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An Aluminum–Sulfur Battery with a Fast Kinetic Response
Author(s) -
Yang Huicong,
Yin Lichang,
Liang Ji,
Sun Zhenhua,
Wang Yuzuo,
Li Hucheng,
He Kuang,
Ma Lipo,
Peng Zhangquan,
Qiu Siyao,
Sun Chenghua,
Cheng HuiMing,
Li Feng
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201711328
Subject(s) - dissociation (chemistry) , chemistry , sulfur , arrhenius equation , electrochemistry , reagent , reversible reaction , density functional theory , aluminium , kinetic energy , current density , inorganic chemistry , activation energy , analytical chemistry (journal) , computational chemistry , electrode , catalysis , organic chemistry , physics , quantum mechanics
The electrochemical performance of the aluminum‐sulfur (Al‐S) battery has very poor reversibility and a low charge/discharge current density owing to slow kinetic processes determined by an inevitable dissociation reaction from Al 2 Cl 7 − to free Al 3+ . Al 2 Cl 6 Br − was used instead of Al 2 Cl 7 − as the dissociation reaction reagent. A 15‐fold faster reaction rate of Al 2 Cl 6 Br − dissociation than that of Al 2 Cl 7 − was confirmed by density function theory calculations and the Arrhenius equation. This accelerated dissociation reaction was experimentally verified by the increase of exchange current density during Al electro‐deposition. Using Al 2 Cl 6 Br − instead of Al 2 Cl 7 − , a kinetically accelerated Al‐S battery has a sulfur utilization of more than 80 %, with at least four times the sulfur content and five times the current density than that of previous work.