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Carbon-coated Li4Ti5O12 (LTO) has been prepared using polyimide (PI) as a carbon source via the thermal imidization of polyamic　acid (PAA) followed by carbonization process. In this study, the PI with different structures based on pyromellitic dianhydride (PMDA), 4,4’-oxydianiline (ODA), and p-phenylenediamine (p-PDA) moieties have been synthesized. The effect of the PI structure on the electrochemical performance of the carbon-coated LTO has been investigated. The results indicate that the molecular arrangement of PI can be improved when the rigid p-PDA units are introduced into the PI backbone. The carbons derived from the p-PDA based PI show a more regular graphite structure with less amount of defects and higher conductivity. As a result, the carbon-coated LTO exhibits a better rate performance with a discharge capacity of 137.5 mAh/g at 20 C, which is almost 1.5 times larger than that of bare LTO (94.4 mAh/g).

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Li4Ti5O12; polyimide; carbon coating; lithium ion battery; rate performance

Date published: 2021-05-21

Publisher: MDPI AG

Journal:

• Polymers (ISSN: 20734360) vol. 13 issue. 11 p. 1672-1672

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.3390/polym13111672

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Updated at: 2024-01-05 22:12:24 +0900

Published on MDR: 2023-03-17 12:00:10 +0900