Thin Film Cathodes for Li-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.

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.

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

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

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.

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