Claudia Veit

Bio: Claudia Veit is an academic researcher from Graz University of Technology. The author has contributed to research in topics: Lithium battery & Propylene carbonate. The author has an hindex of 3, co-authored 5 publications receiving 3136 citations.

Chemical Vapor Deposited Silicon/Graphite Compound Material as Negative Electrode for Lithium-Ion Batteries

Abstract: Lithium-ion batteries are interesting devices for electrochemical energy storage with respect to their energy density which is among the highest for any known secondary battery system up to more than 150 Wh/kg 1 , a promising feature for future broad applications. The material mostly used for the negative electrode anode is graphitic carbon. An important argument for the utilization of graphite as anode material is based on the relatively low volume change that occurs upon the intercalation of lithium into the host when the battery is being charged; the total volume change for the limiting composition LiC6 is only about 10%. A disadvantage of graphite, however, is the relatively low electrochemical charge capacity theoretical value 372 mAh g 1 , which is only about one-tenth of the charge capacity that could theoretically be reached with lithium metal 4235 mAh g 1 . Therefore, for many years, research has been conducted to find alternative negative electrode materials, above all in the group of lithium-metal alloys, as binary e.g., Li‐Al, Li‐Sn, Li‐Sb or ternary e.g., Li‐Cu‐Sn, Li‐Cu‐Sb ones. Among the binary and ternary metal-lithium alloys very high theoretic specific charge capacities can be found, as, e.g., 994 mAh g 1 in the case of tin. 1,2 If these values could be obtained reversibly, a notable increase of the energy density of lithium-ion batteries would be possible. Contrarily to graphite anodes, alloy anodes are compatible with propylene carbonate PC, as no exfoliation can occur, as is generally found with graphites, which would favor the development of a low-temperature battery. A general disadvantage of alloy electrodes, however, is the huge volume change which occurs upon the insertion/deinsertion of the lithium into and from the host material. In the case of both, silicon and tin it attains values of more than 200‐300% 3

Challenges in the development of advanced Li-ion batteries: a review

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.