Defect Chemistry and Li-ion Diffusion in LiRuO
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Layered LiRuO is an important candidate cathode material in rechargeable lithium ion batteries because of its novel anionic redox process and high reversible capacity. Atomistic scale simulations are used to calculate the intrinsic defect process, favourable dopants and migration energies of lithium ion diffusions together with migration paths in LiRuO. The Li Frenkel is calculated to be the most favourable intrinsic defect type. The cation anti-site defect, in which Li and Ru ions exchange their positions is 1.89 eV/defect suggesting that this defect would be observed at high temperatures. Long range vacancy assisted lithium diffusion paths were calculated and it is confirmed that the lowest overall activation energy (0.73 eV) migration path is along the ab plane. Trivalent dopants (Al, Co, Sc, In, Y, Gd and La) were considered to create additional Li in LiRuO. Here we show that Al or Co are the ideal dopants and this is in agreement with the experimental studies reported on Co doping in LiRuO.
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