Amorphous GeO2@C composite anodes for long cycling stability and performance in Li-ion batteries

• Published in: Ionics 2024-02, Vol.30 (2), p.697-708
• Main Authors: Wang, Guanzheng, Lei, Huazhi, Wang, Zheng, Yuan, Zhentao, Zhan, Zhaolin, Li, Lu, Wang, Xiao
• Format: Article
• Language: English
• Subjects: Amorphous materials; Anodes; Anodic protection; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Current density; Discharge; Electrical resistivity; Electrochemical analysis; Electrochemistry; Electrode materials; Embedding; Energy Storage; Germanium oxides; Lithium-ion batteries; Optical and Electronic Materials; Rechargeable batteries; Renewable and Green Energy
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-023-05355-7

Amorphous GeO 2 @C anode materials were successfully prepared from commercial GeO 2 and C 6 H 12 O 6 .H 2 O by a hydrothermal method combined with sintering under nitrogen atmosphere protection. The anode materials showed an ideal spherical shape of about 3 μm and their surface was uniformly covered with C. GeO 2 @C composite anodes exhibited better storage performance for Li-ion batteries. The discharge-specific capacities of GeO 2 @C-3 sample were 1143, 1049, 776, 551, and 308 mAh g -1 at current densities of 0.2, 0.5, 1, 2, and 5 A g -1 , and restored to 1136 mAh g -1 when the current density returned to 0.2 A g -1 . The reversible specific capacity was 756 mAhg -1 after 1000 cycles at a current density of 1 A g -1 . The GeO 2 @C anode was stable in the process of charge and discharge, and no obvious pulverization occurred. GeO 2 @C composites stabilized the electrochemical properties through carbon and amorphous structure to improve the overall electrical conductivity in Li + embedding/de-embedding processes.