Title:
POSITIVE ELECTRODE ACTIVE MATERIAL FOR SODIUM SECONDARY BATTERIES AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/225740
Kind Code:
A1
Abstract:
A positive electrode active material for sodium ion secondary batteries, which is composed of a sodium iron oxide that is represented by general formula (1) NaxFeO2 (wherein x is from 0.80 to 1.30), and which has a hexagonal layered rock salt-type crystal structure, while having a lattice constant a of 3.0235 Å or less, a lattice constant c of 16.0820 Å or less and a lattice volume of 127.360 Å3 or less. This positive electrode active material for sodium ion secondary batteries is able to be obtained using abundant resources as the starting materials, and is capable of exhibiting excellent cycle characteristics and high discharge capacity even in cases where the limited charge capacity is set to high values.
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Inventors:
TABUCHI MITSUHARU (JP)
KATAOKA RIKI (JP)
KATAOKA RIKI (JP)
Application Number:
PCT/JP2018/021571
Publication Date:
December 13, 2018
Filing Date:
June 05, 2018
Export Citation:
Assignee:
AIST (JP)
International Classes:
H01M10/054; H01M4/485
Foreign References:
| JP2014086279A | 2014-05-12 | |||
| CN106684369A | 2017-05-17 |
Other References:
KATAOKA, R ET AL.: "Influence of preparation methods on the electrochemical properties and structural changes of alpha-sodium iron oxide as a positive electrode material for rechargeable sodium batteries", ELECTROCHIMICA ACTA, vol. 182, 26 September 2015 (2015-09-26), pages 871 - 877, XP055554649
Attorney, Agent or Firm:
SAEGUSA & PARTNERS (JP)
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