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오승모,가복현,윤성훈 한국전기화학회 2007 한국전기화학회지 Vol.10 No.4
A series of spherical porous carbons were prepared via resorcinol-formaldehyde (RF) sol-gel polymerizationhylammonium bromide), wherein the carbon sphere size wascontrolled by varying the CTAB introduction time after a pre-determined period of addition reaction (termed as pre-curing). The sphere size gradually decreases with an increase in the pre-curing time within the range of 30-150nm. The carbons possess two types of pores; one inside carbon spheres (intra-particle pores) and the other at theinterstitial sites made by carbon spheres (inter-particle pores). Of the two, the surface exposed on the former wasdominant to determine the electric double-layer capacitor (EDLC) performance of porous carbons. As the intra-particlepores were generated inside RF gel spheres by gasification, the pore diameter was similar for all these carbons,or controlling the EDLC performance. The charge-dischargevoltage profiles and complex capacitance analysis consistently illustrate that the smaller-sized RF carbons deliver abetter rate capability, which must be the direct result of facilitated ion penetration into shorter pores.
Ni-P Coated Sn Powers as Anode for Lithium Secomdary Batteries
오승모,조용남,임동민,김재정 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
Nano-sized Sn particles were coated with Ni-P layer using an electroless deposition method and theiranodic performance was tested for lithium secondary batteries. Uniform coating layers were obtained, of which thethickness was controlled by varying the Ni2+ concentration in the plating bath. It was found that the Ni-P layer playstwo important roles in improving the anodic performance of Sn powder electrode. First, it prevents the inter-particleaggregation between Sn particles during the charge/discharge process. Second, it provides an electrical conduction path-way to the Sn particles, which allows an electrode fabrication without an addition of conductive carbon. A pseudo-1) even without conductive carbon loading.