Effects of Silicon and Carbon Composition on Carbon Nanotubes in Lithium-Ion Batteries
نویسنده
چکیده
Introduction Lithium-ion (Li-ion) batteries are attractive for many applications due to their high energy density and low selfdischarge rate. To further increase the energy and power densities of Li-ion technology, significant activity to increase the capacity of the anode has been conducted. Silicon anodes have the potential to increase the current state-of-art anode (graphite) capacity by nearly an order of magnitude. However, achieving high capacity and stability for Si-based anodes has been challenging due to the large volume changes that occur during electrochemical alloying and dealloying of Li. [1] In this study, anodes consisting of vertically aligned carbon nanotubes (VACNTs) coated with nano-thick films of Si and C are considered. Prior work has previously shown the ability of this architecture to minimize degradation effects related to LixSiy volume expansion and to enhance the anode’s thermal and electrical conductivity [2]. Here we consider the effect of varying Si and C composition (e.g. thickness) on the stability of the electrochemical performance of this anode architecture.
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