Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 19, Pages 22505-22513Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c03902
Keywords
silicon anode; Fe-Si alloy; artificial solid electrolyte interphase; nucleophilic reaction; polysulfides
Funding
- International Science and Technology Cooperation of China [2019YFE0100200]
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By forming an artificial solid electrolyte interphase (ASEI) on the surface of ferrosilicon/carbon (FeSi/C) anode through a designed nucleophilic reaction of polysulfides with vinylene carbonate (VC) and fluoroethylene carbonate (FEC) molecules, it effectively prevents electrolyte infiltration and decomposition while enabling Li+ transport, thus stabilizing the FeSi/C anode interface. The ASEI-modified FeSi/C anode exhibits a large reversible capacity, excellent cycling stability, and greatly elevated cycling coulombic efficiency, potentially serving as a high-capacity anode of LIBs.
Si is being actively developed as one of the most promising high-capacity anodes for next-generation lithium-ion batteries (LIBs). However, low cycling coulombic efficiency (CE) due to the repetitive growth of the solid electrolyte interphase (SEI) film is still an issue for its application in full batteries. Here, we propose a strategy to in situ form an artificial solid electrolyte interphase (ASEI) on the ferrosilicon/carbon (FeSi/C) anode surface by a purposely designed nucleophilic reaction of polysulfides with vinylene carbonate (VC) and fluoroethylene carbonate (FEC) molecules. The as-formed ASEI layer is mechanically dense and ionically conducting and therefore can effectively prevent the electrolyte infiltration and decomposition while allowing Li+ transport across, thus stabilizing the interface of the FeSi/C anode. As a result, the ASEI-modified FeSi/C anode exhibits a large reversible capacity of 1409.4 mA h g(-1), an excellent cycling stability over 650 cycles, and a greatly elevated cycling CE of 99.8%, possibly serving as a high-capacity anode of LIBs.
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