Effect of heat treatment temperature on microstructure and electrochemical properties of hollow carbon spheres prepared in high-pressure argon

Bulletin of materials science

Boyang Liu³  Dechang Jia¹  Yingfeng Shao⁴  Yun Zhou³  Pengjian Zuo⁴  Jingwei Zhang² 

[1] Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China$$Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, ChinaInstitute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, China$$;Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, China$$Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, ChinaLogistics Engineering College, Shanghai Maritime University, Shanghai 201306, China$$;Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China$$Institute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, ChinaInstitute of Marine Materials Science and Engineering, Shanghai Maritime University, Shanghai 201306, China$$;Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China$$Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, ChinaDepartment of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China$$

关键词: Hollow carbon spheres;    heat treatment;    gas pressure;    lithium ion battery.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Heat treatment was carried out between 800 and 1200°C to investigate its effects on the microstructure and electrochemical properties of the hollow carbon spheres (HCSs) prepared in high-pressure argon. Samples were characterized by X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy and N₂ adsorptionâ€�?�desorption isotherms. The graphitization of the HCSs was improved with increase of heat treatment temperature. Mesopores of 𝑐ð�?��?. 4 nm in diameter were created on the HCSs after the heat treatment. The results of electrochemical performance measurements for the HCSs as anode material for lithium ion batteries indicate that the discharge capacity of the HCSs is improved after heat treatment at 800°C compared with the as-prepared HCSs and have a maximum value of 357 mAh/g and still retains 303 mAh/g after 40 cycles. However, the discharge capacity of the HCSs decreases and the cycling performance is improved with the increase of heat treatment temperature.

【 授权许可】

Unknown