| 초록 |
When forming a lithium battery, the active material particles and polymer binder materials are mixed to form a slurry, and applied to a metal current collector. For the slurry solvent, N-methyl-2-pyrolidone(NMP) has been received many attentions due to its stability and compatible quality with water. The slurry usually coated on the metal foil, and then evaporated with heat. During this process, coating surface has a void where the solvent was evaporation, and this can reduce the connection between active material and the conductive material. As a result, capacity of the LIB can be decrease. To solve the problem, we use Polyimide(PI) vapor deposition process which can cover the void. PI is thermally stable, so it can improve safety of LIB, and vapor deposition process can get high purity PI film. We coated a slurry on the metal foil and evaporate the solvent, then vapor deposited. The stability of the PI can provide safety of LIB, and also can cover voids which cause low performance. |
