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Design and Preparation of a Lithium‐rich Layered Oxide Cathode with a Mg‐Concentration‐Gradient Shell for Improved Rate Capability
Author(s) -
Yu Ruizhi,
Wang Gang,
Wang Xianyou,
Wang Di,
Wen Weicheng,
Shu Hongbo,
Yang Xiukang
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500148
Subject(s) - cathode , electrochemistry , lithium (medication) , materials science , oxide , precipitation , lithium oxide , ion , chemical engineering , analytical chemistry (journal) , chemistry , electrode , metallurgy , chromatography , lithium vanadium phosphate battery , medicine , physics , organic chemistry , engineering , meteorology , endocrinology
A spherical core–shell lithium‐rich layered oxide material Li 1.5 Mn 0.75 Ni 0.20 Mg 0.05 O 2+ δ (CSLM) with a Mg‐concentration‐gradient shell is rationally designed and synthesized through a co‐precipitation method. The physicochemical and electrochemical properties of the CSLM cathode material are systematically investigated, and compared with the conventional Li 1.5 Mn 0.75 Ni 0.25 O 2+ δ (CL) cathode material. The electrochemical tests demonstrate that the CSLM cathode material exhibits better cycle stability and rate capability. The Li/CSLM cell delivers an excellent cycling performance with a capacity retention of 96.4 % after 100 cycles at 0.5 C. Moreover, at a high rate of 10 C, the Li/CSLM cell can still exhibit a high discharge capacity of 141.1 mAh g −1 , as compared with 58.9 mAh g −1 for the Li/CL cell. Thus, lithium‐rich layered oxide material Li 1.5 Mn 0.75 Ni 0.20 Mg 0.05 O 2+ δ with a Mg‐concentration‐gradient shell is a promising cathode material for advanced lithium‐ion batteries.