Title:
NEGATIVE ELECTRODE ACTIVE MATERIAL AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2020/090172
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a negative electrode active material manufacturing method exhibiting excellent manufacturing efficiency and to provide a negative electrode active material in which the purity of Na3LiTi5O12 is high. The negative electrode active material manufacturing method includes: a step 1 for occluding sodium to Li4Ti5O12 and obtaining a precursor; and a step 2 for oxidizing the precursor by using an oxidant having an oxidation potential exceeding the lithium separation potential so as to obtain a spinel-type sodium titanium oxide phase having a diffraction peak of the (220) surface of a spinel-type crystal structure. The method exhibits excellent manufacturing efficiency, and makes it possible to obtain a negative electrode active material in which the purity of Ti5O12 is high and which includes, at a phase fraction of more than 75%, a spinel-type sodium titanium oxide phase having a diffraction peak of the (220) surface of the spinel-type crystal structure in an X-ray diffraction profile.
Inventors:
KITTA MITSUNORI (JP)
KOJIMA TOSHIKATSU (JP)
KATAOKA RIKI (JP)
KOJIMA TOSHIKATSU (JP)
KATAOKA RIKI (JP)
Application Number:
PCT/JP2019/029683
Publication Date:
May 07, 2020
Filing Date:
July 29, 2019
Export Citation:
Assignee:
AIST (JP)
International Classes:
H01M4/485; C01G23/00; H01M10/054
Domestic Patent References:
| WO2017119171A1 | 2017-07-13 | |||
| WO2013099279A1 | 2013-07-04 | |||
| WO2019054330A1 | 2019-03-21 |
Foreign References:
| JP2015118845A | 2015-06-25 | |||
| CN103633310A | 2014-03-12 |
Other References:
KITTA, MITSUNORI ET AL.: "Irreversible structural change of a spinel Li4Ti5O12 particle via Na insertion-extraction cycles of", ELECTROCHIMICA ACTA, vol. 148, 2014, pages 175 - 179, XP055583269, DOI: 10.1016/j.electacta.2014.10.050
KITTA, MITSUNORI ET AL.: "Mechanism of the Na- substituted Spinel Phase Generation in a Li4Ti5O12 Electrode via Sodium-ion Battery Cycling", ELECTROCHEMISTRY, vol. 86, no. 4, June 2018 (2018-06-01), pages 194 - 197, XP055706210
KITTA, MITSUNORI ET AL.: "Structural study of the Na-included Li4Ti5012 by HR -TEM", EXTENDED ABSTRACTS, THE 62ND JSAP SPRING MEETING 2015, 2015
YU , XIGIAN ET AL.: "A Size-Dependent Sodium Storage Mechanism in Li4Ti5O12 Investigated by a Novel Characterization Technique Combining in Situ X-ray Diffraction and Chemical Sodiation", NANO LETTERS, vol. 13, no. 10, 20 September 2013 (2013-09-20), pages 4721 - 4727, XP055706218
KITTA, MITSUNORI ET AL.: "Mechanism of the Na- substituted Spinel Phase Generation in a Li4Ti5O12 Electrode via Sodium-ion Battery Cycling", ELECTROCHEMISTRY, vol. 86, no. 4, June 2018 (2018-06-01), pages 194 - 197, XP055706210
KITTA, MITSUNORI ET AL.: "Structural study of the Na-included Li4Ti5012 by HR -TEM", EXTENDED ABSTRACTS, THE 62ND JSAP SPRING MEETING 2015, 2015
YU , XIGIAN ET AL.: "A Size-Dependent Sodium Storage Mechanism in Li4Ti5O12 Investigated by a Novel Characterization Technique Combining in Situ X-ray Diffraction and Chemical Sodiation", NANO LETTERS, vol. 13, no. 10, 20 September 2013 (2013-09-20), pages 4721 - 4727, XP055706218
Attorney, Agent or Firm:
TANAKA, Junya et al. (JP)
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