Joseph W. Stiles, Brianna Hoff, Maria C. Curria, Scott B. Lee, Fang Yuan, Guangming Cheng, Fatmagül Katmer, Grigorii Skorupskii, Jiaze Xie, Josh Leeman, Nan Yao, Claire E. White, Craig B. Arnold, Leslie M. Schoop
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引用次数: 0
Abstract
HxCrS2−δ is produced by the proton exchange of NaCrS2 and features alternating layers of crystalline and amorphous lamella. It exhibits superior performance as a Na-ion battery electrode compared with its parent compound with faster Na+ diffusion, higher capacity, and better cyclability. This work explores the nature of the unique biphasic structure of HxCrS2−δ using both powder and single-crystal X-ray diffraction, as well as electron microscopy. Additionally, ex situ characterizations using X-ray absorption spectroscopy, X-ray total scattering, and magnetometry are employed to study the mechanism by which this superiority arises. These reveal that migration of Cr does not impede battery performance and may, in fact, be crucial to the observed performance improvements. These studies show that Cr redox is not only possible but abundant in HxCrS2−δ while accessing it in NaCrS2 at lower voltages results in irreversible structural transitions that limit cycling stability. Additionally, we highlight the potential of biphasic structures such as HxCrS2−δ to enable high performance in energy storage electrodes.
期刊介绍:
The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.