Journal
ELECTROCHIMICA ACTA
Volume 155, Issue -, Pages 396-401Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.12.129
Keywords
Electrolyte additive; Graphite; In-situ coating; Interface; Silver nanoparticles
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Funding
- National Natural Science Foundation of China (NSFC) [21473120, 51272168, 21203133]
- Academic research & Industry joint innovation program of Jiangsu Province [BY2013030-02]
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The effects of silver hexafluorophosphate (AgPF6) as an electrolyte additive on the electrochemical behaviors of graphite anode are systematically studied by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The surface structure and composition of graphite electrode after electrochemical cycles are investigated through scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. It is found that Ag nanoparticles derived from electrochemical reduction of Ag+ are homogenously distributed on the graphite surface. Significant improvements on the discharge capacity, rate behavior, and low-temperature performance of graphite electrode are obtained. The reasons are associated with the decreased resistances of solid-electrolyte interface and charge-transfer process, which improve the electrode kinetics for Li+ intercalation/deintercalation. (C) 2014 Elsevier Ltd. All rights reserved.
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