Cobalt tetrapyridinoporphyrazine nanoparticulates anchored on carbon nanotubes for long-voltage Li/SOCl2 batteries

• Published in: Electrochimica acta Vol. 295; pp. 569 - 576
• Main Authors: Li, Kang, Xu, Zhanwei, Shen, Xuetao, Yao, Kai, Zhao, Jianshe, Zhang, Ronglan, Zhang, Jun, Wang, Li, Zhu, Jianfeng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2019
• Subjects: Active sites; Cobalt tetrapyridinoporphyrazine; Lithium/thionyl chloride battery; Voltage platform; Lithium/thionyl chloride battery; Voltage platform; Active sites; Cobalt tetrapyridinoporphyrazine
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2018.10.178

Commercial lithium/thionyl chloride (Li/SOCl2) batteries cannot meet the 3.15 V platform required for most instruments. A hovenia acerba-like assembly constructed with cobalt tetrapyridinoporphyrazine of thickness of 5–15 nm is anchored on acid-functionalized multi-walled carbon nanotubes (CoTAP/MWCNTs), which were prepared using an in situ solid synthesis process. The discharge time of Li/SOCl2 batteries with a voltage greater than 3.15 V catalyzed by CoTAP/MWCNTs is found to be 11 min longer than batteries without catalysts and 4 min longer than those catalyzed by CoTAP alone. The energy of Li/SOCl2 batteries with a voltage greater than 3.15 V catalyzed by CoTAP/MWCNTs is discovered to be 11.44-times higher than batteries with AF-MWCNTs and 6.17-times higher than those catalyzed by bulk CoTAP. This is due to the fact that more CoTAP ultrafine nanoparticulates are anchored on the AF-MWCNTs. These nanoparticulates provide more active sites for the catalytic reaction of SOCl2. The assemblies are shown to have an adsorption-coordination effect on Li ions and to delay the deposition of lithium chloride passive films enhancing battery voltage platforms. A hovenia acerba-like assembly constructed with cobalt tetrapyridinoporphyrazine of thickness of 5–15 nm is anchored on acid-functionalized multi-walled carbon nanotubes (CoTAP/MWCNTs), which were prepared using an in situ solid synthesis process. The discharge time of Li/SOCl2 batteries with a voltage greater than 3.15 V catalyzed by CoTAP/MWCNTs is found to be 11 min longer than batteries without catalysts and 4 min longer than those catalyzed by CoTAP alone. [Display omitted] •The CoTAP/MWCNTs display hovenia acerba-like nanostructure, providing more reaction active sites.•The CoTAP/MWCNTs delay the deposition of LiCl passive film for enhancing the reduction reaction of SOCl2.•The discharge time of batteries with a voltage greater than 3.15 V catalyzed by CoTAP/MWCNTs is 11 minutes.•The discharge energy of batteries catalyzed by the CoTAP/MWCNTs is 74% higher than pure CoTAP.