Unexpected improved performance of ALD coated LiCoO2/graphite li-ion batteries
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- Unexpected improved performance of ALD coated LiCoO2/graphite li-ion batteries
- Jung, Yoon Seok; Lu, Peng; Cavanagh, Andrew S.; Ban, Chunmei; Kim, Gi-Heon; Lee, Se-Hee; George, Steven M.; Harris, Stephen J.; Dillon, Anne C.
- Atomic layer deposition coatings; Characterization techniques; High voltage; Li-ion batteries; Natural graphite; Negative electrode; Positive electrodes
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED ENERGY MATERIALS, v.3, no.2, pp.213 - 219
- The performance of Al2O3 atomic layer deposition (ALD) coatings for LiCoO2/natural graphite (LCO/NG) batteries is investigated, where various permutations of the electrodes are coated in a full battery. Coating both electrodes with approximate to 1 nm of alumina as well as coating only the LCO (positive electrode) enables improved performance when cycling at high voltage, where the LCO is known to degrade. However, we found that coating only the NG (negative electrode) also improves the performance of the whole battery when cycling at high voltage. Under these conditions, the uncoated LCO (positive electrode) should degrade quickly, and the NG should be unaffected. A variety of characterization techniques show the surface reactions that occur on the negative electrode and positive electrode are related, resulting in the enhanced performance of the uncoated LCO.
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