Abstract
Here, niobium (Nb) -doped new spherical low-cobalt Li-rich Mn-based Li1.14Mn0.476Ni0.254Co0.048Al0.016O2 cathode materials are reported. It is found that Nb-doping could form strong NbO bonds to stabilize the lattice structure, alleviate structural disorder and maintain the discharge capacity of the cathode during cycling. Moreover, Nb-doping could reduce surface LiOH/Li2CO3 by-product formation during the synthesis process, thereby reducing detrimental side reactions between the electrode and electrolyte resulting in longer cycle life. In addition, the Nb doping also could extend the interlayer spacing, which is conducive to the lithium ion diffusion. The sample (Li1.14Mn0.466Ni0.249Co0.046Al0.015Nb0.02O2, Nb-0.02) doped with Nb at a molar ratio of 2 % in the total transition metals exhibits the best electrochemical performance. It shows the initial coulombic efficiency of 79.6 % and a high discharge specific capacity of 192 mAh g-1 with 92.8 % capacity retention after 200 cycles under C/5 charge and C/3 discharge at the cut-off voltage of 2.0–4.8 V.
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