Electrochemical in battery polymerization of poly(alkylenedioxythiophene) over lithium iron phosphate for high-performance cathodes

文献信息

发布日期 2014-08-12
DOI 10.1039/C4CP02796E
影响因子 3.676
作者

Daniel Cíntora-Juárez, Carlos Pérez-Vicente, Shahzada Ahmad, José Luis Tirado


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摘要

A molecular wiring concept was induced in LiFePO4 cathodes by in battery polymerization methods. This was performed by the addition of alkylthiophene monomers over the LiFePO4-based cathode during the first charging step in lithium test cells. The driving force for the in battery polymerization of the monomers was supplied by the oxidizing current and by the physical contact of monomers with delithiated Li1−xFePO4 formed during the charging of the battery. The resulting molecularly engineered cathodes give higher initial capacity, superior rate capability and improved cyclability compared to the pristine LiFePO4 compound. Further to observe changes in the oxidation state of iron, Mössbauer spectroscopy was employed and the results were correlated with those of impedance spectroscopy, which reveal a significant increase in conductivity during charging. The presented methods provide simple yet effective routes for manufacturing efficient cathode materials at room temperature, without the need of additional oxidizing compounds to carry out the polymerization process and to rival high temperature based carbon coatings.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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