Min HONG, Zhiyong WANG, Zhangqin SHI, et al. Three-dimensional composite Li metal anode by simple mechanical modification for high-energy batteries. P569–584
Compared with traditional graphite or newly-emerged Si-based electrode, Li metal is recognized as one of the most promising anode materials for next generation high energy density batteries on account of its ultrahigh theoretical capacity and lowest redox potential. But the “hostless” deposition problem lacks focus and remains unsolved. Fortunately, a series of composite Li metal anodes with a three-dimensional (3D) current collector has been proposed to tackle the “hostless” deposition problem by maintaining a stable electrode volume. Moreover, this design has been shown to be also effective on dendrite suppression since the increased surface area lowers local current density. Various types of 3D (and/or) composite Li anode have been developed successfully based on the softness and ductility of Li metal using simple mechanical modifications, which get rid of harsh experimental conditions, high temperatures, complex procedures, and the necessity of delicate instruments. At the very beginning, an intuitively 3D structured Li metal was fabricated by the simple mechanical surface modification technique, such as the mechanical micro-needle or the mechanical roll-press technique. In the following sections of this mini review, we summarized recently published works relating to this mechanical strategy. We hope this mini review may help to highlight the significance and effectiveness of this mechanical technique, and promise its future success in other battery chemistries based on metal anodes.
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