(a) The initial charge–discharge curves of CLO prelithiation agent cathode at 50 mA/g in the 0.2 to 4.3 V range. The short discharge platform (≈2.75 V) corresponds to the O2 oxidation reaction. The discharge platform (≈1.1 V) corresponds to the phase conversion reaction of Co3O4. Insert: corresponding the in situ sXRD patterns. The sXRD peak intensities of CLO prelithiation agent cathode at 2θ=9.1° and 10.7° (PTFE), 2θ=9.4° and 10.3° (CLO), 2θ=10.4° (Co3O4), respectively. (b) TEM images of charged CLO prelithiation agent cathode at 4.3 V. Insets present the corresponding SEAD patterns. (c) Co K‐edge X‐ray absorption near‐edge structure (XANES) spectra at different voltage states and corresponding difference spectrum. (d) Co K‐edge FT‐EXAFS spectra of collected at different charge/discharge states and corresponding difference spectrum. (e) The corresponding Wavelet‐transformed Co K‐edge EXAFS. Color 3D WT EXAFS spectra showing the difference between the WT‐EXAFS spectra of the Co−O shell and Co−Co shell (initial charge to 4.3 V vs. OCV (f) and discharge to 1.5 V vs. initial charge to 4.3 V (g)).

(a) The initial charge–discharge curves of CLO prelithiation agent cathode at 50 mA/g in the 0.2 to 4.3 V range. The short discharge platform (≈2.75 V) corresponds to the O2 oxidation reaction. The discharge platform (≈1.1 V) corresponds to the phase conversion reaction of Co3O4. Insert: corresponding the in situ sXRD patterns. The sXRD peak intensities of CLO prelithiation agent cathode at 2θ=9.1° and 10.7° (PTFE), 2θ=9.4° and 10.3° (CLO), 2θ=10.4° (Co3O4), respectively. (b) TEM images of charged CLO prelithiation agent cathode at 4.3 V. Insets present the corresponding SEAD patterns. (c) Co K‐edge X‐ray absorption near‐edge structure (XANES) spectra at different voltage states and corresponding difference spectrum. (d) Co K‐edge FT‐EXAFS spectra of collected at different charge/discharge states and corresponding difference spectrum. (e) The corresponding Wavelet‐transformed Co K‐edge EXAFS. Color 3D WT EXAFS spectra showing the difference between the WT‐EXAFS spectra of the Co−O shell and Co−Co shell (initial charge to 4.3 V vs. OCV (f) and discharge to 1.5 V vs. initial charge to 4.3 V (g)).

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