Project Details
Projekt
Dual-responsive organo-sulfur network cathodes for stable high capacity polymer batteries
Subject Area
Preparatory and Physical Chemistry of Polymers
Polymer Materials
Polymer Materials
Term
since 2020
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 441323218
Novel dual-responsive organo-sulfur networks will be designed, structurally characterized and deployed for stable and efficient cathode materials for polymer batteries. The central aims of this second period of the SPP 2248 are grouped into two areas: First, we will build on the successful use of NDI-sulfur networks prepared by inverse vulcanization, their use in batteries as well as the implementation of theoretical methodologies coupled to in-operando NEXAFS spectroscopy. Particularly, we will clarify the optimum sulfur chain length of short network strands between electrochemically active organic cross-linkers. We will attempt to uncover network homogeneity and distribution of strand lengths and how its width can be experimentally modulated. Furthermore, in-operando NEXAFS spectroscopy will accompany battery characterization and clarify the formation of detrimental irreversible polysulfide formation (Sx-Liy) under varying conditions. In the second area organic linkers will be (re)designed and used for network preparation by (inverse) vulcanization or cationic polymerization. By considering preliminary results and applying criteria of i) specific capacity, ii) cycling stability and iii) availability/ scalability, we will identify structure-function relationships from a libary of organocarbonyl monomers. Finally, the results from the two areas will be merged to simultaneously surpass specific capacities of purely organic batteries and improve the generally moderate cycling stabilities of organo-sulfur-based systems. The speciality of this project lies in the triad of theoretical methodologies, synthesis of battery materials and their detailed characterization, including advanced and powerful in-operando X-ray spectroscopies. The chances for a successful project are very high due to the existing collaboration of the groups Müller/ Sommer/ Walter, which will be continued and extended in the second period.
DFG Programme
Priority Programmes
Subproject of
SPP 2248:
Polymer-based batteries
