@article{AnderssonSangelandBerggrenetal.2021,
  author    = {Andersson, Edvin K. W. and S{\aa}ngeland, Christofer and Berggren, Elin and Johansson, Fredrik O. L. and K{\"u}hn, Danilo and Lindblad, Andreas and Mindemark, Jonas and Hahlin, Maria},
  title     = {Early-stage decomposition of solid polymer electrolytes in Li-metal batteries},
  series = {Journal of materials chemistry : A, Materials for energy and sustainability},
  volume    = {9},
  journal   = {Journal of materials chemistry : A, Materials for energy and sustainability},
  number    = {39},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {2050-7488},
  doi       = {10.1039/d1ta05015j},
  pages     = {22462 -- 22471},
  year      = {2021},
  abstract  = {Development of functional and stable solid polymer electrolytes (SPEs) for battery applications is an important step towards both safer batteries and for the realization of lithium-based or anode-less batteries. The interface between the lithium and the solid polymer electrolyte is one of the bottlenecks, where severe degradation is expected. Here, the stability of three different SPEs - poly(ethylene oxide) (PEO), poly(epsilon-caprolactone) (PCL) and poly(trimethylene carbonate) (PTMC) - together with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt, is investigated after they have been exposed to lithium metal under UHV conditions. Degradation compounds, e.g. Li-O-R, LiF and LixSyOz, are identified for all SPEs using soft X-ray photoelectron spectroscopy. A competing degradation between polymer and salt is identified in the outermost surface region (<7 nm), and is dependent on the polymer host. PTMC:LiTFSI shows the most severe decomposition of both polymer and salt followed by PCL:LiTFSI and PEO:LiTFSI. In addition, the movement of lithium species through the decomposed interface shows large variation depending on the polymer electrolyte system.},
  language  = {en}
}