Improvement of Cyclic Stability of Na_0.67Mn_0.8Ni_0.1Co_0.1O_2 via Suppressing Lattice Variation

Strategies to prolong operational life are highly pursued to strengthen the advantage of cost-effectiveness on sodium-ion batteries (SIBs). We demonstrate the crucial influence of particles' internal mechanical strains on durability of cathode, which does not attract enough attentions from the community. Among the investigated samples, 2% Ti-modified-Na_0.67Ni_0.1Co_0.1Mn_0.8O_2 suppresses the c-axis lattice variation by 38%, attains the reversible capacity 86% higher after 200 cycles, and still keeps intact morphology. This approach indicates that the mechanical properties could tailor cyclic stability of cathode, which is particular important to further improve competitiveness for SIBs.