Increase in electronic resistance due to electrolyte wetting in LiB composite layer

The electronic resistance of the cathode composite layer in lithium-ion batteries is measured before wetting with an electrolyte. Therefore, there is no knowledge of the relationship between the electronic resistance after the cell is laboriously prepared as a battery and wetted with the electrolyte. In addition, there is little discussion of electron transfer between particles of acetylene black (AB), which is used as a conductivity aid in the cathode compound of lithium-ion batteries. The comparison between before and after wetting with an electrolyte has also only been discussed a little. Therefore, this study investigated the change in electronic resistance of AB before and after wetting with the electrolyte, and created three forms of AB: the electronic resistance of the AB powder itself, the electronic resistance of a composite electrode using AB, and a battery made using the composite electrode. As a result, in all three forms, the electronic resistance of the AB powder and the composite electrode increased when wetted with the electrolyte. In other words, in practical batteries, the electronic resistance should be evaluated after wetting rather than before wetting with the electrolyte. These findings could be useful for battery design.