High-performance realized in earth abundant Bi2S3 anode for Li-ion batteries via carbon film in-situ encapsulating

• Published in: Journal of power sources 2024-12, Vol.622, p.235338, Article 235338
• Main Authors: Yang, Cheng-Lu, Guo, Jun, Gao, Chao, Chen, Bu-Ming, Huang, Hui, Xu, Ruidong
• Format: Article
• Language: English
• Subjects: Bismuth sulfide; Carbon composites; Electrochemical performance; Full cell
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2024.235338

Bi2S3 has been considered a promising anode material in the field of energy storage due to its high theoretical capacity. Nevertheless, a significant capacity decline has been observed during the discharge process, attributed to the disruption of the microstructure. To address this issue, Bi2S3@Cppy nanocomposites have been deliberately designed in this study to enhance the structural stability of the anode and enhance the discharge capacity. The Bi2S3@Cppy composite exhibits a reversible specific capacity of 388.1 mAhg⁻1 after 100 cycles at a current density of 0.1 Ag⁻1, which is five times higher than that of bare Bi2S3. Furthermore, a reversible capacity of 363.8 mAhg⁻1 has been achieved after 800 cycles at a current density of 0.5 Ag⁻1. In-situ X-ray diffraction has been employed to investigate the mechanism of lithium-ion storage during the charging and discharging processes. Subsequently, a full cell comprising a Li1.2Ni0.13Co0.13Mn0.64O2 cathode and a Bi2S3@Cppy anode has been fabricated, demonstrating a capacity of 100 mAhg⁻1 after 100 cycles at 0.05 Ag⁻1. This approach is anticipated to enhance the discharge capacity and cycling stability in various other anode materials. •Amorphous carbon layer coated Bi2S3 composite anodes were fabricated.•The capacity of 363.8 mAh g−1 was obtained at 0.5 A g−1 for Bi2S3@Cppy.•A full cell of Li1.2Ni0.13Co0.13Mn0.64O2//Bi2S3@Cppy was fabricated.