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Charge–discharge reaction in all‐solid‐state battery (SSB) is governed by Li‐ion movements and large resistance at solid–solid interface degrades rate capability of the SSBs. Thus, lithium (Li) distribution and its movement around interface in static or operated SSBs should be clarified well. Here, it is reported that combined ion beam analysis of high‐energy elastic recoil detection and Rutherford backscattering spectrometry probing 9.0 MeV O4+ beams is a powerful technique to clarify static Li distribution around the interface, and that relative Li concentration change is correctly detected with reliable depth resolution in a few tens of nm scale. It is interesting to note that Li deficient region is formed inside the Li+‐conductive crystalline glass solid electrolyte, LATP, at around the LiCoO2/LATP interface with the thickness of 120 ± 30 nm. Additionally, presence of hydrogen around both interfaces and their migration with the voltages are also detected.

In this paper, we propose how to embed a signature seal to a picture under orthogonal wavelet transform. Three parts of multi-resolution representation are expressed in a vector and are related to each other. The maximum and minimum values among the entries in the vector are obtained and the absolute value of the direrence of them is used f o r controlling to embed the seal. When the seal is needed, we can extract it from the picture. It is clear from the experimental results that the seal does not prevent us from seeing the picture comfortably. Therefore it seems that this method could be used for signing our name in multi-media.

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