(19) | |
| (11) | EP 2 590 248 A3 |
(12) | EUROPEAN PATENT APPLICATION |
(88) | Date of publication A3: | | 01.01.2014 Bulletin 2014/01 |
(43) | Date of publication A2: | | 08.05.2013 Bulletin 2013/19 |
(22) | Date of filing: 29.10.2012 |
| (51) | International Patent Classification (IPC): |
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(84) | Designated Contracting States: | | AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR | | Designated Extension States: | | BA ME |
(30) | Priority: | 01.11.2011 JP 2011240680
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(71) | Applicant: Shin-Etsu Chemical Co., Ltd. | | Chiyoda-ku
Tokyo (JP) |
| (72) | Inventors: | | - Tetsuo, Nakanishi
Gunma-ken (JP) - Yoshiyasu, Yamada
Gunma-ken (JP) - Kazuyuki, Taniguchi
Gunma-ken (JP)
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(74) | Representative: Wibbelmann, Jobst | | Wuesthoff & Wuesthoff
Patent- und Rechtsanwälte
Schweigerstrasse 2 81541 München 81541 München (DE) |
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(54) | Negative electrode active material for non-aqueous electrolyte secondary battery and method for manufacturing the same |
(57) The present invention provides a method for manufacturing a negative electrode active material for a secondary battery that uses a non-aqueous electrolyte, including the steps of: depositing silicon according to an electron beam vapor-deposition method with metallic silicon as a raw material on a substrate of which temperature is controlled from 800 to 1100°C at a vapor deposition rate exceeding 1 kg/hr in the range of film thickness of 2 to 30 mm; and pulverizing and classifying the deposited silicon to obtain the negative electrode active material. As a result, there is provided a method for manufacturing a negative electrode active material of silicon particles as an active material useful for a negative electrode of a non-aqueous electrolyte secondary battery that is, while maintaining high initial efficiency and battery capacity of silicon, excellent in the cycle characteristics and has a reduced volume change during charge/discharge.