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Issue 26, 2020
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CVD-assisted fabrication of hierarchical microparticulate Li2TiSiO5-carbon nanospheres for ultrafast lithium storage

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Abstract

Particular recent interest has been given to the Li2TiSiO5 (LTSO) anode material owing to its low lithiation potential (0.28 V vs. Li/Li+) and decent theoretical capacity (308 mA h g−1). However, its poor electronic conductivity (∼10−7 S m−1) fundamentally limits the utilization of this material, and current strategies fail to tackle such issues in practical ways. Herein, a hierarchical microparticulate LTSO-carbon composite (LTSO/C) is fabricated by chemical vapor deposition (CVD), where microsized LTSO/C particles assembled from nanospheres guarantee a practical tap density of ∼1.3 g mL−1. Meanwhile, significantly elevated conductivity of LTSO/C (∼103 S m−1) is achieved by a thin layer (15 nm) of graphitic carbon growth on LTSO, which is theoretically catalyzed by the surface functional groups on the parent LTSO. The electrochemical characterization of LTSO/C reveals a superior graphite-like volumetric capacity of 441.1 mA h cm−3 and Li4Ti5O12-like rate capability (120.1 mA h cm−3 at 4.5 A g−1), providing inspiring guidance for designing analogous Ti or Si-based compounds for ultrafast lithium storage materials.

Graphical abstract: CVD-assisted fabrication of hierarchical microparticulate Li2TiSiO5-carbon nanospheres for ultrafast lithium storage

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Supplementary files

Article information


Submitted
09 Apr 2020
Accepted
11 Jun 2020
First published
12 Jun 2020

Nanoscale, 2020,12, 13918-13925
Article type
Communication

CVD-assisted fabrication of hierarchical microparticulate Li2TiSiO5-carbon nanospheres for ultrafast lithium storage

D. Kong, L. Shen, R. Mo, J. Liu, R. Tao, W. Shi, S. Ma, C. Zhang and Y. Lu, Nanoscale, 2020, 12, 13918
DOI: 10.1039/D0NR02821E

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