THEORETICAL STUDY ON ZnO COATING EFFECTS ON THE CATHODE MATERIAL TO PREVENT THE FORMATION OF THE SOLID ELECTROLYTE INTERPHASE (SEI) AT THE ELECTRODE-ELECTROLYTE INTERFACE IN LITHIUM-ION BATTERIES
Li-ion batteries with metal oxide transition (LMO) cathode material are projected to be a candidate for the next-generation batteries due to its high theoretical capacity. However, batteries of this type suffer from several problems in their cathodes, such as the formation of solid electrolyte inter...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/39442 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Li-ion batteries with metal oxide transition (LMO) cathode material are projected to be a candidate for the next-generation batteries due to its high theoretical capacity. However, batteries of this type suffer from several problems in their cathodes, such as the formation of solid electrolyte interface (SEI), cathode degradation, and transition metal dissolution. One possible solution to solve these problems is by deposition of coatings on the cathode. ZnO coating is one of the promising coating materials as previous research has shown that thick ZnO coatings prevent cathode degradation on LiCoO2 cathodes.
In this final project, we study the interaction between ZnO surfaces and EC molecules as well as Li diffusion characteristics in ZnO coatings in order to investigate ZnO coatings effects on battery performance in more depth. DFT-based computation have been applied to determine the free energy diagram of the EC oxidation reaction and calculate the activation energy of Li diffusion in ZnO coating. By analyzing the free energy diagram of EC oxidation reaction on ZnO surfaces, ZnO coating on the surface of Li-ion battery cathode can prevent EC decomposition. Furthermore, results show that Li diffusion in ZnO is not fast enough to allow reasonable battery performance, but oxygen vacancy is found to speed up Li diffusion around the oxygen vacancy site. Therefore, designing ZnO coating with increased oxygen vacancy concentration is expected to improve ZnO coatings performance.
|
|---|