An Aluminum‐Benzo[1,2‐b:4,5‐b’]dithiophene‐4,8‐dione Organic Rechargeable Battery Featuring Low Self‐Discharge

Abstract

The achievable cell-level specific energy density of existing aluminum-ion batteries (AIBs) employing AlCl 4À intercalation type cathodes is intrinsically limited by the chloroaluminate anolyte. Towards achieving AIBs with higher specific energy, it is imperative to explore alternative cell chemistries that fundamentally tap the capacity of Al metal anode. Here, we report a benzo[1,2-b:4,5-b']dithiophene-4,8-dione (BDTD) organic electrode material with favorable AlCl 2 + intercalation mecha-nism. This BDTD cathode delivers a specific capacity of 143 mAh g À 1 , and the resulting battery exhibits a well-defined voltage plateau at ~1.2 V. This characteristic voltage plateau is mainly driven by the predominant diffusive charge storage in BDTD cathode, which accounts for up to 85 % of the total charge-storage contribution. As a result, the BDTD cathode demonstrates exceptional self-discharging resistance by recovering > 95 % of its capacity upon 24-h resting.

“All-in-one” polypyrrole pillar hybridization flexible membranes on multimodal tactile sensors for wearable energy-storage devices and human–machine interfaces

“…Meanwhile, b = 1 indicates non-diffusion-controlled capacitive behavior. 46 Besides, the b-values for anodic and cathodic peaks were 0.79 and 0.80, respectively, (Fig. 7c), suggesting that the diffusion and capacitive behaviour were almost equal.…”

Organic Cathode Materials for Rechargeable Aluminum‐Ion Batteries

“…Anthraquinone organic compounds have shown good electrochemical activity, anthraquinone derivatives also contain carbonyl sites (C=O) to achieve ion storage. Wang et al [63] reported a benzo[1,2-b:4,5-b']dithiophene-4,8-dione (BDTD) organic cathode material with an elongated plate-like morphology (Figure 11a,b). The separator was modified by conductive carbon Super P to alleviate the accidental shuttle of soluble BDTD species and improve the overall conductivity of the battery.…”

“…Anthraquinone organic compounds have shown good electrochemical activity, anthraquinone derivatives also contain carbonyl sites (C=O) to achieve ion storage. Wang et al [63] . reported a benzo[1,2‐b:4,5‐b’]dithiophene‐4,8‐dione (BDTD) organic cathode material with an elongated plate‐like morphology (Figure 11a,b).…”

“…The CS − , AlCl 2 − , and C 2 H 6 N + ToF‐SIMS mappings of d) the discharged electrode, and e) the charged electrode. Reproduced with permission [63] . Copyright 2022, Wiley‐VCH.…”

“…Reproduced with permission. [63] Copyright 2022, Wiley-VCH. f) Adsorption energies of BDTO molecule and Al 3 + .…”