Li_1.4Al_0.4Ti_1.6(PO₄)₃ coated Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ for enhancing electrochemical performance of lithium-ion batteries

Abstract

Lithium (Li)-rich manganese (Mn)-based cathode Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ (LRNCM) has attracted considerable attention owing to its high specific discharge capacity and low cost. However, unsatisfactory cycle performance and poor rate property hinder its large-scale application. The fast ionic conductor has been widely used as the cathode coating material because of its superior stability and excellent lithium-ion conductivity rate. In this study, Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ is modified by using Li_1.4Al_0.4Ti_1.6(PO₄)₃ (LATP) ionic conductor The electrochemical test results show that the discharge capacity of the resulting LRNCM@LATP1 sample is 198 mA·h/g after 100 cycles at 0.2C, with a capacity retention of 81%. Compared with the uncoated pristine LRNCM (188.4 mA·h/g and 76%), LRNCM after the LATP modification shows superior cycle performance. Moreover, the lithium-ion diffusion coefficient D_Li+ is a crucial factor affecting the rate performance, and the D_Li+ of the LRNCM material is improved from 4.94×10⁻¹³ to 5.68×10⁻¹² cm²/s after modification. The specific capacity of LRNCM@LATP1 reaches 102.5 mA·h/g at 5C, with an improved rate performance. Thus, the modification layer can considerably enhance the electrochemical performance of LRNCM.

Keywords

surface modification / Li-rich cathode material / electrochemical performance / Li_1.4Al_0.4Ti_1.6(PO₄)₃ / Li_1.2Ni_0.13Co_0.13Mn_0.54O₂ / Li-ion batteries

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