920874-60-8Relevant articles and documents
Mellitic Triimides Showing Three One-Electron Redox Reactions with Increased Redox Potential as New Electrode Materials for Li-Ion Batteries
Kwon, Ji Eon,Lee, Kyunam,Min, Dong Joo,Park, Soo Young
, (2020)
The mellitic triimide (MTI) bearing three imide groups on a benzene core with C3 symmetry is proposed as a new building block for organic electrode materials in lithium-ion batteries. MTI was anticipated to deliver a higher theoretical specific capacity of up to 282 mAh g?1 with increased reduction potentials compared with the well-known pyromellitic diimide building block bearing two imide groups because the additional imide group can accept one more electron and provide an electron-withdrawing effect. A model compound, ethyl-substituted mellitic triimide (ETTI), shows three well distinguished and reversible one-electron redox reactions at ?0.97, ?1.62, and ?2.34 V versus Ag/Ag+ in 0.1 m tetrabutylammonium hexafluorophosphate electrolyte, but the redox potentials were increased in 2 m lithium bis(trifluoromethanesulfonyl)imide electrolyte: ?0.60 V, ?0.86 V, and ?1.42 V vs. Ag/Ag+. The DFT calculations revealed that the unique C3 symmetric structural design leads to the higher reduction potential of MTI in the Li-based electrolyte by formation of a stable 7-membered ring with a Li ion and the two carbonyl oxygen atoms from the adjacent imide groups. In a Li-ion coin cell, the ETTI electrode delivered a specific capacity of 176 mAh g?1, corresponding to 81 % of capacity utilization, with three clear voltage plateaus. The higher average discharge voltage (2.41 V vs. Li/Li+) of ETTI allows it to deliver one of the highest specific energies (421 Wh kg?1) among reported diimide-based electrode materials. Finally, its redox mechanism was investigated by ex situ FTIR measurements and DFT calculations.
Benzene Triimide Cage as a Selective Container of Azide
Tuo, De-Hui,Ao, Yu-Fei,Wang, Qi-Qiang,Wang, De-Xian
, p. 7158 - 7162 (2019)
Benzene triimide (BTI, or mellitic triimide) is a C3-symmetric backbone with a highly electron-deficient, extended πsurface and three easy functionalization sites. Here, we report the first BTI-based cage composed of two face-to-face BTIs pilla
