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ACS Appl Mater Interfaces. 2016 Jun 22;8(24):15352-60. doi: 10.1021/acsami.6b03648. Epub 2016 May 10.

High Anodic Performance of Co 1,3,5-Benzenetricarboxylate Coordination Polymers for Li-Ion Battery.

Author information

1
School of Physics and Materials Science, Shanghai Key Laboratory of Magnetic Resonance, Engineering Research Center for Nanophotonics & Advanced Instrument (Ministry of Education), Institute of Functinal Materials, East China Normal University , Shanghai 200062, P. R. China.
2
Shanghai Synchrotron Radiation Facility (SSRF) , Shanghai 201204, P. R. China.

Abstract

We report the designed synthesis of Co 1,3,5-benzenetricarboxylate coordination polymers (CPs) via a straightforward hydrothermal method, in which three kinds of reaction solvents are selected to form CPs with various morphologies and dimensions. When tested as anode materials in Li-ion battery, the cycling stabilities of the three CoBTC CPs at a current density of 100 mA g(-1) have not evident difference; however, the reversible capacities are widely divergent when the current density is increased to 2 A g(-1). The optimized product CoBTC-EtOH maintains a reversible capacity of 473 mAh g(-1) at a rate of 2 A g(-1) after 500 galvanostatic charging/discharging cycles while retaining a nearly 100% Coulombic efficiency. The hollow microspherical morphology, accessible specific area, and the absence of coordination solvent of CoBTC-EtOH might be responsible for such difference. Furthermore, the ex situ soft X-ray absorption spectroscopy studies of CoBTC-EtOH under different states-of-charge suggest that the Co ions remain in the Co(2+) state during the charging/discharging process. Therefore, Li ions are inserted to the organic moiety (including the carboxylate groups and the benzene ring) of CoBTC without the direct engagement of Co ions during electrochemical cycling.

KEYWORDS:

Co; Li-ion battery; anode; benzenetricarboxylate; coordination polymers; shaped-controlled synthesis

PMID:
27142789
DOI:
10.1021/acsami.6b03648

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