Illustration from Scientific Research

Schematic showing the main components in the SEI formed at the Li/HSE-LiI and the Li/HSE (13:1) interfaces, respectively. For HSE-LiI, the SEI has an organic outer layer and a compact, inorganic-rich inner layer that is more Li-ion conductive, while for HSE (13:1), the SEI is more organic and less conductive. For both the depth-profiling XPS and TOF-SIMS measurements, the Li-metal electrodes were obtained by disassembling the Li/HSE/Li symmetrical cells cycled with HSE-LiI or HSE (13:1) electrolytes at 0.1 mA cm−1for 20 cycles (0.1 mAh cm−1, 40 °C).

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