| 초록 |
Polymeric binder for Li-S battery was developed by blending carboxylated nitrile butadiene rubber(XNBR) and poly(vinyl pyrrolidone)(PVP). During charge-discharge process, Li-polysulfide dissolves from sulfur cathode, and it also suffers huge volume fluctuation that accelerates capacity fading. To solve the problems, a new type of polymeric binder was developed based on PVP and XNBR. PVP is well known binder material for sulfur electrode as its abundance of carbonyl group, which can trap polysulfide and mitigate shuttle effect. XNBR was incorporated for the elasticity which can stabilize volume variation, and formed mechanically robust network in PVP matrix. Acrylonitrile group of XNBR enhanced adhesiveness to current collectors. Various compositions of XNBR/PVP binder were prepared and optimized at the ratio of XNBR and PVP (3:7). The prepared rubbery binder showed higher capacity and showed potential for further application in Li-S battery. |
