TY  - JOUR
A1  - Andersson, Edvin K. W.
A1  - Sångeland, Christofer
A1  - Berggren, Elin
A1  - Johansson, Fredrik O. L.
A1  - Kühn, Danilo
A1  - Lindblad, Andreas
A1  - Mindemark, Jonas
A1  - Hahlin, Maria
T1  - Early-stage decomposition of solid polymer electrolytes in Li-metal batteries
JF  - Journal of materials chemistry : A, Materials for energy and sustainability
N2  - 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.
Y1  - 2021
U6  - https://doi.org/10.1039/d1ta05015j
SN  - 2050-7488
SN  - 2050-7496
VL  - 9
IS  - 39
SP  - 22462
EP  - 22471
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -