Sallaz et al. Hybrid all-solid-state thin film MSC based on quasi amorphous ALD TiO$_2$ electrode - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles ACS Applied Energy Materials Year : 2022

Sallaz et al. Hybrid all-solid-state thin film MSC based on quasi amorphous ALD TiO$_2$ electrode

Abstract

In this work, nanometric (6–21 nm thick) amorphous TiO$_2$ films have been elaborated and characterized in liquid- and solid-state electrolyte (LiPON) half-cell architectures. For all considered configurations, the volumetric capacity extracted from cyclic voltammetry and galvanostatic cycling within the 0.5–3 V potential range almost corresponds to the theoretical value expected for the Li$_x$TiO$_2$ (x ∼ 1) phase at low current density. Interestingly, TiO$_2$ films after LiPON deposition exhibited a thickness-independent constant initial amount of intercalated lithium ions and did not require a first activation process, in comparison to the liquid electrolyte configuration. Furthermore, the cooperative effects of high Li$^+$ intercalation kinetics and low interfacial charge transfer resistance for a 6 nm TiO$_2$ electrode led to an outstanding surface capacity of 0.7 μAh cm$^{–2}$ at 1 μA cm$^{–2}$ and high rate performance with 60% capacity holding ratio at 1 mA cm$^{–2}$, thus highlighting the extrinsic pseudocapacitive behavior of our sub-10 nm TiO$_2$ electrodes. A Li$_x$TiO$_2$ 6 nm/LiPON 100 nm/Pt hybrid micro-supercapacitor has been successfully fabricated, achieving an operating voltage window of 3 V and a surface capacitance of 94 μF cm$^{–2}$ at 50 mV s$^{–1}$. In addition, the device also exhibited 97% coulombic efficiency upon cycling for 10,000 continuous charge–discharge cycles. This work proposes an approach that allows us to adjust the Li-ion storage properties of TiO$_2$ by nanoengineering and gives insights into the electrochemical performance enhancement by taking advantage of the pseudocapacitance-assisted lithium storage mechanism.

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cea-04528485 , version 1 (01-04-2024)

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Valentin Sallaz, Sylvain Poulet, Jean-Marc Boissel, Jouhaiz Rouchou, Yann Lamy, et al.. Sallaz et al. Hybrid all-solid-state thin film MSC based on quasi amorphous ALD TiO$_2$ electrode. ACS Applied Energy Materials, 2022, 6 (1), pp.201-210. ⟨10.1021/acsaem.2c02742⟩. ⟨cea-04528485⟩
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