POROUS FILM AND METHOD FOR PRODUCING POROUS FILM

WIPO Patent Application WO/2021/221020

A1

The present invention improves the characteristics of a porous film.　A porous film according to the present invention comprises a porous base material S and a coating film CF that is provided on the surface of the base material S; and the coating film CF has a thermal deformation of 5% or less, while containing a filler and an oxidized cellulose that has a structure wherein a primary hydroxyl group is oxidized by a carboxyl group. By providing the surface of the base material S with the coating film CF as described above, the mechanical strength and heat resistance of a porous film (separator) are able to be improved. Namely, by adding an oxidized cellulose as described above, alumina and the cellulose are complexed, and the heat resistance is thus able to be improved. In addition, a space between alumina and the base material S is able to be ensured by adding an oxidized cellulose, and the heat resistance is thus able to be improved, while maintaining the characteristics of a battery and without suppressing movement of Li ions in the battery.

JP2003048399	SURFACE TREATING METHOD FOR ALUMINUM OR ALLOY THEREOF
WO/2000/038845	METHOD FOR PRODUCING AN ULTRAPHOBIC SURFACE BY SAND BLASTING

ISHIGURO RYO (JP)
NAKAMURA SATORU (JP)
KUKEN YUSUKE (JP)
ITO YOSHIKI (JP)
GOI YOSUKE (JP)
SAITO YASUTERU (JP)

PCT/JP2021/016666

November 04, 2021

April 26, 2021

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JAPAN STEEL WORKS LTD (JP)
DKS CO LTD (JP)

B05D3/12; B05D7/00; B05D7/24; B32B5/24

JP2018063924A	2018-04-19
JP2014175232A	2014-09-22
JP2018106865A	2018-07-05
JP2013251236A	2013-12-12
JP2016183209A	2016-10-20
JP2017141394A	2017-08-17
JP2020145008A	2020-09-10

TSUTSUI & ASSOCIATES (JP)

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