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Polyimide-Derived Carbon-Coated Li4Ti5O12 as High-Rate Anode Materials for Lithium Ion Batteries.

ABSTRACT: Carbon-coated Li4Ti5O12 (LTO) has been prepared using polyimide (PI) as a carbon source via the thermal imidization of polyamic acid (PAA) followed by a 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 fewer 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).

SUBMITTER: Hsu SC 

PROVIDER: S-EPMC8196661 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature

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Polyimide-Derived Carbon-Coated Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> as High-Rate Anode Materials for Lithium Ion Batteries.

Hsu Shih-Chieh SC   Huang Tzu-Ten TT   Wu Yen-Ju YJ   Lu Cheng-Zhang CZ   Weng Huei Chu HC   Huang Jen-Hsien JH   Chang-Jian Cai-Wan CW   Liu Ting-Yu TY  

Polymers 20210521 11

Carbon-coated Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> (LTO) has been prepared using polyimide (PI) as a carbon source via the thermal imidization of polyamic acid (PAA) followed by a carbonization process. In this study, the PI with different structures based on pyromellitic dianhydride (PMDA), 4,4'-oxydianiline (ODA), and <i>p</i>-phenylenediamine (<i>p</i>-PDA) moieties have been synthesized. The effect of the PI structure on the electrochemical performance of the carbon-coated LTO has been  ...[more]

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