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It is based on the electron transfer principle, so that it can provide descriptions of the bulk content from very low to greater magnification. In addition, it is commonly used for the analysis of different morphologies of the Au‐NPs [44]. TEM also provides essential information about two‐ or more layer materials; the quadruple hollow shell structure of Co₃O₄ NPs is observed by TEM, for instance. In Li‐ion batteries such as the anode, these NPs have proven themselves to be exceptionally efficient. The porous multi‐shell structure induces shorter Li⁺ diffusion path lengths with ample annulled space for buffer volume expansion, good cycling efficiency, higher speed capacity, and essential capacity [45].