The maximum endurable current density of lithium battery cycling without cell failure in SSLMB is generally defined as critical current density (CCD). Therefore, CCD is an important parameter for the application of SSLMBs, which can help to determine the rate-determining steps of Li kinetics in solid-state batteries.
The critical current density (CCD) is an important standard for future solid‐state Li metal batteries (SSLMBs), which is highly related to power density and fast charge capability. The CCD can help to unravel the rate determining factors of Li kinetics including special mass transport and charge transfer at solid–solid interfaces.
Critical current density of all-solid-state Li metal batteries were evaluated and compared in symmetric and full cell. The relationship between fabrication pressure applied duration and critical current density in symmetric cell were revealed.
Symmetric Li cells exhibit a high critical current density (CCD) of 4.0 mA·cm −2 and an excellent cycling stability for 200 h at 4.0 mA·cm −2. SSBs with polymeric sulfur-polyacrylonitrile (SPAN) cathode achieve a high discharge capacity of 1149 mAh·g −1 with a capacity retention of 91% after 100 cycles (0.2 C).
The relationship between fabrication pressure applied duration and critical current density in symmetric cell were revealed. A constant pressure setup mitigates the volume change during cycling, and effectively increase the critical current density of the full cell.
However, achieving the key U.S. DOE milestone of a power density of 33 kW L –1 appears to be a significant hurdle in current ASSLBs. One of the main reasons is that advancements in solid electrolyte (SE) conductivity have been prioritized over the critical current density (CCD) when employing an elemental Li anode.
[29, 65] If the LMA fails during stripping because of pore formation and contact loss, the critical current density for stripping (CCD LMA) is exceeded. If, however, a short circuit occurs at the plating electrode, the critical current density for …