Journal
SMALL
Volume 16, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202002789
Keywords
catalyst; FeOOH nanorods; multifunctional interlayers; polysulfide shuttle; strong chemisorption
Categories
Funding
- Natural Science Foundation of Guangdong Province [2018A030313739]
- National Natural Science Foundation of China Program [51602111]
- Cultivation project of National Engineering Technology Center [2017B090903008]
- Xijiang RD Team
- Guangdong Provincial Grant [2017A050506009]
- Special Fund Project of Science and Technology Application in Guangdong [2017B020240002]
- 111 project
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The commercial course of Li-S batteries (LSBs) is impeded by several severe problems, such as low electrical conductivity of S, Li2S2, and Li2S, considerable volume variation up to 80% during multiphase transformation and severe intermediation lithium polysulfides (LiPSs) shuttle effect. To solve above problems, conductive FeOOH interlayer is designed as an effective trapper and catalyst to accelerate the conversion of LiPSs in LSBs. FeOOH nanorod is effectively affinitive to S that Fe atoms act as Lewis acid sites to capture LiPSs via strong chemical anchoring capability and dispersion interaction. The excellent electrocatalytic effect enables that reduced charging potential barrier and enhanced electron/ion transport is realized on the FeOOH interlayer to promote LiPSs conversion. Significantly, Li2S oxidation process is improved on the FeOOH interlayer determined as a combination of reduced Li2S decomposition energy barrier and enhanced Li-ion transport. Therefore, the multifunctional FeOOH interlayer with conductive and catalytic features show strong chemisorption with LiPSs and accelerated LiPSs redox kinetics. As a result, LSBs with FeOOH interlayer displays high discharge capacity of 1449 mAh g(-1)at 0.05 C and low capacity decay of 0.05% per cycle at 1 C, as well as excellent rate capability (449 mAh g(-1)at 2 C).
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