Optimising electrochemical performance of lithium‐rich manganese‐based ternary cathode material x Li ₂ MnO ₃ ·(1 − x )LiNi _0.5 Co _0.3 Mn _0.2 O ₂ by adjusting composition ratio

Abstract

Herein, lithium-rich manganese-based cathode materials xLi 2 MnO 3 •(1 − x)LiNi 0.5 Co 0.3 Mn 0.2 O 2 with different chemical components (x = 0. 4, 0.5, 0.6 and 0.7) were prepared by a simple co-precipitation method. The effects of different chemical components on the crystal structure and electrochemical properties of the lithium-rich manganese-based cathode materials were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy. The results indicate that the sample xLi 2 MnO 3 •(1 − x)LiNi 0.5 Co 0.3 Mn 0.2 O 2 (x = 0.5) shows an optimum electrochemical performance: the first discharge capacity is high up to 240.71 mAh g −1 at 0.1 C; the discharge capacity can be maintained at 153 mAh g −1 after cycling 50 times when measured at a high rate of 2 C, and the good cycle stability at a high charge-discharge rate, where the discharge capacity was maintained at 123.26 mAh g −1 after 100 cycles at 5 C. Therefore, it can well balance the relationship between the specific capacity and rate capability.

MXene‐Ti3C2 Armored Layer for Aluminum Current Collector Enable Stable High‐Voltage Lithium‐Ion Battery

“…The absence of miscellaneous peaks means that MXene layer does not induce side reactions, and the irreversible capacity loss of NCM333 in the first cycle both reflect in the reduction of anodic peak current density. [ 44 ] Differently, outstanding conductivity of MXene‐layer makes current density larger under the same voltage. The anodic peak position of NCM333/MXene‐Al is relatively stable, which is beneficial to cycling performance.…”