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
Analysis of Peroxide Formation during Charge and Discharge in Co-doped Li2O Cathode of Lithium Ion Battery by Raman Spectroscopy
Yuta Shimada,Mitsuhiro Hibino,Yoshiyuki Ogasawara,Kazuya Yamaguchi,Tetsuichi Kudo,Okuoka Shinichi,Hironobu Ono,Koji Yonehara,Yasutaka Sumida,Noritaka Mizuno +9 more
TL;DR: In this article, the authors performed Raman spectroscopy of Co-doped Li2O (CDL), a cathode material for lithium-ion batteries, and the spectra showed a new peak at 790 cm−1, assignable to pero...
Journal ArticleDOI
MnO2 nanowires as precursor synthesis of lithium-rich cathode material with enhanced electrochemical performances
TL;DR: In this paper, Li1.2Mn0.54Ni0.13Co 0.13O2 for lithium-ion battery has been successfully synthesized through combination of co-precipitation and α-MnO2 nanowires as precursor.
Journal ArticleDOI
Extending nonhysteretic oxygen capacity in P2-type Ni-Mn binary Na oxides
TL;DR: In this paper , the authors compared P2-type Ni-Mn binary oxide, Na2/3[Mn3/4Ni1/4]O2 (NMNO) and a V-doped Na 2/3 [Mn 3/4 Ni 1/4]-O 2 (V-NMNO), based on a combined study of experiments and first principles calculations.
Journal ArticleDOI
P2–Na2/3Mg1/4Mn7/12Co1/6O2 cathode material based on oxygen redox activity with improved first-cycle voltage hysteresis
Nuria Tapia-Ruiz,Nuria Tapia-Ruiz,Cindy Soares,James W. Somerville,Robert A. House,Juliette Billaud,Matthew R. Roberts,Peter G. Bruce +7 more
TL;DR: In this paper, a new P2-type compound, Na2/3Mg1/4Mn7/12Co1/6O2 (P2-NMMC), was reported, which exhibits reversible specific capacities as high as 173 mAh g−1 and an improvement of the first cycle voltage hysteresis over P2NMM.
Journal ArticleDOI
Ru doping effect on the structural, electronic, transport, optical and dye degradation properties of layered Li2MnO3
Brajendra Singh,Priyanka Singh +1 more
TL;DR: In this article, Ru doped Li2MnO3 compositions show a change in structure, a large decrease in impedance, and the ability to degrade methyl orange and methylene blue solution (pH-6) in quick time in presence of tungsten (W) bulb and sun light.
References
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Journal ArticleDOI
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TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
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Journal ArticleDOI
Issues and challenges facing rechargeable lithium batteries
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Journal ArticleDOI
Building better batteries
TL;DR: Researchers must find a sustainable way of providing the power their modern lifestyles demand to ensure the continued existence of clean energy sources.