Aliovalent-doped sodium chromium oxide (Na_0.9Cr_0.9Sn_0.1O₂ and Na_0.8Cr_0.9Sb_0.1O₂) for sodium-ion battery cathodes with high-voltage characteristics.

ABSTRACT: NaCrO₂ with high rate-capability is an attractive cathode material for sodium-ion batteries (NIBs). However, the amount of reversibly extractable Na⁺ ions is restricted by half, which results in relatively low energy density for practical NIB cathodes. Herein, we describe aliovalent-doped O3-Na_0.9[Cr_0.9Sn_0.1]O₂ (NCSnO) and O3-Na_0.8[Cr_0.9Sb_0.1]O₂ (NCSbO), both of which show high-voltage characteristics that translate to an increase in energy density. In contrast to NaCrO₂, NCSnO and NCSbO can be reversibly charged to 3.80 and 3.95 V, respectively, delivering 0.5 Na⁺ along with Cr^3+/4+ redox alone. The reversible chargeability to Na_0.4[Cr

SUBMITTER: Park WB 

PROVIDER: S-EPMC9058423 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature