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Sacrificial templating synthesis of rod-like LiNixMn2-xO4 spinels and their improved cycling performance

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5 Author(s)
Chenhao Zhao ; Key Lab. for Colloid & Interface Chem. of Educ. Minist., Shandong Univ., Jinan, China ; Wenpei Kang ; Xinxin Wang ; Shiqiang Zhao
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Nanofabrication of crystalline materials has been well recognised as one of the most efficient pathways to improve the electrochemical performance of an electrode on the principle of lithium-ion insertion/extraction depth. Herein, it is reported that freshly prepared β-MnO2 nanorods have been successfully used as sacrificial templates to synthesise the rod-like spinels of pristine LiMn2O4 with high purity and good crystallinity. Under the optimum sintering temperature of 750°C for 10°h, the presence of doping reactant Ni(CH3COO)2·4H2O can greatly weaken the templating effectiveness of β-MnO2 nanorods, effectively resulting in LiNixMn2-xO4 (x=0.025, 0.05 and 0.1) samples with a relatively short aspect ratio. Galvanostatic charge=discharge tests showed that the undoped rods could acquire an initial discharge capacity of 125.9=mAh/g at 1=C and the corresponding capacity retention of 75.3= after 100 cycles. Interestingly, with the increase of element-doped amount, the resulting LiNixMn2-xO4 displayed a gradually improved cyclability at the charge-discharge rate of 1 C at room temperature.

Published in:

Micro & Nano Letters, IET  (Volume:7 ,  Issue: 6 )

Date of Publication:

June 2012

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