An Insoluble Anthraquinone Dimer with Near‐Plane Structure as a Cathode Material for Lithium‐Ion Batteries

Abstract

Figure 4. (a) CV curveso ft he BAQBc athode in the first cycle at as can rate of 0.1 mV s À1 and in ap otentialrange of 1.5-3.5 V; (b) corresponding galvanostatic discharge/charge profilesa t0.2 Cr ate (1 C = 218 mA g À1 )i nits first cycle;( c) cycling performance and Coulombic efficiency of AQ and BAQB at 0.2 C; (d) Nyquistp lots of BAQBa fter different cycles measured by in situ EIS;(e) rate capability and (f) galvanostatic discharge and chargep rofiles of BAQBa td ifferent currentd ensities.Figure 5. (a) Reversible electrochemical redox mechanism of BAQB/Li4BAQB; (b) galvanostatic discharge/charge profiles of BAQBw ith marked points at different discharge and recharge states (0.2 C);(c) ex situ FTIR spectrao f BAQB for the samples taken at different states as marked in Figure5b.

Soluble Organic Cathodes Enable Long Cycle Life, High Rate, and Wide‐Temperature Lithium‐Ion Batteries

“…TAQB was synthesized using the previously reported palladium‐catalyzed Suzuki coupling reaction method. [ 57 ] Under the protection of nitrogen atmosphere, 2‐bromoanthraquinone (AQBr) (1.13 g, 3.94 mmol), 1,3,5‐ tris (4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolan‐2‐yl)benzene (TTDB) (0.50 g, 1.52 mmol), K 2 CO 3 (0.76 g, 5.50 mmol), and Pd 0 (PPh 3 ) 4 (0.13 g, 0.11 mmol) were added in a fully dried Schlenk flask. Then 40 mL toluene and 6 mL methanol were added into the flask and the mixture was stirred at 90 °C under nitrogen.…”

Design strategies for organic carbonyl materials for energy storage: Small molecules, oligomers, polymers and supramolecular structures

“…An anthraquinone dimer, 1,4-bis(9,10anthraquinonyl)benzene (BAQB) (6) can be formed through C-C single bonds while maintaining low steric hindrance. 34 Such a molecular structure will remain relatively planar with small twist angles between adjacent aromatic rings, which the authors deemed a near-plane structure. The main advantage of this near-planar molecular design of anthraquinone dimers is that the intermolecular π-π stacking is enhanced, resulting in the formation of insoluble BAQB.…”

“…Yang et al demonstrated another clever approach to address the dissolution issue on anthraquinone derivatives. An anthraquinone dimer, 1,4‐bis(9,10‐anthraquinonyl)benzene (BAQB) ( 6 ) can be formed through C–C single bonds while maintaining low steric hindrance 34 . Such a molecular structure will remain relatively planar with small twist angles between adjacent aromatic rings, which the authors deemed a near‐plane structure.…”

Electrochemical Preparation of Poly(N‐anthraquinoyl pyrrole) as High‐Performance Cathode Materials for Organic Lithium‐Ion Batteries

“…[ 19 ] Especially, as one of the n‐type carbonyl compounds, anthraquinone shows a high theoretical capacity (260 mAh g −1 ), suitable redox potential, and fast two‐electron redox kinetics, making it one of the most attractive cathode materials. [ 20 ] However, just like other organic electrode materials, anthraquinone also suffered from low rate performances, rapid capacity decay, and short cycle life due to the poor conductivity and undesirable dissolution in organic electrolytes. [ 21–23 ] For example, the anthraquinone shows an initial specific capacity of 193 mAh g −1 and a fast capacity degradation with only 14 mAh g −1 remained after 100 cycles.…”