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still a pivotal challenges. Here,we report a series of Ti-doped Na0.67Co0.67Mn0.33-χTiχO2 ( 0≤ χ ≤0.2 ) samples as cathodes for SIBs. As a result, the multiphase transition during the charge-discharge was successfully prohibited by partial Ti doped. It is found that the Na0.67Co0.67Mn0.23Ti0.1O2 cathode exhibited superior rate performance and tremendous capacity retention. Particularly, the Na0.67Co0.67Mn0.23Ti0.1O2 cathode delivers a initial discharge capacity of about 91.2 mAh g -1 at 1C. More attractively, even at high current rates (10, 15, 20 and 30 C), superior rate capability is achieved while retaining tremendous capacity retention. Nearly 81.02% of the initial capacity was retained after 1000 charge/discharge cycles at 20 C (3.42A g -1 ). Therefore, Ti-doped Na0.67Co0.67Mn0.23Ti0.1O2 may be a promising cathode material for SIBs with excellent rate and cycling performance.

international journal of electrochemical science

Titanium-doped P2-type Na0.67Co0.67Mn0.33-&amp;#x003C7;Ti&amp;#x003C7;O2 (0 &amp;#x02264; &amp;#x003C7; &amp;#x02264; 0.2) as Novel Cathodes for Sodium Ion Batteries with Superior-Rate