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1D nanobar-like LiNi0.4Co0.2Mn0.4O2 as a stable cathode material for lithium-ion batteries with superior long-term capacity retention and high rate capability

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Abstract

In this work is reported the successful synthesis of 1D nanobar-like LiNi0.4Co0.2Mn0.4O2 (N-NCM), preferentially exposing the {010} electrochemically active facets. The material is obtained via a precipitation process followed by a calcination step. Upon calcination at 800 °C, the material delivers a high initial reversible capacity of 177.1 mA h g−1 at 0.1C, while at higher current densities (1C, 2C, 5C and 10C), it still delivers 152.8, 141.7, 122.7 and 104.2 mA h g−1, respectively. After 100 cycles, the material exhibits high capacity retention values, ca. 91% (0.1C) and 94% (10C). The good electrochemical performance is attributed to the synthesis design strategy leading to 1D nanobars with exposed {010} electrochemically active facets, which provide a more open structure for unimpeded Li+ migration. In addition, the diffusion pathway of lithium ions is greatly reduced because of the nano-sized bar shape. All these factors play a decisive role in achieving significantly enhanced lithium ion diffusivity, and thus superior high C-rate capability and greatly improved long-term cycling stability.

Graphical abstract: 1D nanobar-like LiNi0.4Co0.2Mn0.4O2 as a stable cathode material for lithium-ion batteries with superior long-term capacity retention and high rate capability

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Publication details

The article was received on 03 Apr 2017, accepted on 02 Jul 2017 and first published on 05 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA02888A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    1D nanobar-like LiNi0.4Co0.2Mn0.4O2 as a stable cathode material for lithium-ion batteries with superior long-term capacity retention and high rate capability

    Z. Chen, D. Chao, J. Liu, M. Copley, J. Lin, Z. Shen, G. Kim and S. Passerini, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA02888A

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