有机硫化合物
电化学
材料科学
电致变色
硫黄
阴极
膜
氧化还原
Nafion公司
单体
聚合物
无机化学
化学工程
化学
电极
物理化学
冶金
复合材料
生物化学
工程类
作者
Shuai Tang,Qiliang Chen,Yubing Si,Wei Guo,Mao Bing-Wei,Yongzhu Fu
标识
DOI:10.1002/adma.202100824
摘要
Abstract Organosulfurs are promising cathode materials for rechargeable metal batteries due to their high capacities, diverse structures, and electrochemical properties. Herein, the electrochemical behavior of three organosulfur compounds, i.e., 4,4′‐thiobisbenzenethiol (TBBT), 1,4‐benzenedithiol (1,4‐BDT), and diphenyl disulfide (DPDS), is revealed in room‐temperature rechargeable sodium (Na) batteries, which show significantly improved performances when sodiated Nafion membranes are used. Large oligomers of organosulfur can be formed during charging, and they are readily blocked by the nanosized ion‐conducting clusters in the Nafion membrane. In addition, large organosulfur monomers can also be blocked. Only 5.4% of TBBT diffuses through the Nafion membrane after 800 h. The Na|TBBT cell sustains 77% of the theoretical capacity after 300 cycles (2420 h). Moreover, the Na|TBBT redox flow cell shows promising rechargeability. Due to the medium molecular size, the organosulfur oligomers are expected to provide a new avenue to develop high‐capacity chalcogen cathodes, besides inorganic S and S‐containing polymers.
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