ε-VOPO4 cathode for lithium ion batteries
AssigneeThe Research Foundation for The State University of New York
InventorsCarrie Siu, M. Stanley Whittingham
Life of this patent
Estimating the term…
Abstract
The epsilon polymorph of vanadyl phosphate, ε-VOPO4, made from the solvothermally synthesized H2VOPO4, is a high density cathode material for lithium-ion batteries optimized to reversibly intercalate two Li-ions to reach the full theoretical capacity at least 50 cycles with a coulombic efficiency of 98%. This material adopts a stable 3D tunnel structure and can extract two Li-ions per vanadium ion, giving a theoretical capacity of 305 mAh/g, with an upper charge/discharge plateau at around 4.0 V, and one lower at around 2.5 V.
Claims20
A lithium battery, comprising:
- a cathode formed with ε-VOPO4, particles and electrically conductive carbon particles, on a current collector, wherein the ε-VOPO4 has a dual lithium ion exchange characteristic, having a capacity of at least 275 mAh/g at a discharge rate of C/20;
- a lithium metal anode;
- and
- an electrolyte adapted to operate at a charging voltage of at least 4.5 V.
A lithium battery, comprising:
- a cathode comprising a mixture of ε-VOPO4, electrically conductive carbon, and a binder, on a current collector, the ε-VOPO4 having a capacity of at least 275 mAh/g and a capacity of at least 125 mAh/g while maintaining a voltage exceeding 3.7 V, at a discharge rate of C/20;
- an anode comprising lithium metal;
- electrolyte;
- and
- a solid electrolyte interphase.
A battery, comprising:
- a cathode comprising ε-VOPO4, having a capacity of at least 90% of a theoretical capacity value of 305 mAh/g at a discharge rate of C/20, bound with conductive particles;
- an anode;
- and
- an electrolyte.
Dependencies are inferred from the claim text.