Abstract
The short cycle life of Ni-based cathode materials, especially at the high cut-off voltage, is recognized as one of the major hurdles to widespread commercialization. The commonly dopant elements, like Al, Mg, Ti, Zr, Cd, Zn etc., have been in-depth studied to improve electrochemical performances for Ni-rich cathode. However, the Sb as dopant element for Ni-rich cathode materials has rarely been reported. In this work, the Ni-rich cathode material LiNi0.8Co0.1Mn0.1O2 (NCM811) with Sb doping to bulk and Sb2O3 coating to surface is successfully prepared by adjusting the amount of introduced Sb2O3 in high temperature solid-state reaction process. As a result, Sb-modified NCM811 with Sb doping and Sb2O3 coating exhibits capacity of 176 mAh·g−1 with retention reaching 89.3% at 1 C over 3.0–4.4 V at 55 °C after 100 cycles, whereas the bare NCM811 only delivers 151 mAh·g−1 with the retention of 77.0%. The improvement of cyclability is attributed to synergetic effects of Sb modification. This study reflects Sb modification is an effective method for enhancing cycle life of Ni-rich layered cathode materials.
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