Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 8, Pages 7825-7831Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c01216
Keywords
ring-opened poly(vinylpyrrolidone); reduced graphene oxide; conductive web; binder; Li-S batteries
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2019R1A2C1003594, NRF-2019R1A2C1003551]
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Because of its high theoretical energy density, the Li-S battery (LSB) is regarded as one of the most promising next-generation energy-storage devices. However, LSBs undergo extreme electrochemical and physical changes in S during charge cycling, which limit battery performance. Here, we design a multifunctional polymer binder based on robust conductive webs comprising ring-opened poly(vinylpyrrolidone) (PVP) connected with reduced graphene oxide (rGO). By forming an intermolecular structure in the simultaneous reduction of GO and ring-opening of PVP, the PVP-rGO web provides high affinity to Li polysulfides, mechanical robustness, and facile electron transfer, which can overcome the performance issues of LSBs. The prepared Li-S cell with the PVP-rGO web as binder presents the remarkable specific capacity of 374 mAh g(-1) at 7 C and stable cycling performance with low capacity decay per cycle over 500 cycles at both 1 and 5 C.
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