Composition for forming porous film, separator, electrochemical device, 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] 10 parts by mass of the above-mentioned hydrophobized modified cellulose fibers and 0.4 parts by mass of polyvinylidene fluoride were mixed in the solvent described in Table 1 so that the solid content concentration was about 1 mass %.
[0206] The obtained mixture was subjected to dispersion treatment for 10 minutes using a bead mill to obtain a composition for forming a porous film.
[0207] The porous film-forming composition after the dispersion treatment was observed visually, and the dispersion state of the hydrophobized modified cellulose fibers in the porous film-forming composition 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] Solvent name decentralized evalua...
Embodiment 37
[0215] Using a coating device of a rotary atomization method, the composition for forming a porous film of Example 22 is coated on the surface of a negative electrode (LTO, lithium titanium oxide) formed on an aluminum sheet, and the coated film is then heated. On the other hand, NMP was removed to form a separator having a film thickness of 4 μm.
[0216] In addition, the volume average particle diameter of the hydrophobized 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 the electrolyte solution containing dimethyl carbonate was dropped. As a result, 2 seconds after the drop, the electrolyte solution permeated into the separator, and the contact angle of the electrolyte solution could not be measured.
[0218] From this, it can be seen that the contact angle between the electrolyte solution and the surface of the separator is clearly 25° or less.
[0219] A p...
Embodiment 38
[0226] Except having changed polyvinylidene fluoride into styrene-butadiene rubber, it carried out similarly to Example 22, and obtained the composition for porous membrane formation.
[0227] Using the obtained composition for forming a porous film, it carried out similarly to Example 37, and produced the battery cell.
[0228] When the obtained battery cell was subjected to charge and discharge evaluation (three cycles) in the same manner as in Example 37, the results were as favorable as in Example 37.
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