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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Energy Storage and Batteries II

CPP 19.2: Talk

Tuesday, March 19, 2024, 09:45–10:00, H 0111

Design, fabrication and nano-scale characterization of novel SEI layers — •Zhuijun Xu¹, Guangjiu Pan¹, Yajun Cheng², Yonggao Xia², and Peter Müller-Buschbaum^1,3 — ¹TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — ²Ningbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, China — ³TUM, MLZ, 85748 Garching, Germany

Lithium has a high specific capacity of 3860 mAh/g and a low electrochemical potential (-3.04 V), promising a high energy density lithium metal battery (LMB). However, the growth of lithium dendrites during charging and discharging would penetrate the separators in LMBs, which leads to short circuits. To inhibit the growth of lithium dendrites, we focus on optimizing the SEI layer through synergetic additives (FEC & LiNO3) in commercial carbonate electrolytes.

In the traditional carbonate electrolytes consisting of ethylene carbonate, dimethyl carbonate, lithium hexafluorophosphate, lithium bis (fluorosulfonyl)imide, the types and contents of the additives (FEC & LiNO3) are precisely regulated. We probe the electrochemical performance and morphology via gGalvanostatic tests and with scanning electron microscopy. Compared the control sample, Li-Li symmetrical cells, Li-Cu cells and Li-Ni83(LiNi0.83Co0.05Mn0.12O2) with the synergetic additives display a better electrochemical performance with smoother surface of lithium metal.

Keywords: lithium metal battery; interface modification; lithium nitrate; fluoroethylene carbonate; synergetic function