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Chapter 1: Literature review 1.1. Introduction to Li-ion batteries Development of new portable devices and electronics has been regularly increasing during the last few years. With the competitive market of smartphones, tablets, PCs and electrical vehicles (EV), this trend is even more accelerated currently. The market of EV is actually a strong motivation to work on the development of ‘better’ batteries with enhanced cycle life, increased energy density and power, and of lower cost. This new era of communication and mobility would not be possible without efficient solutions for energy storage. Among a wide range of energy storage systems, rechargeable secondary batteries, especially lithium-ion (Li-ion) cells, are currently the dominant technology for powering portable devices, mostly due to their capability of delivering electrical energy with high power and energy densities (Figure 1-1). Figure 1-1. Comparison of different rechargeable battery technologies, in terms of gravimetric and volumetric energy densities. A classical Li-ion cell system4,11 consists of both positive and negative electrodes, which are separated by an ionically conducting electrolyte. Transition metal oxides, or more generally the oxide compounds, are often employed as active materials for the positive electrode, and graphite for the negative one, where intercalation reactions of Li+ ions occur during discharge and charge respectively. The electrolyte is usually imbibed in a porous separator, which acts as a physical barrier avoiding the contact between the electrodes, while allowing for Li+ ions Chapter 1: Literature review 13PDF Image | Accumulateur Lithium Soufre
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