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
Enhanced Oxygen Redox Reversibility and Capacity Retention of Titanium-Substituted Na4/7[□1/7Ti1/7Mn5/7]O2 in Sodium-Ion Batteries
Stephanie F. Linnell,Eun Jeong Kim,YongMan Choi,Moritz Hirsbrunner,Saki Imada,Atin Pramanik,Aida Fuente Cuesta,David Miller,E. Fusco,Bela E. Bode,John T. S. Irvine,Laurent Duda,David O. Scanlon,A. Robert Armstrong +13 more
TL;DR: Anion redox reactions offer a means of enhancing the capacity of layered sodium transition metal oxide positive electrode materials, however, oxygen redox reaction typically show limited reversibility and irreversible structural degradation as mentioned in this paper .
Journal ArticleDOI
A facile strategy to enhance the stability of Li-rich cathode: Electrochemical performance improvement and mechanism exploration
TL;DR: In this article, Li+ conductive Li2SnO3 (LSO) is selected to modify the surface of Li1.2Mn0.56Ni0.17Co0.07O2 (LMNCO) without influencing its bulk structure.
Journal ArticleDOI
Strain-Induced Stabilization of Charged State in Li-Rich Layered Transition-Metal Oxide for Lithium-Ion Batteries
Tomoya Kawaguchi,Masashi Sakaida,Masatsugu Oishi,Tetsu Ichitsubo,Katsutoshi Fukuda,Satoshi Toyoda,Eiichiro Matsubara +6 more
TL;DR: Li-rich layered oxide (LLO) is a promising cathode material for lithium-ion batteries because of its large capacity in comparison with conventional layered rock-salt structure materials as discussed by the authors.
Journal ArticleDOI
Improved electrochemical properties of solvothermally synthesized Li2FeSiO4/C nanocomposites: A comparison between solvothermal and sol-gel methods
TL;DR: Li et al. as mentioned in this paper synthesized porous Li 2 FeSiO 4 /C nanocomposites using block copolymer pluronic (P123) as both in-situ carbon source and structure directing agent.
Journal ArticleDOI
Exploring the influence of iron substitution in lithium rich layered oxides Li2Ru1−xFexO3: triggering the anionic redox reaction
Rohit Satish,Kipil Lim,Kipil Lim,Nicolas Bucher,Steffen Hartung,Vanchiappan Aravindan,Joseph Franklin,Joseph Franklin,Joseph Franklin,Jun-Sik Lee,Michael F. Toney,Srinivasan Madhavi +11 more
TL;DR: In this article, Li2RuO3 was used as the base compound, which is then compared with compounds generated by partially substituting Ru with Ti and Fe respectively, showing that Fe substitution in the sample leads to an improvement in capacity, cycle life and reduction of potential decay.
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.
Journal ArticleDOI
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set.
Georg Kresse,Jürgen Furthmüller +1 more
TL;DR: An efficient scheme for calculating the Kohn-Sham ground state of metallic systems using pseudopotentials and a plane-wave basis set is presented and the application of Pulay's DIIS method to the iterative diagonalization of large matrices will be discussed.
Journal ArticleDOI
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
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.