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
An intuitive and efficient method for cell voltage prediction of lithium and sodium-ion batteries
Matthieu Saubanère,Matthieu Saubanère,M. Ben Yahia,M. Ben Yahia,Sébastien Lebègue,Sébastien Lebègue,Marie-Liesse Doublet,Marie-Liesse Doublet +7 more
TL;DR: A new formulation of the cell voltage in terms of chemically intuitive quantities that can be rapidly and quantitatively evaluated from the alkaliated crystal structure with no need of first-principles calculations is reported.
Journal ArticleDOI
Role of the composition of lithium-rich layered oxide materials on the voltage decay
David Peralta,Jean-François Colin,Adrien Boulineau,Loïc Simonin,Frédéric Fabre,Justin Bouvet,Pierre Feydi,Mohamed Chakir,Marlène Chapuis,Sébastien Patoux +9 more
TL;DR: In this article, the authors study the origin of the potential decay of lithium-rich layered oxide during cycling of Li-ion batteries and compare the electrochemical behavior of xLi 2 MnO 3 ·(1−x)LiNi 0.5 O 2 (with x ǫ = 1, 0.27) materials synthesized using coprecipitation route.
Journal ArticleDOI
Synthesis and electrochemical characterization of Mg–Al co-doped Li-rich Mn-based cathode materials
Youwei Liang,Shiyou Li,Jing Xie,Li Yang,Li Wenbo,Chunlei Li,Ling Ai,Xiaolan Fu,Xiaoling Cui,Xuehui Shangguan +9 more
TL;DR: Li-rich layered oxide cathodes suffer from poor rate capability, decayed voltage and inferior cycling stability, and a novel synergistic strategy was proposed to improve the electrochemical performance of Li-rich Li1.2Mn0.54Ni0.13Co 0.13O2 by the co-doping of magnesium and aluminium.
Journal ArticleDOI
Critical Role of Titanium in O3-Type Layered Cathode Materials for Sodium-Ion Batteries
Taesoon Hwang,Junghyun Lee,Seung-Hyun Choi,Rye-Gyeong Oh,Duho Kim,Maenghyo Cho,Woosuk Cho,Min-Sik Park +7 more
TL;DR: It is suggested that Ti substitution effectively enhances the binding between transition metals and oxygen by increasing the oxygen electron density, which in turn lowers the energy barrier of Na+ migration, leading to a notable enhancement in the rate capability of Na[Ti 0.25Ni0.25Mn0.5O2]O2.
Journal ArticleDOI
Efficient potential-tuning strategy through p-type doping for designing cathodes with ultrahigh energy density.
Wang Zhiqiang,Wang Zhiqiang,Da Wang,Zheyi Zou,Tao Song,Dixing Ni,Zhenzhu Li,Xuecheng Shao,Wan-Jian Yin,Yanchao Wang,Wenwei Luo,Musheng Wu,Maxim Avdeev,Maxim Avdeev,Bo Xu,Siqi Shi,Chuying Ouyang,Liquan Chen +17 more
TL;DR: It is shown that Fermi level tuning by p-type doping can be an effective way of dramatically raising electrode potential, enabling them to accommodate Li+(Na+) with capacities of 290–400 mAh g−1 at potentials of 3.4–3.7 V.
References
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Journal ArticleDOI
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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
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