In-Situ Cnt-Loaded Organic Cathodes for Sulfide All-Solid-State Li Metal Batteries

22 Pages Posted: 30 Nov 2022

See all articles by Fengmei Song

Fengmei Song

University of Science and Technology of China (USTC)

Zhixuan Wang

affiliation not provided to SSRN

Jiaze Lu

affiliation not provided to SSRN

Dengxu Wu

affiliation not provided to SSRN

Tenghuan Ma

University of Science and Technology of China (USTC)

Liquan Chen

affiliation not provided to SSRN

Hong Li

Chinese Academy of Sciences (CAS)

Fan Wu

affiliation not provided to SSRN

Abstract

Organic cathodes show promising advantages of extensive resources, high theoretical specific capacity, and mild synthesis conditions, etc., but suffer from low density, poor electronic conductivity, and high solubility in liquid electrolytes. Herein, an in-situ coating method is developed to overcome the above issues by realizing high-performance sulfide all-solid-state batteries with organic Li4C8H2O6 cathode. Li4C8H2O6 composite cathodes with carbon nanotubes (CNTs) and vapor grown carbon fiber (VGCF) were systematically studied to reveal that CNTs accelerate the electrochemical decomposition of sulfide electrolyte, despite the effectively improved electronic conductivity, rate capability and active material utilization. Therefore, in-situ coating of CNTs onto Li4C8H2O6 (Li4C8H2O6@CNT) is developed to further improve the contact between Li4C8H2O6 and CNTs,  but to reduce the contact of CNTs with sulfide solid electrolyte and its decomposition. As a result, the Li4C8H2O6@CNT electrode demonstrates a high capacity of 200.3 mAh/g, and a high active material utilization rate (83.4% at 0.1C). It also exhibits a specific capacity of 85.9 mAh/g at a high cathode loading of 40 wt.% and a high rate of 1C.

Keywords: all-solid-state lithium batteries, organic electrode materials, sulfide solid electrolytes, carbon nanotubes, in-situ interfacial engineering

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Suggested Citation

Song, Fengmei and Wang, Zhixuan and Lu, Jiaze and Wu, Dengxu and Ma, Tenghuan and Chen, Liquan and Li, Hong and Wu, Fan, In-Situ Cnt-Loaded Organic Cathodes for Sulfide All-Solid-State Li Metal Batteries. Available at SSRN: https://ssrn.com/abstract=4289843 or http://dx.doi.org/10.2139/ssrn.4289843

Fengmei Song

University of Science and Technology of China (USTC) ( email )

No. 96 Jinzhai Road
Hefei, 230026
China

Zhixuan Wang

affiliation not provided to SSRN ( email )

No Address Available

Jiaze Lu

affiliation not provided to SSRN ( email )

No Address Available

Dengxu Wu

affiliation not provided to SSRN ( email )

No Address Available

Tenghuan Ma

University of Science and Technology of China (USTC) ( email )

No. 96 Jinzhai Road
Hefei, 230026
China

Liquan Chen

affiliation not provided to SSRN ( email )

No Address Available

Hong Li

Chinese Academy of Sciences (CAS) ( email )

Chinese Academy of Sciences
Beijing, 100190
China

Fan Wu (Contact Author)

affiliation not provided to SSRN ( email )

No Address Available

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