Title:
NEGATIVE ELECTRODE ACTIVE MATERIAL AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/239676
Kind Code:
A1
Abstract:
With regard to a negative electrode active material that contains negative electrode active material particles, the present invention is a negative electrode active material in which the negative electrode active material particles contain lithium and oxygen, have a ratio between oxygen and silicon of SiOX : 0.8 ≤ X ≤ 1.2, contain silicon compound particles that contain Li2SiO3, have an Si crystallite size of not more than 10 nm, are coated by a carbon coating film, and satisfy the relationship 2 ≤ P2/P1 ≤ 3.5 where, in x-ray diffraction using CuKα radiation, P1 is the peak height attributed to at least a portion of the lithium carbonate and appearing in the diffraction angle 2θ range of 20-21° and P2 is the peak height attributed to at least a portion of the Li2SiO3 and appearing in the diffraction angle 2θ range of 17-20°. There is thus provided a negative electrode active material that provides a high aqueous slurry stability and a high capacity and that exhibits good cycle characteristics and initial efficiency.
Inventors:
OSAWA YUSUKE (JP)
MATSUNO TAKUMI (JP)
HIROSE TAKAKAZU (JP)
TAKAHASHI KOHTA (JP)
FURUYA MASAHIRO (JP)
MATSUNO TAKUMI (JP)
HIROSE TAKAKAZU (JP)
TAKAHASHI KOHTA (JP)
FURUYA MASAHIRO (JP)
Application Number:
PCT/JP2022/019356
Publication Date:
November 17, 2022
Filing Date:
April 28, 2022
Export Citation:
Assignee:
SHINETSU CHEMICAL CO (JP)
International Classes:
H01M4/58; C01B33/32; H01M4/36; H01M4/38
Domestic Patent References:
| WO2017183286A1 | 2017-10-26 |
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Other References:
"Journal of BATTERY ASSOCIATION OF JAPAN", DENCHI, 1 May 2010 (2010-05-01), pages 10
A. HOHLT. WIEDERP. A. VAN AKENT. E. WEIRICHG. DENNINGERM. VIDALS. OSWALDC. DENEKEJ. MAYERH. FUESS, J. NON-CRYST. SOLIDS, vol. 320, 2003, pages 255
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HYE JIN KIMSUNGHUN CHOISEUNG JONG LEEMYUNG WON SEOJAE GOO LEEERHAN DENIZYONG JU LEEEUN KYUNG KIMJANG WOOK CHOI, NANO LETT, vol. 16, 2016, pages 282 - 288
A. HOHLT. WIEDERP. A. VAN AKENT. E. WEIRICHG. DENNINGERM. VIDALS. OSWALDC. DENEKEJ. MAYERH. FUESS, J. NON-CRYST. SOLIDS, vol. 320, 2003, pages 255
V. KAPAKLIS, J. NON-CRYSTALLINE SOLIDS, vol. 354, no. 2008, February 1961 (1961-02-01)
MARIKO MIYACHIHIRONORI YAMAMOTOHIDEMASA KAWAI, J. ELECTROCHEM. SOC, vol. 154, 2007, pages A1112 - A1117
M. YAMADAM. INABAA. UEDAK. MATSUMOTOT. IWASAKIT. OHZUKU ET AL., J. ELECTROCHEM. SOC, vol. 159, 2012, pages A1630
HYE JIN KIMSUNGHUN CHOISEUNG JONG LEEMYUNG WON SEOJAE GOO LEEERHAN DENIZYONG JU LEEEUN KYUNG KIMJANG WOOK CHOI, NANO LETT, vol. 16, 2016, pages 282 - 288
Attorney, Agent or Firm:
YOSHIMIYA Mikio et al. (JP)
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