(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

(21)Application number: 12007399.4

(22)Date of filing:  29.10.2012
(51)International Patent Classification (IPC): 
H01M 4/66(2006.01)
H01M 10/0525(2010.01)
H01M 4/62(2006.01)
H01M 4/38(2006.01)
H01M 4/04(2006.01)
H01M 4/134(2010.01)
H01M 4/1395(2010.01)
C01B 33/021(2006.01)
B82Y 30/00(2011.01)
H01M 4/02(2006.01)
(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

(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)

(74)Representative: Wibbelmann, Jobst 
Wuesthoff & Wuesthoff Patent- und Rechtsanwälte Schweigerstrasse 2
81541 München
81541 München (DE)

  


(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.





Search report









Search report