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Reinforce the Adhesion of Gel Electrolyte to Electrode and the Interfacial Charge Transfer via In Situ Electrospinning the Polymeric Nanofiber Matrix
Author(s) -
Wang Lei,
Zhang Ran,
Dai Hongyun,
Yan Jiawei,
Zhang Jiali,
Zhong Min,
Shen Wenzhuo,
Guo Shouwu
Publication year - 2021
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000865
Subject(s) - electrolyte , materials science , electrospinning , electrode , electrochemistry , chemical engineering , lithium (medication) , nanofiber , scanning electron microscope , composite material , polymer , chemistry , medicine , engineering , endocrinology
The adhesion of a gel electrolyte to the electrode is one of the key factors to the electrochemical performance of lithium‐ion batteries (LIBs). Herein, gel electrolyte is prepared on the LiFePO 4 electrode through in situ electrospinning the poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVdF‐HFP) nanofiber matrix, followed by lithium salt solution loading. The interfacial interactions between the in situ electrospun PVdF‐HFP matrix and LiFePO 4 electrode before and after gelation are studied using dynamic thermomechanical analysis and scanning electron microscopy. The results demonstrate that the as‐prepared gel electrolyte can adhere tightly onto the LiFePO 4 electrode. LIBs (half coin cells) are assembled using the as‐obtained gel electrolyte to evaluate their electrochemical properties. The results show that the lithium‐ion and electron transfer rates crossing the interface between gel electrolyte and LiFePO 4 electrode are enhanced. The electrochemical performances of the half coin cells, including specific capacity, rate capability, and cycle stability, are improved significantly.