Water-stable O3-type layered Na transition metal oxides enabling environment friendly ‘aqueous processing’ of electrodes with long-term electrochemical stability

Tuning the T _M -ion ‘slab thickness’ and alkali metal-ion ‘inter-slab spacing’ of Na-T _M -oxides in opposite terms (and also suppressing T _M -dissolution in electrolyte) leads to outstanding air/water-stability and long-term electrochemical stability.