Journal ArticleDOI
Oxidation state of cross-over manganese species on the graphite electrode of lithium-ion cells
Sanketh R. Gowda,Kevin G. Gallagher,Jason R. Croy,Martin Bettge,Michael M. Thackeray,Mahalingam Balasubramanian +5 more
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TLDR
The deposition of Mn(0) on the graphite negative electrode acts as a starting point to understand the consequent electrochemical behavior of these electrodes; possible reasons for the degradation of cell performance are proposed and discussed.Abstract:
It is well known that Li-ion cells containing manganese oxide-based positive electrodes and graphite-based negative electrodes suffer accelerated capacity fade, which has been attributed to the deposition of dissolved manganese on the graphite electrodes during electrochemical cell cycling. However, the reasons for the accelerated capacity fade are still unclear. This stems, in part, from conflicting reports of the oxidation state of the manganese species in the negative electrode. In this communication, the oxidation state of manganese deposited on graphite electrodes has been probed by X-ray absorption near edge spectroscopy (XANES). The XANES features confirm, unequivocally, the presence of fully reduced manganese (Mn0) on the surface of graphite particles. The deposition of Mn0 on the graphite negative electrode acts as a starting point to understand the consequent electrochemical behavior of these electrodes; possible reasons for the degradation of cell performance are proposed and discussed.read more
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Li-ion battery materials: present and future
TL;DR: In this article, a review of the key technological developments and scientific challenges for a broad range of Li-ion battery electrodes is presented, and the potential/capacity plots are used to compare many families of suitable materials.
Journal ArticleDOI
High-voltage positive electrode materials for lithium-ion batteries
TL;DR: This review gives an account of the various emerging high-voltage positive electrode materials that have the potential to satisfy the requirements of lithium-ion batteries either in the short or long term, including nickel-rich layered oxides, lithium- rich layeredOxides, high- voltage spinel oxide compounds, and high- voltage polyanionic compounds.
Journal ArticleDOI
A Review of Scientific Instruments
TL;DR: Lang as discussed by the authors reviewed Lang's work in the Journal of Scientific Instruments (JSI) and Supplement No 1, 1951 Pp xvi + 388 + iii + 80 (London: Institute of Physics, 1951).
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Dissolution, migration, and deposition of transition metal ions in Li-ion batteries exemplified by Mn-based cathodes – a critical review
TL;DR: In this paper, a review article mainly focuses on research activities with regard to the dissolution-migration-deposition (DMD) process in transition metal-based cathode materials.
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The success story of graphite as a lithium-ion anode material – fundamentals, remaining challenges, and recent developments including silicon (oxide) composites
TL;DR: In this article, the authors provide an overview on the relevant fundamental aspects for the de-/lithiation mechanism, the already overcome and remaining challenges (including, for instance, the potential fast charging and the recycling), as well as recent progress in the field such as the tradeoff between relatively cheaper natural graphite and comparably purer synthetic graphite, and the introduction of relevant amounts of silicon (oxide) to boost the energy and power density.
References
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Journal ArticleDOI
Li2MnO3-stabilized LiMO2 (M = Mn, Ni, Co) electrodes for lithium-ion batteries
Michael M. Thackeray,Sun-Ho Kang,Christopher S. Johnson,John T. Vaughey,Roy Benedek,Stephen A. Hackney +5 more
TL;DR: In this paper, a strategy used to design high capacity (>200 mAh g−1), Li2MnO3-stabilized LiMO2 (M = Mn, Ni, Co) electrodes for lithium-ion batteries is discussed.
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Lithium insertion into manganese spinels
TL;DR: In this article, Li has been inserted chemically and electrochemically into Mn3O4 and Li[Mn2]O4 at room temperature from X-ray diffraction.
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Improved capacity retention in rechargeable 4 V lithium/lithium- manganese oxide (spinel) cells
TL;DR: In this article, the authors improved the rechargeable capacity of 4 V LixMn2O4 spinel cathodes by modifying the composition of the spinel electrode, achieving a capacity in excess of 100 mAh/g in flooded-electrolyte lithium cells.
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Layered Lithium Insertion Material of LiCo1/3Ni1/3Mn1/3O2 for Lithium-Ion Batteries
TL;DR: In this paper, LiCo1/3Ni 1/3Mn 1 /3O2 was prepared by a solid state reaction at 1000 °C in air and examined in nonaqueous lithium cells.
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Layered Cathode Materials Li [ Ni x Li ( 1 / 3 − 2x / 3 ) Mn ( 2 / 3 − x / 3 ) ] O 2 for Lithium-Ion Batteries
TL;DR: The structure, synthesis, and electrochemical behavior of layered for 5/12, and 1/2 are reported for the first time in this article, where the authors derive from or by substitution of and by while maintaining all the remaining Mn atoms in the 4+ oxidation state.