Abstract
The downscaling of electronic devices requires rechargeable microbatteries with enhanced energy and power densities. Here, we evaluate self-assembled vertically aligned nanocomposite (VAN) thin films as a platform to create high-performance three-dimensional (3D) microelectrodes. This study focuses on controlling the VAN formation to enable interface engineering between the LiMn2O4 cathode and the (Li,La)TiO3 solid electrolyte. Electrochemical analysis in a half cell against lithium metal showed the absence of sharp redox peaks due to the confinement in the electrode pillars at the nanoscale. The (100)-oriented VAN thin films showed better rate capability and stability during extensive cycling due to the better alignment to the Li-diffusion channels. However, an enhanced pseudocapacitive contribution was observed for the increased total surface area within the (110)-oriented VAN thin films. These results demonstrate for the first time the electrochemical behavior of cathode-electrolyte VANs for lithium-ion 3D microbatteries while pointing out the importance of control over the vertical interfaces.
Original language | English |
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Pages (from-to) | 42208-42214 |
Number of pages | 7 |
Journal | ACS Applied Materials and Interfaces |
Volume | 14 |
Issue number | 37 |
Early online date | 6 Sept 2022 |
DOIs | |
Publication status | Published - 21 Sept 2022 |
Keywords
- Battery
- Epitaxy
- Nanocomposite
- Self-assembly
- Thin films
- UT-Hybrid-D