Thin Film Cathodes for Li-ion Batteries

Advanced Thin Film Cathodes for Lithium Ion Batteries

Z. Qi, H. Wang, Research, 2969510, (2020).

Highlights:

  • Current modification approaches on thin film cathodes and recent representative advancements of different modification approaches.

  • Existing challenges regarding the thin film cathodes and the future research directions in thin film cathode designs for advanced portable and personal electronics.

Enhancing electrochemical performance of thin film lithium ion battery via introducing tilted metal nanopillars as effective current collectors

Z. Qi, J. Tang, S. Misra, C. Fan, P. Lu, J. Jian, Z. He, V.G. Pol, X. Zhang, H. Wang, Nano Energy, 69, 104381, (2020).

Highlights:

  • Composite thin film cathode shows superior cycling performance compared to other reported pure Li2MnO3 thin film cathode with thickness ~ 10 times thicker.

  • The tilted Au pillar provides enhanced mechanical strength and shows optical anisotropy.

Li2MnO3 Thin Films with Tilted Domain Structure as Cathode for Li-Ion Batteries

Z. Qi, J. Tang, J. Huang, D. Zemlyanov, V.G. Pol, H. Wang, ACS Applied Energy Materials, 2, 5, 3461-3468, (2019).

Highlights:

  • Columnar morphology of Li2MnO3 thin films is demonstrated with very simple oblique angle deposition (OAD) technique, which provides porous structure that facilitates the Li intercalations and enhance rate performance.

  • This structure demonstrates a pseudocapacitive behavior for Li2MnO3 instead of diffusion-controlled intercalation process, yet still exhibits very high capacity

A new approach to investigate Li2MnO3 and Li(Ni0.5Mn0.3Co0.2)O2 mixed phase cathode materials

C. Jacob, J. Jian, Y. Zhu, Q. Su, H. Wang, Journal of Materials Chemistry A, 7, (2014).


HRTEM of NMC Film
Capacity of thin Film NMC Film

Highly Textured Li(Ni0.5Mn0.3Co0.2)O2 Thin Films on Stainless Steel as Cathode for Lithium-ion Battery

C. Jacob, T. Lynch, A. Chen, J. Jian, H. Wang, Journal of Power Sources, 241, (2013).

Highlights:

  • Epitaxial and highly textured Li(NixMnyCo1-x-y)O2 films are grown on various substrates, with one step high temperature pulsed laser deposition.

  • Initial capacity of 167 mAh g-1 and 125 mAh g-1 is obtained at 0.1 C and 0.5 C, respectively, for Li(Ni0.5Mn0.3Co0.2)O2 thin film on Au buffered stainless steel substrate .

  • Excellent capacity retention of 89% is obtained at 0.5 C after 100 cycles for the thin film cathodes.