Nanostructured silicon has garnered considerable attention as a promising lithium-ion battery anode material that can mitigate volume expansion-induced pulverization during electrochemical lithiation-delithiation reaction. However, the advantageous effect of the nanostructured silicon materials is often shadowed by electrochemically-vigorous liquid electrolytes. Herein, a variety of silicon particles featuring well-defined nanostructures were synthesized and then combined with chemically-crosslinked, triacrylate-based gel polymer electrolytes (GPEs), with an aim to pursue unprecedented synergistic coupling and its versatile applicability for high-performance silicon anodes. The silicon anode combined with the GPE showed a specific capacity of over 2000 mA h g-1 after 100 cycles, excellent discharge rate capability (capacity of 80% at 5.0C with respect to 0.2C), and volume change of 53% relative to a control system (silicon anode/liquid electrolyte). Excellent flexibility of the GPE with reliable electrochemical properties is believed to play a viable role as a mechanical cushion that can alleviate the stress and strain of silicon materials inevitably generated during repeated charge/discharge cycling. The nanostructured silicon/GPE-based coupling strategy presented herein opens a new way to enable a significant improvement in the electrochemical performance and long-term durability of high-capacity silicon anodes.
Bibliographical noteFunding Information:
This work was supported by the IT R&D program of MOTIE/ KEIT (10046309) and also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning (2015R1A2A1A01003474).
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)