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
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Journal ArticleDOI
Water electrolysis on La(1-x)Sr(x)CoO(3-δ) perovskite electrocatalysts.
J. Tyler Mefford,Xi Rong,Artem M. Abakumov,Artem M. Abakumov,William G. Hardin,Sheng Dai,Alexie M. Kolpak,Keith P. Johnston,Keith J. Stevenson +8 more
TL;DR: This work attempts to rationalize the high activities of La1−xSrxCoO3−δ through the electronic structure and participation of lattice oxygen in the mechanism of water electrolysis as revealed through ab initio modelling.
Journal ArticleDOI
Visualization of O-O peroxo-like dimers in high-capacity layered oxides for Li-ion batteries
Eric McCalla,Artem M. Abakumov,Artem M. Abakumov,Matthieu Saubanère,Matthieu Saubanère,Dominique Foix,Dominique Foix,Erik J. Berg,Gwenaëlle Rousse,Gwenaëlle Rousse,Gwenaëlle Rousse,Marie-Liesse Doublet,Marie-Liesse Doublet,Danielle Gonbeau,Danielle Gonbeau,Petr Novák,Gustaaf Van Tendeloo,Robert Dominko,Jean-Marie Tarascon +18 more
TL;DR: The fundamental relation between the anionic redox process and the evolution of the O-O bonding in layered oxides is established, and the design of safe and long-lasting batteries requires an understanding of the physical and chemical changes that occur during redox processes.
Journal ArticleDOI
Evolution of redox couples in Li- and Mn-rich cathode materials and mitigation of voltage fade by reducing oxygen release
Enyuan Hu,Xiqian Yu,Xiqian Yu,Ruoqian Lin,Ruoqian Lin,Xuanxuan Bi,Jun Lu,Seong-Min Bak,Kyung-Wan Nam,Huolin L. Xin,Cherno Jaye,Daniel A. Fischer,K. Amine,Xiao-Qing Yang +13 more
TL;DR: In this paper, the average valence state of each type of transition metal cation is continuously reduced, which is attributed to oxygen release from the LMR material, and surface coating and modification methods are suggested to suppress the voltage fade through reducing the oxygen release.
Journal ArticleDOI
Review—Recent Advances and Remaining Challenges for Lithium Ion Battery Cathodes I. Nickel-Rich, LiNixCoyMnzO2
Florian Schipper,Evan M. Erickson,Christoph Erk,Ji-Yong Shin,Frederick Chesneau,Doron Aurbach +5 more
Journal ArticleDOI
Expanding frontiers in materials chemistry and physics with multiple anions
Hiroshi Kageyama,Katsuro Hayashi,Kazuhiko Maeda,J. Paul Attfield,Zenji Hiroi,James M. Rondinelli,Kenneth R. Poeppelmeier +6 more
TL;DR: The opportunities enabled by recent advances in synthetic approaches for design of both local and overall structure, state-of-the-art characterization techniques to distinguish unique structural and chemical states, and chemical/physical properties emerging from the synergy of multiple anions for catalysis, energy conversion, and electronic materials are discussed.
References
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Journal ArticleDOI
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