Lithium Metal Anodes and Rechargeable Lithium Metal Batteries by Ji-Guang Zhang Wu Xu & Wesley A. Henderson

Author:Ji-Guang Zhang, Wu Xu & Wesley A. Henderson
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Ota et al. plated/stripped Li on a Ni electrode in a 1 M LiBETI-EC/THP (1/1) electrolyte using different amounts of plated charge (Ota et al. 2004a, c). The initial deposits had a fibrous shape, but with increasing applied charge, these grew into larger and larger particle/nodule-like structures (Fig. 3.37). After 50 cycles, the residual interphasial layer thicknesses (after stripping) for the plating/stripping with 0.5, 1.0, and 2.0 C cm−2 plated charge were 11, 26, and 49 µm, respectively (Fig. 3.37), indicating that the thickness of this layer roughly scales with the amount of plated charge. The cycling CE in the initial cycles was highest for the largest plated charge, but comparable CE values were obtained irrespective of the amount of plated charge after 10 or so cycles, and these values slowly decreased upon continuous cycling (Fig. 3.38). The larger particles may be the reason for the higher CE, but it is unclear whether the same particle deposition characteristics are retained after repeated cycling with the buildup of the interphasial layer on the electrode surface.

Fig. 3.37SEM images of Li deposition for variable plated charge for Li plating on a Ni substrate in a 1 M LiBETI-EC/THP (1:1) electrolyte: a–c surface morphology after the initial deposition at 0.2 mA cm−2 and d–f cross-sectional morphology after 50 cycles at plating/stripping current densities of 0.2/0.6 mA cm−2, respectively. Reproduced with permission—Copyright 2004, The Electrochemical Society (Ota et al. 2004a)

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