Effect of different oxidants on properties of tin-graphite composite anode material for lithium-ion battery

• Published in: Ionics Vol. 26; no. 2; pp. 601 - 606
• Main Authors: Dai, Yongqi, Li, Xuetian, Yu, Lina, Li, Axiang, Ma, Mengdi, Shao, Hongmei, Shao, Zhongcai
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.02.2020; Springer Nature B.V
• Subjects: Anode effect; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Discharge; Doping; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrode materials; Energy Storage; Graphite; Hydrogen peroxide; Lithium; Lithium-ion batteries; Morphology; Optical and Electronic Materials; Original Paper; Oxidation; Oxidizing agents; Properties (attributes); Rechargeable batteries; Renewable and Green Energy; Sulfuric acid; Anode material; Lithium-ion battery; Graphite oxide; Electrochemical property
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-019-03227-7

In this paper, oxidation doping modification of tin-graphite composite anode material, discussing the effect of doping different oxidants on the properties of composites. The structure and morphology were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrochemical properties of the samples were investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge and discharge tests. The results showed that the oxidation effect of H 2 SO 4 was better than HNO 3 and H 2 O 2 . When the tin-graphite composite was oxidized by H 2 SO 4 , the material had better electrochemical properties, of which initial specific discharge capacity reached 859 mAh·g −1 at the rate of 0.1C, increasing by 113 and 76 mAh·g −1 compared with the HNO 3 and H 2 O 2 . The initial discharge specific capacities at rates of 0.2, 0.5, and 1C were 809, 761, and 627 mAh·g −1 .