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Abstract The rapid growth of lithium (Li) dendrites has long hindered the development of all‐solid‐state lithium‐metal batteries (ASSLMB). Here, a composite soft carbon (SC)‐nano Si 3 N 4 (SiN) interlayer (SC‐SiN) is designed for in situ formation of Li 3 N network (with high ionic conductivity/diffusivity) after lithium embedding in nano‐Si 3 N 4, promoting the rapid migration of Li + and guiding the metal Li to be deposited uniformly in a 3D manner within the interlayer. It can solve the problem of rapid consumption of Li + and local charge accumulation at the interface of solid electrolyte and Li metal anode, thus avoiding the growth of Li‐dendrites. The resulting LCO/LPSCl/SC‐SiN‐Li ASSLMB achieves ultra‐high current density (12.5 mA cm −2 ) and ultra‐long cycle life (22 000 cycles with no degradation), as well as ultra‐high area capacity area capacity (15 mAh cm −2 ) and energy density (402.5 Wh kg −1 ), all of which break existing ASSLMB records. In addition, it is capable of 600 cycles at an areal capacity of 2.7 mAh cm −2 and 2 C (85.7% capacity retention). A pouch cell is also assembled to delivers high energy density (>320 Wh kg −1 ). These confirm the application potential of this configuration and are one of the most critical breakthroughs toward the commercialization of the ASSLMB.
Wang et al. (Tue,) studied this question.