TY - JOUR
T1 - Functionalized double side coated separator for lithium-sulfur batteries with enhanced cycle life
AU - Kiai, Maryam Sadat
AU - Kizil, Huseyin
N1 - Publisher Copyright:
© 2018 The Electrochemical Society.
PY - 2018
Y1 - 2018
N2 - Lithium-sulfur batteries are increasingly being investigated due to their high theoretical energy density in comparison to lithium-ion batteries. However, their performance is hindered by the dissolution of polysulfides in liquid electrolytes causing the shuttle effect, which then leads to capacity fading due to loss of active material. Here we report glass fiber separators with both sides coated and doped to suppress the shuttle effect thus restrain the capacity fading and achieve long cycle life. Cathode-facing side is coated with potassium functionalized graphene nanoplates doped with Poly 1,5 diaminoanthraquinone, titanium dioxide, or cyltrimethylammonium bromide, while anode- facing side is coated with potassium functionalized graphene nanoplates (K-FGF) doped with Poly 1,5 diaminoanthraquinone (PDAAQ). Liquid graphene oxide and PVDF binder in NMP solvent are used as a binder alternatively. Electrochemical performances of the batteries with these double side coated separators are tested and compared. It is found that the battery with titanium dioxide(TiO2) doped K-FGF coated separator on the cathode-facing side exhibits high capacity retention of 1191 mAh g−1 and 1237 mAh g−1 after 200 cycles at 1 C and 0.5 C rates respectively. The cell with cyltrimethylammonium bromide (CTAB) doped K-FGF coated separator on the cathode-facing side displays capacity retention of 1189 and 1011 mAh g−1 over 200 cycles for 0.5 C and 1 C respectively. In both cases liquid graphene oxide (L-GO) is used as a binder in the cathode-facing side and PVDF binder in NMP solvent is added at the anode-facing side.
AB - Lithium-sulfur batteries are increasingly being investigated due to their high theoretical energy density in comparison to lithium-ion batteries. However, their performance is hindered by the dissolution of polysulfides in liquid electrolytes causing the shuttle effect, which then leads to capacity fading due to loss of active material. Here we report glass fiber separators with both sides coated and doped to suppress the shuttle effect thus restrain the capacity fading and achieve long cycle life. Cathode-facing side is coated with potassium functionalized graphene nanoplates doped with Poly 1,5 diaminoanthraquinone, titanium dioxide, or cyltrimethylammonium bromide, while anode- facing side is coated with potassium functionalized graphene nanoplates (K-FGF) doped with Poly 1,5 diaminoanthraquinone (PDAAQ). Liquid graphene oxide and PVDF binder in NMP solvent are used as a binder alternatively. Electrochemical performances of the batteries with these double side coated separators are tested and compared. It is found that the battery with titanium dioxide(TiO2) doped K-FGF coated separator on the cathode-facing side exhibits high capacity retention of 1191 mAh g−1 and 1237 mAh g−1 after 200 cycles at 1 C and 0.5 C rates respectively. The cell with cyltrimethylammonium bromide (CTAB) doped K-FGF coated separator on the cathode-facing side displays capacity retention of 1189 and 1011 mAh g−1 over 200 cycles for 0.5 C and 1 C respectively. In both cases liquid graphene oxide (L-GO) is used as a binder in the cathode-facing side and PVDF binder in NMP solvent is added at the anode-facing side.
UR - http://www.scopus.com/inward/record.url?scp=85067516747&partnerID=8YFLogxK
U2 - 10.1149/2.1421814jes
DO - 10.1149/2.1421814jes
M3 - Article
AN - SCOPUS:85067516747
SN - 0013-4651
VL - 165
SP - A3574-A3581
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 14
ER -