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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Density functional theory guidance on rare earth doping—inhibition of lattice oxygen evolution in lithium-rich layered manganese oxide materials
Xiao-Xiao Huang,Guangwu Wen +1 more
TL;DR: In this paper , density functional theory is used to calculate the formation energies and doping sites of 13 rare earth-doped lithium-rich layered oxide (LLMO) materials, and the theoretical screening is verified by synthesizing Li1.2Ni0.133Co0.533RE0.123Mn0.01O2 (RE= La, Ce, Nd, Eu, Tm, Yb and Lu) cathode materials.
Journal ArticleDOI
Lightest Metal Leads to Big Change: Lithium‐Mediated Metal Oxides for Oxygen Evolution Reaction
Siqi Jiang,Hongli Suo,Xiao Hu Zheng,Teng Zhang,Yaojie Lei,Yunxiao Wang,Weihong Lai,Guoxiu Wang +7 more
TL;DR: In this paper , the authors provide the concepts of general OER pathways and key features of dual metal oxides for the OER, and the chemistry underlying lithium metal oxide catalysts is unveiled.
Journal ArticleDOI
Surface homogenizing heterostructure coatings induced by Ti3C2Tx MXene for enhanced cycle performance of lithium‐rich cathode materials
Journal ArticleDOI
Intrinsic enhancement of the rate capability and suppression of the phase transition via p-type doping in Fe-Mn based P2-type cathodes used for sodium ion batteries.
Taesoon Hwang,Jin Myoung Lim,Jin Myoung Lim,Rye-Gyeong Oh,Woosuk Cho,Maenghyo Cho,Kyeongjae Cho +6 more
TL;DR: In this article, a Cu-doped Fe-Mn-based P2-type Na0.5O2 cathode was designed based on the calculations of the electronic structure and then examined experimentally.
Journal ArticleDOI
Exploring the Possible Anionic Redox Mechanism in Li-Rich Transition-Metal Carbodiimides
TL;DR: In this paper, the anionic redox chemistry in Li-rich transition-metal oxides (Li-rich TMOs) was revealed, in which oxygen anions exchange electrons upon lithiation/delithiation in rechargeable batches.
References
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Journal ArticleDOI
Generalized Gradient Approximation Made Simple
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
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Journal ArticleDOI
Issues and challenges facing rechargeable lithium batteries
TL;DR: A brief historical review of the development of lithium-based rechargeable batteries is presented, ongoing research strategies are highlighted, and the challenges that remain regarding the synthesis, characterization, electrochemical performance and safety of these systems are discussed.
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.