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Abundant grain boundaries activate highly efficient lithium ion transportation in high rate Li4Ti5O12 compact microspheres

Abstract

It is a huge challenge for high tap density electrode to achieve high volumetric energy density but do not compromise the ionic transportation. Herein, we prepared compact LTO microspheres consist of densely packed primary nanoparticles. The real space distribution of lithium ions inside the compact LTO was revealed by using the scanning transmission electron microscopy with electron energy loss spectroscopy (STEM-EELS) to identify the function of grain boundaries for lithium ion transportation during lithiation. The as-prepared LTO microspheres possess a high tap density (1.23 g cm-3) and an ultra-small specific surface area (2.40 m2 g-1). Impressively, the compact LTO microspheres present excellent electrochemical performance. At a high rate of 5 C, 10 C and 20 C, the LTO microspheres show specific capacity of 146.6, 138.2 and 111 mA h g-1, respectively. The capacity retention still remains 97.8% at 5 C after 500 cycles. The STEM-EELS results present that the lithiation reaction of LTO are firstly initiated at grain boundaries during high rate lithiation process and then diffused to bulk area. The abundant grain boundaries in compact LTO microspheres can form a highly efficient conductive network to preferentially transport the ions, which contributes to high volumetric and gravimetric energy density simultaneously.

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Publication details

The article was received on 19 Oct 2018, accepted on 05 Dec 2018 and first published on 05 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10072A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Abundant grain boundaries activate highly efficient lithium ion transportation in high rate Li4Ti5O12 compact microspheres

    J. Ma, Y. Wei, L. Gan, C. Wang, H. Xia, W. Lv, J. Li, B. Li, Q. H. Yang, F. Kang and Y. He, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA10072A

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