Polyanthraquinone as a Reliable Organic Electrode for Stable and Fast Lithium Storage

Abstract

In spite of recent progress,t here is still al acko f reliable organic electrodes for Li storage with high comprehensive performance,e specially in terms of long-term cycling stability.Herein, we report an ideal polymer electrode based on anthraquinone,n amely,p olyanthraquinone (PAQ), or specifically,poly(1,4-anthraquinone) (P14AQ) and poly(1,5-anthraquinone) (P15AQ). As al ithium-storage cathode,P 14AQ showed exceptional performance,including reversible capacity almost equal to the theoretical value (260 mA hg À1 ; > 257 mA hg À1 for AQ), av ery small voltage gap between the charge and discharge curves (2.18-2.14 = 0.04 V), stable cycling performance (99.4 %c apacity retention after 1000 cycles), and fast-discharge/charge ability (release of 69 %ofthe low-rate capacity or 64 %o ft he energy in just 2min). Exploration of the structure-performance relationship between P14AQa nd related materials also provided us with deeper understanding for the design of organic electrodes.

Combining Quinone Cathode and Ionic Liquid Electrolyte for Organic Sodium-Ion Batteries

“…[1][2][3][4][5][6] However, quinone cathodes are easily soluble in organic solvent-based electrolyte (e.g., carbonate and ether solvents), incurring poor cycle life, low Coulombic efficiency, and unfavorable shuttling problems. [7][8][9] Strategies to surmount these issues include molecular polymerization, [10][11][12] chemical modification, [13][14][15] porous carbon anchoring, 16,17 and using liquid-free electrolyte. [18][19][20] Nonetheless, polymerization, chemical modification, and carbon anchoring require complex procedures and largely decrease the deliverable capacity because of an increment of inactive groups.…”

Recent Progress in Multivalent Metal (Mg, Zn, Ca, and Al) and Metal‐Ion Rechargeable Batteries with Organic Materials as Promising Electrodes

“…However, gradual deterioration of PAQS 7 was observed during the cycling (inset of Figure a). Inspired by the strategy that different linking methods of anthraquinone monomers could lead to different electrochemical behaviors of polymer electrodes (vs Li metal), Liao et al carried out an investigation on the Mg battery performance of two poly(anthraquinone) derivatives: poly(1,4‐anthraquinone) (14PAQ) 8 and poly(2,6‐anthraquinone) (26PAQ) 9 . In contrast to the sharp capacity decay of PAQS 7 , 14PAQ 8 and 26PAQ 9 provided greatly improved stability and long‐term cycling.…”

Organic Carbonyl Compounds for Sodium‐Ion Batteries: Recent Progress and Future Perspectives

“…[21] Based on the structuralc haracteristics of carbonyl compounds, especially for dianhydride, constructing polyimides (PIs) is af ascinating choice. [21] Based on the structuralc haracteristics of carbonyl compounds, especially for dianhydride, constructing polyimides (PIs) is af ascinating choice.…”

“…The solubility of small-molecule organic compounds in aprotic electrolyte resulted in seriousc apacity fading,w hich limits their practical application.I na ddition to forming/introducing salt, constructingp olymers is alsoo ne effective strategy to solve this problem. [21] Based on the structuralc haracteristics of carbonyl compounds, especially for dianhydride, constructing polyimides (PIs) is af ascinating choice. [22] On one hand, its synthetic method is easy without tedious and sophisticated synthetic reactions and processes.…”