Title:
ELECTROLYTIC COPPER FOIL AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/121894
Kind Code:
A1
Abstract:
Provided are: an electrolytic copper foil having higher electric conductivity; and a method for producing the electrolytic copper foil. The electrolytic copper foil according to the present invention has a carbon content of 5 ppm or less, a sulfur content of 3 ppm or less, an oxygen content of 5 ppm or less and a nitrogen content of 0.5 ppm or less, and also having a total content of carbon, sulfur, oxygen, nitrogen and hydrogen of 15 ppm or less, wherein the number of crystal grains is 8.0 to 12.0 grains/μm2, and the number of crystal grains changes to 0.6 to 1.0 grain/μm2 after being heated at 150°C for 1 hour. The method for producing the electrolytic copper foil comprises: a washing step of washing a copper raw material; a melting step of melting the washed copper raw material to produce an electrolyte solution having a total organic carbon (TOC) amount of 10 ppm or less; and an electrolysis step of electrolyzing the electrolyte solution to produce the electrolytic copper foil.
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Inventors:
KAWASAKI TOSHIO (JP)
ONUMA TSUYOSHI (JP)
ENDO YASUHIRO (JP)
ONUMA TSUYOSHI (JP)
ENDO YASUHIRO (JP)
Application Number:
PCT/JP2019/047230
Publication Date:
June 18, 2020
Filing Date:
December 03, 2019
Export Citation:
Assignee:
NIPPON DENKAI LTD (JP)
International Classes:
C25D1/04; C25D1/00; H01M4/66
Foreign References:
| JP2018063938A | 2018-04-19 | |||
| JP2000182623A | 2000-06-30 | |||
| JP2018137343A | 2018-08-30 |
Other References:
See also references of EP 3896198A4
Attorney, Agent or Firm:
OKUYAMA, Shoichi et al. (JP)
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