Boron-doped sodium layered oxide for reversible oxygen redox reaction in Na-ion battery cathodes.

ABSTRACT: Na-ion cathode materials operating at high voltage with a stable cycling behavior are needed to develop future high-energy Na-ion cells. However, the irreversible oxygen redox reaction at the high-voltage region in sodium layered cathode materials generates structural instability and poor capacity retention upon cycling. Here, we report a doping strategy by incorporating light-weight boron into the cathode active material lattice to decrease the irreversible oxygen oxidation at high voltages (i.e., >4.0 V vs. Na⁺/Na). The presence of covalent B-O bonds and the negative charges of the oxygen atoms ensures a robust ligand framework for the NaLi_1/9Ni_2/9Fe_2/9Mn_4/9O₂ cathode material while mitigating the excessive oxidation of ox

SUBMITTER: Guo YJ 

PROVIDER: S-EPMC8421359 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature