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. 2015 Sep 28;5:14458. doi: 10.1038/srep14458

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(a) galvanostatic cycling curves of Li/Li symmetric cells based on the LE, NL/LE, and NPEM at current densities of 0.08 to 0.2 mA cm^–2, where each half-cycle life lasts for 5 h. (b) SEM images of the surface and cross-section of the NL-coated Li metal electrode of the NL/LE cell, and (c) the surface of the Li metal electrode of the NPEM cell after 20 cycles (100 h).