was subjected to charge-discharge evaluation (three cycles) in the same manner as in Example 37, the result was as good as the evaluation result of Example 37.
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