Cathode materials for secondary (rechargeable) lithium batteries
AssigneeBoard of Regents, The University of Texas System
InventorsMichel Armand, John B. Goodenough, Akshaya K. Padhi, Kirakodu S. Nanjundaswamy, Christian Masquelier
Life of this patent
Estimating the term…
Abstract
The invention relates to materials for use as electrodes in an alkali-ion secondary (rechargeable) battery, particularly a lithium-ion battery. The invention provides transition-metal compounds having the ordered-olivine, a modified olivine, or the rhombohedral NASICON structure and the polyanion (PO4)3− as at least one constituent for use as electrode material for alkali-ion rechargeable batteries.
Claims25
A cathode material for a rechargeable electrochemical cell, said cell also comprising an anode and an electrolyte, the cathode material comprising a compound of the ordered or modified olivine structure having the formula:
- LixM1−(d+t+q+r)DdTtQqRr(XO4)
- wherein:
- N is a cation of a metal selected from the group consisting of Fe, Mn, Co, Ti, Ni or mixtures thereof;
- D is a metal having a +2 oxidation state selected from the group consisting of Mg2+, Ni2+, Co2+, Zn2+, Cu2+, and Ti2+;
- T is a metal having a +3 oxidation state selected from the group consisting of Al3+t, Ti3+, Cr3+, Fe3+, Mn3+, Ga3+, Zn3+, and V3+;
- Q is a metal having a +4 oxidation state selected from the group consisting of Ti4+;
- Ge4+;
- Sn4+, and V4+;
- R is a metal having a +5 oxidation state selected from the group consisting of V5+;
- Nb5+, and Ta5+;
- X comprises Si, S, P, V or mixtures thereof;
- 0≦x≦1;
- and
- 0≦d, t, q, r≦1, where at least one of d, t, q, and r is not 0.
Dependencies are inferred from the claim text.