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Christian M. Julien

Bio: Christian M. Julien is an academic researcher from University of Paris. The author has contributed to research in topics: Lithium & Raman spectroscopy. The author has an hindex of 63, co-authored 332 publications receiving 12387 citations. Previous affiliations of Christian M. Julien include Pierre-and-Marie-Curie University & Polish Academy of Sciences.


Papers
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Journal ArticleDOI
TL;DR: Structural trends are deduced from the comparison of the vibrational spectra of the MDO phases investigated: birnessite, bixbyite, coronadite, groutite, hausmannite, hollandite, manganosite, pyrolusite, ramsdellite, romanechite, spinel, and todorokite.

789 citations

Journal ArticleDOI
TL;DR: In this article, the structural features of layered manganese dioxides of the Birnessite family were studied using Raman scattering spectroscopy, which is capable of analysing directly the near-neighbour environment of oxygen coordination around menganese and lithium cations.

633 citations

Journal ArticleDOI
25 Mar 2014
TL;DR: In this paper, a comparative study of the physical and electrochemical properties of positive electrodes used in lithium-ion batteries is presented, with emphasis on synthesis difficulties, electrochemical stability, faradaic performance and security issues.
Abstract: After an introduction to lithium insertion compounds and the principles of Li-ion cells, we present a comparative study of the physical and electrochemical properties of positive electrodes used in lithium-ion batteries (LIBs). Electrode materials include three different classes of lattices according to the dimensionality of the Li+ ion motion in them: olivine, layered transition-metal oxides and spinel frameworks. Their advantages and disadvantages are compared with emphasis on synthesis difficulties, electrochemical stability, faradaic performance and security issues

359 citations

Journal ArticleDOI
TL;DR: Li 1+ x (Ni 1/3 Mn1/3 Co 1/ 3 Co O 2 ) 1− x O 2 layered materials were synthesized by the co-precipitation method with different Li/M molar ratios as discussed by the authors.

323 citations

Journal ArticleDOI
TL;DR: In this article, a Li-ion battery with nanoparticles of LiFePO4 (LFP) and Li4Ti5O12 (LTO) for the positive and negative electrodes is presented.

302 citations


Cited by
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Journal ArticleDOI
TL;DR: New strategies are needed for batteries that go beyond powering hand-held devices, such as using electrode hosts with two-electron redox centers; replacing the cathode hosts by materials that undergo displacement reactions; and developing a Li(+) solid electrolyte separator membrane that allows an organic and aqueous liquid electrolyte on the anode and cathode sides, respectively.
Abstract: Each cell of a battery stores electrical energy as chemical energy in two electrodes, a reductant (anode) and an oxidant (cathode), separated by an electrolyte that transfers the ionic component of the chemical reaction inside the cell and forces the electronic component outside the battery. The output on discharge is an external electronic current I at a voltage V for a time Δt. The chemical reaction of a rechargeable battery must be reversible on the application of a charging I and V. Critical parameters of a rechargeable battery are safety, density of energy that can be stored at a specific power input and retrieved at a specific power output, cycle and shelf life, storage efficiency, and cost of fabrication. Conventional ambient-temperature rechargeable batteries have solid electrodes and a liquid electrolyte. The positive electrode (cathode) consists of a host framework into which the mobile (working) cation is inserted reversibly over a finite solid–solution range. The solid–solution range, which is...

6,950 citations

Journal ArticleDOI
TL;DR: Li-ion battery technology has become very important in recent years as these batteries show great promise as power sources that can lead us to the electric vehicle (EV) revolution as mentioned in this paper.
Abstract: Li-ion battery technology has become very important in recent years as these batteries show great promise as power sources that can lead us to the electric vehicle (EV) revolution. The development of new materials for Li-ion batteries is the focus of research in prominent groups in the field of materials science throughout the world. Li-ion batteries can be considered to be the most impressive success story of modern electrochemistry in the last two decades. They power most of today's portable devices, and seem to overcome the psychological barriers against the use of such high energy density devices on a larger scale for more demanding applications, such as EV. Since this field is advancing rapidly and attracting an increasing number of researchers, it is important to provide current and timely updates of this constantly changing technology. In this review, we describe the key aspects of Li-ion batteries: the basic science behind their operation, the most relevant components, anodes, cathodes, electrolyte solutions, as well as important future directions for R&D of advanced Li-ion batteries for demanding use, such as EV and load-leveling applications.

5,531 citations

Journal ArticleDOI
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.

5,057 citations