Facile synthesis of yolk–shell structured Si–C nanocomposites as anodes for lithium-ion batteries

Abstract

Yolk-shell structured Si-C nanocomposites are easily synthesized by using a new method based on alkaline etching technology, and exhibit high specific capacity, good cycling stability and rate performance as anodes for lithium-ion batteries.

Scalable synthesis of highly dispersed silicon nanospheres by RF thermal plasma and their use as anode materials for high-performance Li-ion batteries

“…2,[21][22] However, the practical application of silicon as anode material is seriously hindered by its low intrinsic electrical conductivity and the huge volume changes (>400%) during lithium insertion/extraction process, which cause the silicon particles dramatically pulverized and eventually lead to the capacity rapidly fading. [23][24][25][26] To alleviate the volume changes and improve the overall electrochemical performance, various Si-based materials with different morphologies, structures and buffer matrixes, such as nanoparticles 7,22,27 (0D), nanowires 19,[28][29] , nanotubes 30 (1D), thin film 31 (2D) and Si/C nanocomposites [32][33][34] have been prepared. Among them, Si/C composites are regarded as effective structures to overcome the above drawbacks, as they could increase the electronic conductivity and alleviate the volume change at the same time.…”

Employing MXene as a matrix for loading amorphous Si generated upon lithiation towards enhanced lithium-ion storage

“…Significant progresses have been made to addressing the issues mentioned above. For instance, Si materials are designed with nanostructures [9,10] , porous structures [11] , or nanocomposites [12] , Si electrodes are designed via combining nano/micro particles or with 3D microchannels [13] , addition of electrolyte additives, and utilizing 2D materials constructs an electrode structure [14,15] . Facile ion transport, superior electrical conductivity, and sustained structural integrity were achieved to some extent [16] .…”

Silica Wastes to High-Performance Lithium Storage Materials: A Rational Designed Al2 O3 Coating Assisted Magnesiothermic Process

“…With the built‐in void space, Si nanostructures are allowed to expand and contract without breaking the integrity of electrodes. Furthermore, the engineered carbon shell can provide the essential transport channels for electrons and Li + from/to the inner silicon . The first example of Si/C yolk–shell nanocomposites was prepared with Si nanoparticles (NPs) as core and SiO 2 as sacrificial layer, and then followed by carbonization polydopamine layer to form a carbon coating.…”