Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 33, Pages 29978-29984Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10049
Keywords
Li-S batteries; interfacial mediate; molecule mediator; tris(4-fluorophenyl)phosphine; polysulfide
Funding
- National Natural Science Foundation of China [21875166, 51741207, 51572197, 21475096]
- Natural Science Foundation of Zhejiang Province for Distinguished Young Scholars [LR18E020001]
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The complicated reactions at the cathode-electrolyte interface in Li-S batteries are a large barrier for their successful commercialization. Herein, we developed a molecular design strategy and employed three small molecules acting as interfacial mediators to the cathodes of Li-S batteries. The theoretical calculation results show that the incorporation of tris(4-fluorophenyl)phosphine (TFPP) has a strong binding performance. The experimental results demonstrate that the strong chemical interactions between polysulfides and the F, P atoms in TFPP not only modify the kinetics of the electrochemical processes in the electrolyte but also promote the formation of short-chain clusters (Li2Sx x = 1, 2, 3, and 4) at the interface during the charge-discharge process. As a result, an optimized electrode exhibits a low capacity decay rate of 0.042% per cycle when the current rate is increased to 5 C over 1000 cycles.
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