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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Simple Water Treatment Strategy To Optimize the Li2MnO3 Activation of Lithium-Rich Cathode Materials
TL;DR: Li-rich layered oxides, despite their superhigh capacity, still suffer from oxygen release and structural transformation during the first charge process, causing low Coulomb efficiency and continuo...
Journal ArticleDOI
Surface decoration accelerates the hydrogen evolution kinetics of a perovskite oxide in alkaline solution
Chun Hu,Jinhua Hong,Jian Huang,Wei Chen,Carlo U. Segre,Kazu Suenaga,Wei Zhao,Fuqiang Huang,Jiacheng Wang +8 more
TL;DR: In this article, a composite oxide-type electrocatalyst was proposed for the cathodic hydrogen evolution reaction (HER), which enables fast water dissociation with excellent HER activity in alkaline solution.
Journal ArticleDOI
Li/Fe substitution in Li-rich Ni, Co, Mn oxides for enhanced electrochemical performance as cathode materials
Juliette Billaud,Denis Sheptyakov,Sébastien Sallard,Sébastien Sallard,Daniela Leanza,Michael Talianker,Judith Grinblat,Hadar Sclar,Doron Aurbach,Petr Novák,Claire Villevieille +10 more
TL;DR: Li-rich nickel cobalt manganese (NCM) oxides are among the most promising cathode materials for lithium-ion batteries owing to their high specific charges and operating voltages as mentioned in this paper.
Journal ArticleDOI
The determining factor for interstitial oxygen formation in Ruddlesden–Popper type La2NiO4-based oxides
TL;DR: It is proposed that modulating the electronic structure is the key to control the capability of interstitial oxygen formation in La2NiO4-based oxides by providing/accepting electronic charge carriers.
Journal ArticleDOI
Enabling Anionic Redox Stability of P2‐Na <sub>5/6</sub> Li <sub>1/4</sub> Mn <sub>3/4</sub> O <sub>2</sub> by Mg Substitution
Caroline Thomas,Brendan Monahan +1 more
TL;DR: In this article , a stable anionic redox is achieved through substituting Na ions by Mg ions in P2-type Na0.83 Li0.25 Mn0.75 O2 .
References
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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
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.