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A general strategy to construct uniform carbon-coated spinel LiMn2O4 nanowires for ultrafast rechargeable lithium-ion batteries with a long cycle life.

Nanoscale (2015-07-17)
Weiwei Sun, Huiqin Liu, Yumin Liu, Gongxun Bai, Wei Liu, Shishang Guo, Xing-Zhong Zhao
ABSTRACT

Control over one-dimensional growth of spinel-type LiMn2O4 nanowires is challenging in the area of materials science due to their cubic crystal structure. The current strategy is to use a self-support template to fabricate LiMn2O4 nanowires, which is time-consuming and limits their large-scale commercial production. In this paper, we propose a general strategy to construct well-defined LiMn2O4 nanowires terminated with amorphous carbon at the edges by an ingenious method without using any template. Benefited from its unique carbon-coated nanowire structure, the electrode exhibits a capacitor-like rate performance and battery-like high capacity for long-time cycling. Even after 1500 cycles at an extremely high current density of 30 C, approximately 82% of its initial capacity can still be retained. Significantly, the strategy reported here will be beneficial and revelatory to manufacture other extensive one-dimensional robust carbon-decorated nanowires, paving new ways for future developments of ultrafast rechargeable lithium-ion batteries.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1-Methyl-2-pyrrolidinone, anhydrous, 99.5%
Sigma-Aldrich
2-Pyrrolidinone, ≥99%
Sigma-Aldrich
2-Pyrrolidinone, 99%
Sigma-Aldrich
Lithium manganese oxide, spinel, powder, <0.5 μm particle size (BET), >99%
Sigma-Aldrich
Lithium manganese(III,IV) oxide, electrochemical grade