卤素
密度泛函理论
材料科学
重量分析
拉曼光谱
离子
阴极
富勒烯
分子
铝
化学工程
纳米技术
无机化学
计算化学
物理化学
有机化学
化学
复合材料
烷基
物理
光学
工程类
作者
Chenli Huang,Ying Yang,Mengyang Li,Xiaoqun Qi,Changwang Pan,Kun Guo,Lipiao Bao,Xing Lu
标识
DOI:10.1002/adma.202306244
摘要
Restricted by the available energy storage modes, currently rechargeable aluminum-ion batteries (RABs) can only provide a very limited experimental capacity, regardless of the very high gravimetric capacity of Al (2980 mAh g-1 ). Here, a novel complexation mechanism is reported for energy storage in RABs by utilizing 0D fullerene C70 as the cathode. This mechanism enables remarkable discharge voltage (≈1.65 V) and especially a record-high reversible specific capacity (750 mAh g-1 at 200 mA g-1 ) of RABs. By means of in situ Raman monitoring, mass spectrometry, and density functional theory (DFT) calculations, it is found that this elevated capacity is attributed to the direct complexation of one C70 molecule with 23.5 (super)halogen moieties (superhalogen AlCl4 and/or halogen Cl) in average, forming (super)halogenated C70 ·(AlCl4 )m Cln-m complexes. Upon discharging, decomplexation of C70 ·(AlCl4 )m Cln-m releases AlCl4- /Cl- ions while preserving the intact fullerene cage. This work provides a new route to realize high-capacity and long-life batteries following the complexation mechanism.
科研通智能强力驱动
Strongly Powered by AbleSci AI