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Surfacing Amorphous Ni-B Nanoflakes on NiCo2O4 Nanospheres as Multifunctional Bridges for Promoting Lithium Storage Behaviors

Abstract

Transition metal oxides (TMO) have gained enormous research interests as the negative materials of next generation lithium-ion batteries due to their higher energy density, lower cost and better eco-friendliness. However, they are subjected to low electronic conductivities and dramatic volume change during charge/discharge and there is also great challenge to realize the TMO electrodes with satisfactory LIB performances. In this work, amorphous nickel-boride (Ni-B) was introduced into porous NiCo2O4 nanospheres by an in situ solution growth route for the first time, to overcome the existed issues. The coated Ni-B component could not only function as anchors for NiCo2O4 nanospheres to suppress the severe volume expansion, but also act as effective electron-conducting bridges to promote fast electron/charge transfer. Furthermore, the existence of abundant of mesopores centered at ~6.5 nm in this composite could effectively suppress the severe volume variations in the lithiation/delithiation process. As expected, the NiCo2O4@Ni-B composites delivered a high reversible capacity of 1221 mAh g−1 at 0.2 A g−1, and 865 mAh g−1 at 0.5 A g−1 over 500 cycles; more impressively, at high rate of 5 A g−1, a capacity of 648 mAh g−1 could be also obtained, showing its good rate capability. As a result, these results demonstrated an effective and facile way to design conversion-type negative electrode materials with superior lithium storage properties.

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Publication details

The article was received on 07 Sep 2019, accepted on 01 Nov 2019 and first published on 04 Nov 2019


Article type: Paper
DOI: 10.1039/C9NR07733B
Nanoscale, 2019, Accepted Manuscript

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    Surfacing Amorphous Ni-B Nanoflakes on NiCo2O4 Nanospheres as Multifunctional Bridges for Promoting Lithium Storage Behaviors

    M. Li, Q. Zhou, C. Ren, N. Shen, Q. Chen, J. Zhao, C. Guo, L. Zhang and J. Li, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR07733B

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