Journal ArticleDOI
Reversible anionic redox chemistry in high-capacity layered-oxide electrodes
Mariyappan Sathiya,Gwenaëlle Rousse,Kannadka Ramesha,C.P. Laisa,Hervé Vezin,Moulay Tahar Sougrati,Moulay Tahar Sougrati,Marie-Liesse Doublet,Dominique Foix,Danielle Gonbeau,Danielle Gonbeau,Wesley Walker,Annigere S. Prakash,M. Ben Hassine,M. Ben Hassine,Loic Dupont,Loic Dupont,Jean-Marie Tarascon,Jean-Marie Tarascon +18 more
TLDR
In this article, the reactivity of a class of high-capacity oxides with a single redox cation has been investigated and it has been shown that these oxides exhibit sustainable reversible capacities as high as 230 mAh/g−1 and good cycling behavior with no signs of voltage decay.Abstract:
Li-ion batteries have contributed to the commercial success of portable electronics and may soon dominate the electric transportation market provided that major scientific advances including new materials and concepts are developed. Classical positive electrodes for Li-ion technology operate mainly through an insertion-deinsertion redox process involving cationic species. However, this mechanism is insufficient to account for the high capacities exhibited by the new generation of Li-rich (Li1+xNiyCozMn(1−x−y−z)O2) layered oxides that present unusual Li reactivity. In an attempt to overcome both the inherent composition and the structural complexity of this class of oxides, we have designed structurally related Li2Ru1−ySnyO3 materials that have a single redox cation and exhibit sustainable reversible capacities as high as 230 mA h g−1. Moreover, they present good cycling behaviour with no signs of voltage decay and a small irreversible capacity. We also unambiguously show, on the basis of an arsenal of characterization techniques, that the reactivity of these high-capacity materials towards Li entails cumulative cationic (Mn+→M(n+1)+) and anionic (O2−→O22−) reversible redox processes, owing to the d-sp hybridization associated with a reductive coupling mechanism. Because Li2MO3 is a large family of compounds, this study opens the door to the exploration of a vast number of high-capacity materials.read more
Citations
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Journal ArticleDOI
Design of a p-Type Electrode for Enhancing Electronic Conduction in High-Mn, Li-Rich Oxides
TL;DR: In this paper, the authors reported the introduction of p-type conductivity in high-Mn, Li-rich oxides (HMLOs) by the addition of Cu doping to improve intrinsic electronic conduction.
Journal ArticleDOI
A reversible oxygen redox reaction in bulk-type all-solid-state batteries.
Kenji Nagao,Yuka Nagata,Atsushi Sakuda,Akitoshi Hayashi,Minako Deguchi,Chie Hotehama,Hirofumi Tsukasaki,Shigeo Mori,Yuki Orikasa,Kentaro Yamamoto,Yoshiharu Uchimoto,Masahiro Tatsumisago +11 more
TL;DR: Amorphous nature of the Li2RuO3-Li2SO4 matrix enables inclusion of active material with high conductivity and ductility for achieving favorable interfaces with charge transfer capabilities, leading to the stable operation of all-solid-state batteries.
Journal ArticleDOI
Synthesis and Electrochemical Activity of Some Na(Li)‐Rich Ruthenium Oxides with the Feasibility to Stabilize Ru 6+
Misae Otoyama,Misae Otoyama,Quentin Jacquet,Quentin Jacquet,Quentin Jacquet,Antonella Iadecola,Matthieu Saubanère,Matthieu Saubanère,Gwenaëlle Rousse,Gwenaëlle Rousse,Gwenaëlle Rousse,Jean-Marie Tarascon,Jean-Marie Tarascon,Jean-Marie Tarascon +13 more
TL;DR: In this paper, it was shown that 3 Na can be extracted from Na3RuO4 with the charge compensation mechanism enlisting first the oxidation of Ru5+ to Ru6+, leading to Na2RuO 4, and then the oxidization of oxygen during the rest of the charge.
Journal ArticleDOI
Considerable capacity increase of high-nickel lithium-rich cathode materials by effectively reducing oxygen loss and activating Mn4+/3+ redox couples via Mo doping
Limin Guo,Limin Guo,Xinghua Tan,Xinghua Tan,Shengnan Liu,Shengnan Liu,Jianxin Wu,Jianxin Wu,Juncong Ren,Tingqiao Zhao,Tingqiao Zhao,Xiaohong Kang,Hanfu Wang,Weiguo Chu,Weiguo Chu +14 more
TL;DR: In this article, high-nickel Li-rich layered oxides are doped by Mo via a facile sol-gel route to realize both high reversible capacity and minor voltage decay simultaneously.
Journal ArticleDOI
Identification and roles of nonstoichiometric oxygen in amorphous Ta2O5 thin films deposited by electron beam and sputtering processes
TL;DR: In this paper, the morphology and composition of tantalum oxide (Ta 2 O 5 ) thin films prepared by electron-beam (EB) evaporation and radio-frequency sputtering (SP) were investigated by grazing incidence X-ray diffraction (GIXRD), X-Ray reflectometry (XRR), atomic force microscopy, Fourier transformed infrared spectroscopy (FTIR), and XPS.
References
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Journal ArticleDOI
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Journal ArticleDOI
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