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Synthesis, structural and electrochemical properties of V₄O₉ cathode for lithium batteries.

ABSTRACT: Single-phase three-dimensional vanadium oxide (V₄O₉) was synthesized by reduction of V₂O₅ using a gas stream of ammonia/argon (NH₃/Ar). The as-synthesized oxide, prepared by this simple gas reduction method was subsequently electrochemically transformed into a disordered rock salt type-"Li3.7V4O9" phase while cycling over the voltage window 3.5 to 1.8 V versus Li. The Li-deficient phase delivers an initial reversible capacity of ∼260 mAhg^-1 at an average voltage of 2.5 V vs. Li⁺/Li⁰. Further cycling to 50 cycles yields a steady 225 mAhg^-1. Ex situ X-ray diffraction studies confirmed that (de) intercalation phenomena follows a solid-solution electrochemical reaction mechanism. As demonstrated, the reversibility and capacity utilization of this V₄O₉ is found to be superior to battery grade, micron-sized V₂O₅ cathodes in lithium cells.

SUBMITTER: Senguttuvan P

PROVIDER: S-EPMC10157056 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature

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Synthesis, structural and electrochemical properties of V4O9 cathode for lithium batteries.

Senguttuvan Premkumar P Lee Eungje E Key Baris B Johnson Christopher S CS

Frontiers in chemistry 20230420

Single-phase three-dimensional vanadium oxide (V4O9) was synthesized by reduction of V2O5 using a gas stream of ammonia/argon (NH3/Ar). The as-synthesized oxide, prepared by this simple gas reduction method was subsequently electrochemically transformed into a disordered rock salt type-"Li3.7V4O9" phase while cycling over the voltage window 3.5 to 1.8 V versus Li. The Li-deficient phase delivers an initial reversible capacity of ∼260 mAhg<su ...[more]

PMID: 37153528

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