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
The phase structure and electrochemical performance of xLi2MnO3·(1 − x)LiNi1/3Co1/3Mn1/3O2 during the synthesis and charge–discharge process
TL;DR: In this paper, the effects of reaction temperature and x value on the phase structure and electrochemistry were systemically studied by X-ray diffraction, galvanostatical charge/discharge and electrochemical impedance spectroscopy (EIS).
Journal ArticleDOI
High-discharge-voltage lithium-rich layered-oxide cathode materials based on low oxygen vacancy.
TL;DR: This work prepares the lithium-rich layered oxide Li1.13O2 with a 3.65 V average-discharge voltage by using lithiated homologous spinel Li0.4Mn0.54Ni0.13Co0.12O1.6 in an O2 atmosphere and discusses how oxygen vacancies affect the discharge voltage.
DissertationDOI
New perception of electrode-electrolyte interfaces in Li-ion batteries enabled by XPEEM spectromicroscopy
Journal ArticleDOI
Suppressing Surface Lattice Oxygen Evolution by Fluorinated Graphene-Scaffolded Lithium-Rich Manganese-Based Cathode for Enhanced Stability
Tao Li,Xinyao Xia,Jie Liu,Zhongxin Liu,Shi-Xiang Hu,Lifang Zhang,Yiwei Zheng,Zhenkang Wang,Hongli Chen,Mingji Peng,Tao Qian,Chenglin Yan +11 more
Journal ArticleDOI
Inhibiting Mn Migration by Sb-Pinning Transition Metal Layers in Lithium-Rich Cathode Material for Stable High-Capacity Properties.
Fei Cao,Weihao Zeng,Jiawei Zhu,Jin-Kun Xiao,Zilan Li,Ming Li,Rui Qin,Tingting Wang,Junxin Chen,Xiaoli Yi,Jiexi Wang,Shi-Jia Mu +11 more
TL;DR: In this article , non-TM antimony (Sb) is pinned to the TM layer of LNMO by a facile sol-gel method, which can impressively adjust the Mn-O interaction between anions and cations, beneficial to decrease the energy level of Mn 3d and O 2p orbitals and expand their band gap.
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
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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.