Communication - anode-free lithium metal batteries: A case study of compression effects on coin cell performance

Here, we demonstrate that altering the cell configuration can increase the compression level inside a coin cell, resulting in superior charge and discharge cycle performance. A normal anode-free coin cell's capacity drops to zero within 20 cycles, while the more compressed cell retains 150 mAh g-1 at the 20th cycle, which is 87.3% of the first cycle discharge capacity. EIS shows that the compressed cell possesses lower bulk resistance and charge transfer resistance through SEI. It also leads to homogeneous Li deposition free of dendrites. Our finding enables a more accurate assessment of anode-free Li-metal batteries in a coin cell.