Positive electrode active material for sodium-ion batteries, method for manufacturing same, and sodium-ion battery
AssigneesToyota Jidosha Kabushiki Kaisha, National University Corporation Hokkaido University
InventorsHiroko KUWATA, Hiroaki KOBAYASHI
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Abstract
Disclosed is a positive electrode active material for sodium-ion batteries that has high capacity. The positive electrode active material for sodium-ion batteries of the present disclosure comprises a Na-containing composite oxide having a chemical composition represented by NaxFeyM1-yOz (wherein 3.0<x<9.0, 0<y≤1.0, 3.0<z<6.0, and M: one or more selected from Mn, P, Cr, Sc, Ti, V, Cr, Co, Ni, Cu, Zn, and Ga) and having a crystal structure belonging to space group Pn21a.
Claims5
A positive electrode active material for sodium-ion batteries, comprising a Na-containing composite oxide, wherein
- the Na-containing composite oxide has a chemical composition represented by
- Na
- x
-
- Fe
- y
-
- M
- 1
- -
- y
-
- O
- z
- 3.
- <
- x
- <
- 9.
- ;
- 0
- <
- y
- ≤
- 1.
- ;
- 3.
- <
- z
- <
- 6.
- ;
- and
- M:
- one or more selected from Mn, P, Cr, Sc, Ti, V, Cr, Co, Ni, Cu, Zn, and Ga, and the Na-containing composite oxide has a crystal structure belonging to space group Pn21a.
A method of manufacturing a positive electrode active material for sodium-ion batteries, the method comprising
- obtaining a mixture comprising a Na-containing oxide and a Fe-containing oxide, and
- applying an energy to the mixture to obtain a Na-containing composite oxide, wherein
- a ratio of the Na-containing oxide to the Fe-containing oxide in the mixture is adjusted so that the Na-containing composite oxide has a chemical composition represented by
- Na
- x
-
- Fe
- y
-
- M
- 1
- -
- y
-
- O
- z
- 3.
- <
- x
- <
- 9.
- ;
- 0
- <
- y
- ≤
- 1.
- ;
- 3.
- <
- z
- <
- 6.
- ;
- and
- M:
- one or more selected from Mn, P, Cr, Sc, Ti, V, Cr, Co, Ni, Cu, Zn, and Ga, and
- the energy applied to the mixture is adjusted so that the Na-containing composite oxide has a crystal structure belonging to space group Pn21a.
Dependencies are inferred from the claim text.