| 초록 |
A novel polymer-coated sulfur electrode to block the soluble polysulfide via surface-induced crosslinking polymerization was prepared. The polymer coated sulfur composite electrode retained specific capacity beyond 665 mAh g-1 at high rates of 2 C after 100 cycles with an excellent coulombic efficiency of 100%. We also developed a novel physically-crosslinked polymer binder induced by reversible acid-base interaction for high performance silicon-anodes. Unlike the common chemical crosslinking, which causes a gradual and non-reversible fracturing of the crosslinked network, a physically crosslinked binder based on PAA-PBI (poly(benzimidazole)) efficiently holds the Si particles even after the large volume changes due to its ability to reversibly reconstruct ionic bonds. The PBI-containing binder, PAA-PBI-2, exhibited large capacity (1376.7 mAh g-1), high Coulombic efficiency (99.1%) and excellent cyclability (751.0 mAh g-1 after 100 cycles). |
