Metal nitride or oxynitride cathode materials for lithium sulfur batteries
AssigneeNavitas Systems, LLC
InventorsPu Zhang, Michael Wixom, Qingliu Wu
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Abstract
Provided are electrode active materials that include a metal oxide or oxynitride with a porous structure that when loaded with sulfur serve as electrochemically superior cathode active materials. The metal nitride or metal oxynitride structures are optionally used on their own, are coated with another material, or itself coats another porous structure such as a porous carbon structure that allows for excellent retention of both sulfur and polysulfides, are conductive themselves, and show long term stability and excellent cycle life.
Claims20
An electrochemically active material comprising:
- an electrically conductive porous structure comprising a metal nitride or metal oxynitride, said structure infiltrated with sulfur such that the sulfur is encapsulated into pores of the metal nitride or metal oxynitride of the porous structure, wherein said metal nitride or metal oxynitride is electrically conductive having an electrical conductivity of greater than 104 S/cm.
An electrochemically active material comprising:
- an electrically conductive porous structure comprising a metal nitride or metal oxynitride, said metal nitride or metal oxynitride is electrically conductive having an electrical conductivity of greater than 104 S/cm, said structure infiltrated with sulfur such that the sulfur is encapsulated into pores of the metal nitride or metal oxynitride of the porous structure, wherein said metal nitride or metal oxynitride further comprises an additive coating at least a portion of the surface of said metal nitride or metal oxynitride.
An electrochemically active material comprising:
- an electrically conductive porous structure comprising a metal nitride or metal oxynitride, said metal nitride or metal oxynitride is electrically conductive having an electrical conductivity of greater than 104 S/cm, said structure infiltrated with sulfur such that the sulfur is encapsulated into pores of the metal nitride or metal oxynitride of the porous structure, wherein said metal nitride or metal oxynitride structure serves as a core, and
- the material further comprising a coating on the core, the coating optionally comprising a metal nitride or oxynitride that differs from the core.
Dependencies are inferred from the claim text.