Two-Dimensional Siloxene Nanosheets: Understanding the Effect of Heat Treatment on the Surface Chemistry and Resulting Electrochemistry in Lithium-Based Batteries.

• Tác giả: David J Arnot, Patrick J Barry, David C Bock, Daniel A Fischer, Cherno Jaye, Steven T King, Arun Kingan, Jessica Luo, Edelmy J Marin Bernardez, Amy C Marschilok, Andrew Nicoll, Esther S Takeuchi, Kenneth J Takeuchi, Xiao Tong, Lei Wang, Shan Yan
• Ngôn ngữ: eng
• Thông tin xuất bản: United States : ACS applied materials & interfaces , 2025
• Bộ sưu tập: NCBI
• ID: 739954

Tóm tắt

Two-dimensional (2D) silicon materials are conceptually appealing as negative electrode materials in lithium-ion batteries due to their layered morphology, which can accommodate (de)lithiation-induced volume changes. Herein, heat treatment of 2D Siloxene materials was used to modify the surface functional groups to determine the impact on the electrochemical behavior. Spectroscopic characterization of the heat-treated nanosheets confirmed the loss of oxygenated and hydride surface functional groups with an increased annealing temperature. Formation and disproportionation of the amorphous suboxides with increasing heat treatment were affirmed with lab and synchrotron-based measurements. A reduced irreversible capacity was observed for Siloxene with a higher temperature heat treatment consistent with the formation of a more favorable surface electrolyte interphase (SEI). A Siloxene-400||NMC622 full cell (prepared with 400 °C-annealed Siloxene (Siloxene-400) and LiNi