High performance silicon electrode enabled by titanicone coating
Jordi Jacas Biendicho a, Zahilia Cabán Huertas a
a Catalonia Institute for Energy Research, Jardins de les Dones de Negre, 1, 2nd floor, sant adria del valles, barcelona, 8930, Spain
nanoGe Fall Meeting
Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
Solid State Batteries: Advances and challenges on materials, processing and characterization
Barcelona, Spain, 2022 October 24th - 28th
Contributed talk, Jordi Jacas Biendicho, presentation 239
Publication date: 11th July 2022

Developing high energy density and fast charge/discharge batteries requires new coatings strategies to overcome interfacial impedances between battery cell components. Silicon is a promising anode material for next-generation batteries due to its high volumetric capacity of 2190 mAhl-1 and low discharge potential of ~ 0.3 V vs Li/Li+. In this paper, we report the fabrication, characterisation and electrochemical performance of nano Si electrodes coated with titanicone (TiGL) using a combination of Atomic Layer Deposition (ALD) and Molecular Layer Deposition (MLD). The optimised coated electrode delivers a capacity of 1200 mAhg−1 at 1C for 350 cycles with a capacity retention of 93 % and a high C-rate performance of 150 mAhg−1 at 20C. The improved discharge capacity, efficiencies, rate capability and electrochemical stability are related to enhanced lithium kinetics, stable SEI formation, and better structural integrity of the TiGL coated electrode compared to bare silicon. The use of titanicone as an interface modifier is discussed in the frame of high capacity electrode materials and solid state batteries.

Funding from the European Comission and Tecnio Spring under the Grant agreement TECSPR18-1-0049 Towards High Energy All Solid State Lithium Batteries (SOLBAT) is gratefully acknowledged. IREC acknowledges support of Generalitat de Catalunya. Te authors like to acknowledge the support of Aalto University.

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