Open AccessOptimising 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
Author(s) -
Zhang Hongliang,
Deng Xiaoli,
Dong Wenquan,
Huang Haifu,
Li Guangxu,
Liang Xianqing,
Zhou Wenzheng,
Guo Jin
Publication year - 2018
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2018.5335
Subject(s) - manganese , electrochemistry , materials science , lithium (medication) , cathode , dielectric spectroscopy , x ray photoelectron spectroscopy , cyclic voltammetry , analytical chemistry (journal) , ternary operation , chemical engineering , electrode , chemistry , metallurgy , medicine , chromatography , computer science , programming language , endocrinology , engineering
Herein, lithium‐rich manganese‐based cathode materials x Li 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 x Li 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.