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
Retardation of Structure Densification by Increasing Covalency in Li-Rich Layered Oxide Positive Electrodes for Li-Ion Batteries
Anatoli Morozov,Ivan A. Moiseev,Aleksandra A. Savina,A.O. Boev,Dmitry A. Aksyonov,Leiting Zhang,Polina Morozova,Victoria A. Nikitina,E. M. Pazhetnov,Erik J. Berg,Stanislav S. Fedotov,Jean-Marie Tarascon,Evgeny V. Antipov,Artem M. Abakumov +13 more
TL;DR: In this paper , the role of the ionocovalency of transition metal (TM)-oxygen (O) chemical bonding plays in the reversibility of the oxygen redox as well as on both local crystal and electronic structure transformations.
Journal ArticleDOI
Regulating anionic redox activity of lithium-rich layered oxides via LiNbO3 integrated modification
TL;DR: LiNbO3 integrated strategy including LiNiO3 coating, spinel heterostructure and Nb5+ doping has been proposed for stabilizing lattice oxygen and improving structural stability as discussed by the authors .
Journal ArticleDOI
Fundamental understanding of high-capacity lithium-excess cathodes with disordered rock salt structure
Hao Lin,Hao Lin,Beatriz Moreno,Kamil Kucuk,Sensen Zhang,Sensen Zhang,Shankar Aryal,Shankar Aryal,Zheng Li,Carlo U. Segre,Carlo U. Segre,Jassiel R. Rodriguez,Dhanya Puthusseri,Lirong Cai,Xuechen Jiao,Vilas G. Pol +15 more
TL;DR: In this article, a high capacity cation-disordered positive electrode-Li1.2Ni0.4Nb 0.4O2 was selected as a model compound to study intrinsic reaction mechanism, including charge compensation mechanism, kinetics, thermal stability, and structural evolution.
Journal ArticleDOI
Tuning Bulk O2 and Nonbonding Oxygen State for Reversible Anionic Redox Chemistry in P2-Layered Cathodes.
Zhenrui Li,Weijin Kong,Yang Yu,Jicheng Zhang,Deniz P. Wong,Zijian Xu,Zhenhua Chen,Christian Schulz,M. Bartkowiak,Xiangfeng Liu +9 more
TL;DR: In this paper , the authors proposed a synergy mechanism of Li2TiO3 coating and Li/Ti co-doping on the two O-redox modes to tune bulk O2 and nonbonding oxygen state for reversible oxygen redox chemistry in P2-Na0.67Mn0.5Fe0.
Journal ArticleDOI
Influence of the composition on the electrochemical properties of cathode materials xLi2MnO3•(1–x)LiMn1/3Ni1/3Co1/3O2 for lithium-ion batteries
L. S. Pechen,E. V. Makhonina,A. M. Rumyantsev,A. M. Rumyantsev,Yu. M. Koshtyal,Yu. M. Koshtyal,Vladimir Volkov,Alexander S. Goloveshkin,Vladislav S. Pervov,Igor L. Eremenko +9 more
TL;DR: In this paper, the influence of the oxide phase composition on their electrochemical performance as cathode materials was studied in lithium half-cells, and the effects of the synthetic approach and synthesis conditions on the morphology and electrochemical characteristics of the materials obtained were considered.
References
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Journal ArticleDOI
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Journal ArticleDOI
Building better batteries
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