2020同步年報

056 ACTIVITY REPORT 2020 with limited fundamental under- standing, the performance of such a configuration for Li + storage with high capacity is yet to be improved. For this issue, Yi-Chun Lu and his colleagues utilized XANES TEY spectra at the O K-edge at TLS 20A1 for Li 2 O 2 -prefilled VC and Ru/VC electrodes in DG and DMSO electrolyte to reveal the Li + translocation paths in the Li-O 2 battery ( Fig. 3 ). Through cross- referencing the O K-edge spectra from samples in varied post-potential states in the electrode, their results provide systematic information to retrieve the chemical evolution of Li + , and success- fully reveal the potential window that highlights the strategies for simulta- neous decrease of charge potential and bypass of LiO 2 (e.g., redox media- tor) formation to enable efficient and reversible Li−O 2 batteries. (Reported by Tsan-Yao Chen, National Tsing Hua University) Fig. 2 : Structure of (BP-G)/PANI. (a) Schematic of (BP-G)/PANI. (b,c) SEM image (b) and Raman spectrum (c) of (BP-G)/PANI. (d) TEM image showing the crystalline domains of BP and a graphite flake covered with PANI. (e) High-resolution TEM image showing the merging of basal planes of BP and graphite. Every two BP layers match with three graphene layers. (f) Dark-field TEM image and P, C, and N elemental maps of (BP-G)/PANI. [Reproduced from Ref. 1] Fig. 3 : O K-edge XANES TEY spectra for Li 2 O 2 -prefilled VC and Ru/VC electrodes in DG and DMSO electrolyte. Spectra for Li 2 O 2 -prefilled VC electrode in (a,b) DG and (c,d) DMSO electrolyte. Spectra for Li 2 O 2 -prefilled Ru/VC electrode in (e,f) DG and (g,h) DMSO electrolyte. (i) Schematic illustration of superoxide reactions upon Li 2 O 2 oxidation in Li−O 2 batteries. [Reproduced from Ref. 2] (i)