Title:
POLYCRYSTALLINE MATERIAL AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2016/024530
Kind Code:
A1
Abstract:
The present invention provides a sodium ion secondary battery and a lithium ion secondary battery capable of reversible high-capacity electrical discharge. The sodium ion secondary battery and lithium ion secondary battery comprise a positive electrode, a negative electrode and an electrolyte. The active substances in the positive electrodes and negative electrodes of these secondary batteries are single-phase polycrystalline materials represented by the chemical formula NaxTi4O9 (2 ≤ x ≤ 3), preferably Na2Ti4O9, having a one-dimensional tunnel-type structure and belonging to the monoclinic crystal system. These polycrystalline materials are produced by filling a container comprising a material such as molybdenum with raw materials including a sodium compound, and a titanium compound and/or metallic titanium, and firing at a temperature of from 800°C to 1600°C inclusive.
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Inventors:
KATAOKA KUNIMITSU (JP)
AKIMOTO JUNJI (JP)
AKIMOTO JUNJI (JP)
Application Number:
PCT/JP2015/072404
Publication Date:
February 18, 2016
Filing Date:
August 06, 2015
Export Citation:
Assignee:
NAT INST OF ADVANCED IND SCIEN (JP)
International Classes:
H01M4/485; C01G23/00; H01M10/052; H01M10/054
Domestic Patent References:
| WO2013069597A1 | 2013-05-16 |
Foreign References:
| JPH08198601A | 1996-08-06 | |||
| JP2012051740A | 2012-03-15 |
Other References:
J. AKIMOTO ET AL.: "A large tunnel structure of triclinic Na2Ti4O9", JOURNAL OF SOLID STATE CHEMISTRY, vol. 83, no. 1, November 1989 (1989-11-01), pages 132 - 139, XP024192193, DOI: doi:10.1016/0022-4596(89)90062-5
R. E. MARSH: "On the structure of Na2Ti4O9", JOURNAL OF SOLID STATE CHEMISTRY, vol. 86, no. 1, May 1990 (1990-05-01), pages 135
M. DION ET AL.: "The tetratitanates M2Ti4O9 (M = Li, Na, K, Rb, Cs, T1, Ag", JOURNAL OF INORGANIC AND NUCLEAR CHEMISTRY, vol. 40, no. 5, 1978, pages 917 - 918, XP000644581, DOI: doi:10.1016/0022-1902(78)80175-4
R. E. MARSH: "On the structure of Na2Ti4O9", JOURNAL OF SOLID STATE CHEMISTRY, vol. 86, no. 1, May 1990 (1990-05-01), pages 135
M. DION ET AL.: "The tetratitanates M2Ti4O9 (M = Li, Na, K, Rb, Cs, T1, Ag", JOURNAL OF INORGANIC AND NUCLEAR CHEMISTRY, vol. 40, no. 5, 1978, pages 917 - 918, XP000644581, DOI: doi:10.1016/0022-1902(78)80175-4
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