Title

Multi-Shelled LiMn₁.₉₅Co₀.₀₅O₄ Cages with a Tunable Mn Oxidation State for Ultra-High Lithium Storage

Abstract

Superior electrochemical performance of LiMn2O4 is considered to be one of the most important properties for lithium-ion batteries (LIBs). This paper presents an extremely high performance cathode material, multi-shelled LiMn1.95Co0.05O4 cages, which are created using a sucrose template. A small amount of Co substitution uniformly in a bulk material not only tunes Mn3+ in the minority with bulk stability improving, but can also accommodate specific capacity. In addition, the unique caged structure enhances Li+ diffusion and electrolyte penetration, leading to an outstanding rate capability. The as-synthesized cathode material exhibits a very high capacity of 154.4 mA h g-1, and retains a high value of 136.7 mA h g-1 after 500 cycles. The present work investigated the combined effect of a tunable average Mn oxidation state and unique multi-shelled cages in a controllable aerosol process.

Department(s)

Civil, Architectural and Environmental Engineering

Comments

This work was supported by the National Natural Science Foundation of China (21522602, 21776092, 91534202, 91534122, 51673063, 51672082), the Basic Research Program of Shanghai (15JC1401300, 17JC1402300), the Social Development Program of Shanghai (17DZ1200900), Shanghai City Board of education research and innovation project, and the Fundamental Research Funds for the Central Universities (222201718002).

Keywords and Phrases

Cobalt; electrolyte solution; Lithium; Manganese; Nanocage; Oxygen; Sucrose; Adsorption; Article; Controlled study; Crystal structure; Desorption; Diffusion; Electric capacitance; Electrochemical analysis; Energy dispersive X ray spectroscopy; Field emission scanning electron microscopy; Molecular stability; Oxidation; Priority journal; Pyrolysis; Storage; Substitution reaction; Synthesis; Thermogravimetry; Transmission electron microscopy; X ray photoelectron spectroscopy; X ray powder diffraction

International Standard Serial Number (ISSN)

1144-0546; 1369-9261

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique, All rights reserved.

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