摘要
A gradient copolymer, poly(styrene-co-vinylbenzyl), was synthesized and used to construct a porous conductive framework on carbon fabric (Cporous@CF). Compared with the pristine CF, Cporous@CF exhibited a smaller average pore size (from greater than 10 to 1-2 μm), a greatly expanded surface area (from 2.2 to 55 m2 g-1), an improved connection between carbon fibers, and better electronic conduction. The prepared Cporous@CF was tested as a conductive host for the cathode active material in lithium-polysulfide batteries. The cell constructed with Cporous@CF had a higher capacity (>1000 mAh g-1 at 0.1-0.5C) and better rate capability compared to that constructed with pristine CF. The primary causes of the improved electrochemical performance of the Cporous@CF cell are discussed and clarified through cyclic voltammetry and the method of the galvanostatic intermittent titration technique.