Abstract
AbstractAs the most electronegative element, fluorine has a strong influence on material properties such as absorption behaviour or chemical and thermal stability. Fluorine can be easily integrated into coordination polymers (CPs) via a fluorinated acetate, here trifluoroacetate in Ba(CF3COO)2, or directly via a metal fluorine bond (BaF(CH3COO)). In the present study both possibilities of fluorine integration were tested and their effect on structure and properties of barium coordination polymers was investigated in comparison with the non‐fluorinated barium acetate (Ba(CH3COO)2). In addition to the study of their thermal behaviour and their decomposition temperature, the CPs structures were tested for their application as possible anode materials in lithium ion batteries and for their sorption of water and ammonia. The properties of the CPs can be traced back to the individual structural motifs and could thus trigger new design ideas for CPs in LIBs and/or catalysis.
Highlights
As the most electronegative element, fluorine has a strong influence on material properties such as absorption behaviour or chemical and thermal stability
The position of fluorine has a strong influence on material properties such as absorption behaviour or chemical and thermal stability of coordination polymers (CPs) and their performance as anode materials in lithium ion batteries (LIB)
Dynamic vapour sorption (DVS) eSyntax Warning: FoFiType1::parse a line has more than 255 characters, we don't support this
Summary
Steffen Zänker,[a, b] Gudrun Scholz,*[a] Wenlei Xu,[a] Franziska Emmerling,*[a, b] and Erhard Kemnitz[a]. The high electronegativity of fluorine is crucial for interactions with Li + ions and anode materials.[18] The fluorination of anode surfaces is another possibility to integrate fluorine into LIBs.[19,20] An improvement of the Li + transfer on the active material is always observed, if fluorine is used as a dopant, and this is attributed to the formation of defects in the structure These defects facilitate diffusion in the anode material and allow easier access to the metal centres.[21,22,23] In addition, the metal fluorine bond protects the material against the attack of HF, which is formed during the hydrolysis of the electrolyte lithium hexafluorophosphate, LiPF6.[24]. The selected CPs should be composed of linkers with the same carbon skeleton, metal, and a similar chemical composition but consider the two different fluorine positions in the networks
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