Intermediate-motivated charge transfer via alternate dipoles accelerating the deep redox of iodine/sulfur/molybdenum for high-performance multiple ion batteries
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引用次数: 0
Abstract
Sodium-sulfur and sodium-iodine batteries are attractive due to their low cost and high capacities. However, they suffer from polysulfide/polyiodide dissolution and fast capacity decay. To solve these issues, herein, an organic species-intercalated layered MoS2 with oxygen-dopant (Org-MoS2) was designed for the iodine encapsulation. The chemically-bonded S2− from the S–Mo–S layer can not only stabilize the in situ generated I+ intermediate to boost the redox kinetics and deep transformations of 2I− ↔ I2 ↔ 2I+, but also undergo the conversion of S2− ↔ Sδ− in the high voltage range of 1.5–3.4 V without structural collapse and shuttle effect. That is owning to the I+-induced local charge and the electron reservoir of multi-valent Mo, which facilitate effective charge transfer via alternate dipoles of Iδ+−δ−Sδ+/δ−Oδ+−δ−Moδ+−δ−Sδ+ and promote the redox of I/S/Mo. Meanwhile, the incorporated organic species are transformed into an aromatic carbonaceous material with improved electron conductivity and thinner thickness in the cycling test accompanied by the exposure of more Mo–O–Mo linkages, resulting in an increasing ultrahigh capacity and outstanding long-term durability of Org-MoS2@I2.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy