| Abstrakt: |
In this paper, iron and tungsten co-doped lithium nickelate cathode materials (LiNi0.97 Fe0.02 W0.01) were synthesized by the sol-gel method, and the effect of double cation doping on the electrochemical perform-ance of lithium nickelate cathode materials was studied. The results show that the co-doping of iron and tungsten can significantly reduce the Li/Ni cation mixing, inhibiting the phase transition from H2 to H3, improving cycle stability and reducing the voltage platform decay. At a current density of 200 mA/g, the capacity retention of the LiNi0.97Fe0.02 W0.01O2 material after 100 cycles is 88.1%, while that of the LiNiO, material is only 62.9%. In addition, the LiNi0.97Fe0.02 W0.01O2 material also has more excellent rate performance (the discharge specific capacity is 126.3 mAh/g at a current density of 4000 mA/g). Therefore, the double cation doping is beneficial to improve the electrochemical performance of the cobalt-free high nickel layered oxide cathode material. [ABSTRACT FROM AUTHOR] |
