苯甲酸钠改性石墨作为锂离子电池负极材料的性能

doi:10.11896/j.issn.1005-023X.2017.018.002

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Abstract Graphite electrode was modified with different concentrations of sodium benzoate (C₇H₅O₂Na) solutions for application as an anode material for lithium ion battery. The electrochemical characterization of graphite modified with sodium benzoate was carried out by galvanostatic charge/discharge test, electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Results showed that the graphite modified with C₇H₅O₂Na exhibits significantly better cycle efficiency and greater reversible capacity than original graphite, and the first reversible charge/discharge specific capacity of modified graphite anode approaches 293.9 mAh/g and 326.4 mAh/g at 0.5C, higher than that of untreated graphite. The reason is that electrolyte interface film formed on the graphite surface could hinder the graphite expansion and benefit Li⁺migration. Simultaneously, quantum chemistry method was cited for calculating the lowest-unoccupied (LUMO) and highest-occupied (HOMO) molecular orbital energies. All supporting surface analyses and electrochemical results demonstrated the optimum concentrations of C₇H₅O₂Na modified graphite electrodes are 1wt%. Moreover, the effects of modified graphite electrodes on electrochemical properties of batteries also were discussed at elevated temperature and under the optimum C₇H₅O₂Na concentration.

Key words： modified graphite sodium benzoate quantum chemistry method elevated temperature property lithium ion battery anode material

Published: 08 May 2018

CLC number:

TB34

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	Articles by authors
	ZHANG Ting
	LI Aiju
	ZHANG Litian
	CHEN Hongyu

Cite this article:

ZHANG Ting,LI Aiju,ZHANG Litian, et al. Characterization of Graphite Modified with Sodium Benzoate as Anode Material for Lithium Ion Battery^*[J]. Materials Reports, 2017, 31(18): 5-10.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.018.002 OR http://www.mater-rep.com/EN/Y2017/V31/I18/5

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