Significant Enhancement of the Capacity and Cycling Stability of Lithium-Rich Manganese-Based Layered Cathode Materials Via Molybdenum Surface Modification

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2022 Apr 12

PMID 35408499

Authors

Yijia Shao

Zhiyuan Lu

Luoqian Li

Yanni Liu

Lijun Yang

Ting Shu

Xiuhua Li

Shijun Liao

Affiliations

Soon will be listed here.

Abstract

Lithium-rich manganese-based layered cathode materials are considered to be one of the best options for next-generation lithium-ion batteries, owing to their ultra-high specific capacity (>250 mAh·g−1) and platform voltage. However, their poor cycling stability, caused by the release of lattice oxygen as well as the electrode/electrolyte side reactions accompanying complex phase transformation, makes it difficult to use this material in practical applications. In this work, we suggest a molybdenum surface modification strategy to improve the electrochemical performance of Li1.2Mn0.54Ni0.13Co0.13O2. The Mo-modified Li1.2Mn0.54Ni0.13Co0.13O2 material exhibits an enhanced discharge specific capacity of up to 290.5 mAh·g−1 (20 mA·g−1) and a capacity retention rate of 82% (300 cycles at 200 mA·g−1), compared with 261.2 mAh·g−1 and a 70% retention rate for the material without Mo modification. The significantly enhanced performance of the modified material can be ascribed to the formation of a Mo-compound-involved nanolayer on the surface of the materials, which effectively lessens the electrolyte corrosion of the cathode, as well as the activation of Mo6+ towards Ni2+/Ni4+ redox couples and the pre-activation of a Mo compound. This study offers a facile and effective strategy to address the poor cyclability of lithium-rich manganese-based layered cathode materials.

Citing Articles

Structural and Electrochemical Properties of LiO-VO-BO-BiO Glass and Glass-Ceramic Cathodes for Lithium-Ion Batteries.

Chen Y, Zhao Y, Liu F, Ding M, Wang J, Jiang J Molecules. 2023; 28(1).

PMID: 36615423 PMC: 9822462. DOI: 10.3390/molecules28010229.

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