The hierarchical functional layers on high-capacity lithium-excess cathodes for superior lithium ion batteries

Document Type

Conference Proceeding

Publication Date

1-1-2013

Abstract

Li-excess layered Li[Li0.2Mn0.54Ni 0.13Co0.13]O2 (LMNCO) nanoparticles are facilely synthesized using a surfactant-assisted dispersion method. We synthesize a novel core-shell structure cathode consisting of Li-excess LMNCO as core and Listoichiometric LiCoO2 as shell, and its electrochemical property is optimized by tailoring weight content. In addition, the effect of ultrathin and conformal oxide coatings via atomic layer deposition (ALD) on improving electrochemical performance of LMNCO electrodes is simultaneously evaluated via tuning the composition. Finally, electrochemical performance of Li-excess cathode material can be maximized by surface modification with hierarch functional layers composed of 10 wt.% LiCoO2 shell (∼10 nm thick) and six ZrO2 ALD layers (∼1 nm thick), which delivers very high initial discharge capacities of 296.4 and 104.2 mAh/g at 0.1C and 10C, and can retain 184.0 mAh/g at 1C after 100 electrochemical cycles. Such remarkably improved cycleabilitiy and rate capability can be attributed to the synergic effect from hierarch functional coatings. © 2014 The Electrochemical Society.

Publication Source (Journal or Book title)

ECS Transactions

First Page

3

Last Page

12

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