Table 2.
A summary of current air-stable NaxTMO2 cathode.
| Air stable materials | Design strategies | Test conditions | Rate performance | Cycling performance | References | ||||
|---|---|---|---|---|---|---|---|---|---|
| Maximum rate (C) | Capacity (mAh g−1) | Capacity retention | Cycle rate (C) | Cycle number | Capacity retention | ||||
| Na2/3Ni1/3Mn2/3O2 | Ni/Mn ordering arrangement | Air-exposure and water soaking | None | None | None | None | None | None | Lu and Dahn, 2001b |
| NaMnNi0.1Ti0.1O2 | titanium (III) oxides protective layer | Air-exposure | 10 | 102 | 55% | 5 | 500 | 81% | Guo et al., 2017 |
| ZrO2@NaNi0.7Mn0.15Co0.15O2 | ZrO2 protective layer | Air-exposure | 10 | 41 | 37% | 0.5 | 200 | 70% | You et al., 2018 |
| NaNi0.45Cu0.05Mn0.4Ti0.1O2 | Cu/Ti co-substitution | Air-exposure and water soaking | 4 | 100 | 80% | 1 | 500 | 70.2% | Yao et al., 2017 |
| Na2/3CuxNi1/3−xMn2/3O2 | Cu substitution | Air-exposure | 5 | 80 | 87% | None | None | None | Zheng L. et al., 2017 |
| Na7/9Cu2/9Fe1/9Mn2/3O2 | Cu substitution | Air-exposure and water soaking | 2 | 50 | 52% | 1 | 150 | 87% | Li Y. et al., 2015 |
| Na0.9Cu0.22Fe0.30Mn0.48O2 | Cu substitution | Air-exposure | 5 | 60 | 60% | 0.1 | 100 | 97% | Mu et al., 2015 |
| NaLi0.05Mn0.5Ni0.3Cu0.1Mg0.05O2 | Cu substitution | Water soaking | 1 | 125 | 71% | 1 | 400 | 67.4% | Deng et al., 2018 |
| Na0.6Mn0.9Cu0.1O2 | Cu substitution | Air-exposure and water soaking | 8 | 85 | 50.4% | 4 | 250 | 70.4% | Chen et al., 2018 |