ϵ-VOPO4 cathode production, and applications thereof
AssigneeThe Research Foundation for The State University of New York
InventorsKrystal Lee, Carrie Siu, Fengxia Xin, M. Stanley Whittingham
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Abstract
A lithium battery with a cathode fabricated using an improved method for slurry formulation and electrode production. The cathode comprises the epsilon polymorph of vanadyl phosphate, ε-VOPO4, made from solvothermally synthesized H2VOPO4, and optimized to reversibly intercalate two Li-ions to reach full theoretical capacity 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. The ε-VOPO4 particles may be modified with niobium (Nb) to improve the cycling stability.
Claims20
A cathode for A lithium battery, comprising:
- ε-VOPO4 particles having a dual lithium ion exchange characteristic;
- wherein the ε-VOPO4 particles are solvothermally generated and modified to include β-VOPO4;
- and
- wherein the cathode has a capacity of at least 260 mAh/g at a discharge rate of C/20.
A lithium battery, comprising:
- a cathode formed with modified ε-VOPO4 particles comprising β-VOPO4, having a dual lithium ion exchange characteristic,
- wherein the modified ε-VOPO4 particles are solvothermally generated, and wherein the cathode has a capacity of at least 260 mAh/g at a discharge rate of C/20;
- and
- an anode.
A lithium metal battery, comprising:
- a cathode formed with ε-VOPO4 particles having a dual lithium ion exchange characteristic, modified to include β-VOPO4,
- wherein the ε-VOPO4 particles are solvothermally generated, and wherein the cathode has a capacity of at least 260 mAh/g at a discharge rate of C/10;
- and
- a lithium metal anode.
Dependencies are inferred from the claim text.