Positive electrode active material for sodium-ion batteries
AssigneeFundacióN Centro De InvestigacióN Cooperativa De EnergíAS Alternativas Cic Energigune Fundazioa
InventorsMan Huon HAN, Elena GONZALO, Teófilo ROJO
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Abstract
A positive electrode active material for a sodium-ion secondary battery contains a compound of formula NaxMn1−y−zMyM′zO2 or its hydrate. A cathode can contain the active material and rechargeable sodium-ion battery can contain such a cathode.
Claims15
A positive electrode active material for a sodium-ion secondary battery, said positive electrode active material comprising a compound of formula (I):
- NaxMn1−y−zMyM′zO2 (I)
- or a hydrated form thereof,
- wherein:
- M is one or more elements selected from Ti, V, Cr, Zr, and Al;
- wherein Ti is selected from Ti3+ and Ti4+;
- V is selected from V2+, V3+, V4+, V5+;
- Cr is selected from Cr2+, Cr3+ and Cr6+;
- Zr is Zr4+;
- and Al is Al3+;
- M′ is one or more elements selected from Fe, Ni and Zn;
- wherein Fe is selected from Fe2+ and Fe3+;
- Ni is Ni3+;
- and Zn is Zn4+;
- the oxidation state of Mn ranges from 3+ to 4+;
- 0.6<x≤1.0;
- 0<y≤0.4;
- 0.05≤z<0.2;
- provided that:
- 0.05<(y+z)≤0.4.
A cathode for a rechargeable sodium-ion secondary battery, said cathode comprising a positive electrode active material, wherein the positive electrode active material comprises a compound of formula (I):
- NaxMn1−y−zMyM′zO2 (I)
- or a hydrated form thereof,
- wherein:
- M is one or more elements selected from Ti, V, Cr, Zr, and Al;
- wherein Ti is selected from Ti3+ and Ti4+;
- V is selected from V2+, V3+, V4+, V5+;
- Cr is selected from Cr2+, Cr3+ and Cr6+;
- Zr is Zr4+;
- and Al is Al3+;
- M′ is one or more elements selected from Fe, Ni and Zn;
- wherein Fe is selected from Fe2+ and Fe3+;
- Ni is Ni3+;
- and Zn is Zn4+;
- the oxidation state of Mn ranges from 3+ to 4+;
- 0.6<x≤1.0;
- 0<y≤0.4;
- 0.05≤z<0.2;
- provided that:
- 0.05<(y+z)≤0.4.
A method of storing energy, the method comprising:
- providing an energy storage device, wherein:
- the energy storage device comprising a rechargeable sodium-ion secondary battery comprising a cathode, said cathode comprising a current collector made of an aluminum or copper foil covered by a film, said film comprising the positive electrode active material, a conductive additive and a binder, wherein the positive electrode active material comprises a compound of formula (I):
- NaxMn1−y−zMyM′zO2 (I)
- or a hydrated form thereof,
- wherein:
- M is one or more elements selected from Ti, V, Cr, Zr, and Al;
- wherein Ti is selected from Ti3+ and Ti4+;
- V is selected from V2+, V3+, V4+, V5+;
- Cr is selected from Cr2+, Cr3+ and Cr6+;
- Zr is Zr4+;
- and Al is Al3+;
- M′ is one or more elements selected from Fe, Ni and Zn;
- wherein Fe is selected from Fe2+ and Fe3+;
- Ni is Ni3+;
- and Zn is Zn4+;
- the oxidation state of Mn ranges from 3+ to 4+;
- 0.6<x≤1.0;
- 0<y≤0.4;
- 0.05≤z<0.2;
- provided that:
- 0.05<(y+z)≤0.4;
- and
- storing energy in the energy storage device.
Dependencies are inferred from the claim text.