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
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Journal ArticleDOI
Surface Heterostructure Induced by PrPO4 Modification in Li1.2[Mn0.54Ni0.13Co0.13]O2 Cathode Material for High-Performance Lithium-Ion Batteries with Mitigating Voltage Decay
TL;DR: The elaborate surface heterostructure on a lithium-rich cathode material can effectively curb the undesired side reactions with the electrolyte and may also extend to other layered oxides to improve their cycling stability at high voltage.
Journal ArticleDOI
Material design of high-capacity Li-rich layered-oxide electrodes: Li2MnO3 and beyond
Soo Kim,Muratahan Aykol,Vinay Hegde,Zhi Lu,Scott Kirklin,Jason R. Croy,Michael M. Thackeray,Chris Wolverton +7 more
TL;DR: In this paper, the authors catalog the Li2MO3 compounds as active cathodes or inactive stabilizing agents using high-throughput density functional theory (HT-DFT) and predict a number of new Li2MIO3-Li2MIIO3 active/inactive electrode pairs, in which MI and MII are transition-or post-transition metal ions, that can be tested experimentally for high energy-density LIBs.
Journal ArticleDOI
Spectroscopic Signature of Oxidized Oxygen States in Peroxides.
Zengqing Zhuo,Zengqing Zhuo,Chaitanya Das Pemmaraju,John Vinson,Chunjing Jia,Brian Moritz,Ilkyu Lee,Shawn Sallies,Qinghao Li,Jinpeng Wu,Kehua Dai,Yi-De Chuang,Zahid Hussain,Feng Pan,Thomas P. Devereaux,Wanli Yang +15 more
TL;DR: Different mRIXS features of the oxygen states in Li2O, Li2CO3, and especially,Li2O2 are reported, which are successfully reproduced and interpreted theoretically and provide critical hints for both detecting and understanding the oxygen redox reactions in transition-metal oxide based battery materials.
Journal ArticleDOI
Multi-Electron Reactions Enabled by Anion-Based Redox Chemistry for High-Energy Multivalent Rechargeable Batteries.
Zhenyou Li,B. P. Vinayan,Piotr Jankowski,Christian Njel,Ananyo Roy,Tejs Vegge,Julia Maibach,Juan Maria García Lastra,Maximilian Fichtner,Zhirong Zhao-Karger +9 more
TL;DR: Mechanical studies reveal a unique redox activity mainly at anionic sulfides moieties and fast Mg2+ ion diffusion kinetics enabled by the soft structure and flexible electron configuration of VS4, verified in both rechargeable Mg batteries and rechargeable Ca batteries.
Journal ArticleDOI
Ordered Mesoporous Cobalt Containing Perovskite as a High-Performance Heterogeneous Catalyst in Activation of Peroxymonosulfate.
Xinsheng Luo,Langming Bai,Jiajian Xing,Xuewu Zhu,Daliang Xu,Binghan Xie,Zhendong Gan,Guibai Li,Heng Liang +8 more
TL;DR: An ordered mesoporous perovskite, La2CoMnO6-δ (MLCMO), was synthesized for the first time using a facile method of evaporation-induced self-assembly and exhibited superior catalytic performance in peroxymonosulfate (PMS) activation for atrazine (ATZ) degradation.
References
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Journal ArticleDOI
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