Title:
METHOD FOR MANUFACTURING SECONDARY BATTERY, OR SECONDARY BATTERY
Document Type and Number:
WIPO Patent Application WO/2021/149737
Kind Code:
A1
Abstract:
[Problem] In a method for manufacturing secondary batteries, especially in terms of forming a positive electrode for lithium-ion batteries, it was necessary to select polyvinylidene fluoride (PVDF) or the like as a binder due to the problems of heat resistance or chemical resistance when using a liquid electrolyte such as an organic solvent. Solvents which can dissolve such a resin are limited to normal methylpyrrolidone (NMP) and the like, have a high boiling point, and require a long, high-temperature oven. In particular, it was very difficult to make a thick film positive electrode. For lithium-ion batteries, it is difficult to make a thick film positive electrode, and there is still the problem of improving battery performance. In addition, a long, high-temperature drying oven has been an issue in terms of saving energy, saving resources, and saving space. [Solution] By mixing a slurry with a low boiling point solvent, and applying the resultant mixture to a heated object, a parent solvent evaporates due to the azeotropic effect of the low boiling point solvent, and spraying, especially pulsed spraying can evaporate at least 90% of the parent solvent on the object within 5 seconds even when the temperature of the object is 100°C lower, preferably at least 50°C lower than that of the parent solvent. Therefore, a drying device has a very small total length, thus enables lamination, and can facilitate the formation of a thick film positive electrode.
Inventors:
MATSUNAGA MASAFUMI (JP)
Application Number:
PCT/JP2021/001907
Publication Date:
July 29, 2021
Filing Date:
January 20, 2021
Export Citation:
Assignee:
MTEK SMART CORP (JP)
International Classes:
B05D3/00; B05D3/12; B05D7/00; B05D7/24; H01M4/04; H01M4/139; H01M4/36; H01M4/38; H01M4/48; H01M4/587; H01M4/62; H01M10/0562; H01M10/0565; H01M10/058
Domestic Patent References:
| WO2013118758A1 | 2013-08-15 | |||
| WO2010018771A1 | 2010-02-18 |
Foreign References:
| JP2015044156A | 2015-03-12 | |||
| JP2014229479A | 2014-12-08 | |||
| JP2016139511A | 2016-08-04 | |||
| JP2012243472A | 2012-12-10 | |||
| KR101856483B1 | 2018-05-10 |
Download PDF: