Hollow Silica Spheres Embedded in a Porous Carbon Matrix and Its Superior Performance as the Anode for Lithium‐Ion Batteries

Abstract

Silica (SiO2) is regarded as one of the most promising anode materials for lithium‐ion batteries due to the high theoretical specific capacity and extremely low cost. However, the low intrinsic electrical conductivity and the big volume change during charge/discharge cycles result in a poor electrochemical performance. Here, hollow silica spheres embedded in porous carbon (HSS–C) composites are synthesized and investigated as an anode material for lithium‐ion batteries. The HSS–C composites demonstrate a high specific capacity of about 910 mA h g−1 at a rate of 200 mA g−1 after 150 cycles and exhibit good rate capability. The porous carbon with a large surface area and void space filled both inside and outside of the hollow silica spheres acts as an excellent conductive layer to enhance the overall conductivity of the electrode, shortens the diffusion path length for the transport of lithium ions, and also buffers the volume change accompanied with lithium‐ion insertion/extraction processes.

Systematic Investigation of Prelithiated SiO2 Particles for High-Performance Anodes in Lithium-Ion Battery

“…However, bulk-SiO 2 is generally conformed to be lithium inactive due to instinctive insulation [8][9][10][11]. Therefore, considerable efforts have been devoted to various nanostructures, such as hollow nano-spheres [12], nano-films [8,11], nano-cubes [13], nanotubes [14] and nano-belts [15].…”

Enhanced Electrochemical Performance of Electrospun SiO2 Nanofibers as Binder-free Anode

“…3 In recent times, SiO 2 with various nanostructures such as thin film, hollow nanocubes, porous tree, hollow nanotube, and nanobelts have been reported with improved electrochemical performance in terms of high capacity and good cyclability. [4][5][6][7][8][9] Particularly, SiO 2 in the form of nanofibers are attractive for improving its charge transport stability which is expected to deliver superior performance. Furthermore, the nanofiberous non-woven matt has an advantage of high mobility of Li ions due to its large surface area and also provides free space to accommodate volumetric expansion during lithiation and thereby enhancing the performance.…”

Study on the failure behavior of the current interrupt device of lithium‐ion battery considering the effect of creep

“…Li-ion power batteries are widely used in electric vehicles because of their high specific energy density and long life. [1][2][3][4][5] With the progress of technology, the energy density of power battery has been greatly increased, which also brings unprecedented challenges to the structural safety of battery. 6,7 The failure of lithium-ion power batteries can be attributed to two aspects: internal pressure or external pressure.…”