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Electrochemical tolerance of silicon-based Li-ion batteries to formation current rate and discharge voltage window.

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Title: Electrochemical tolerance of silicon-based Li-ion batteries to formation current rate and discharge voltage window.
Authors: Zhang, Sheng S.1 (AUTHOR) shengshui.zhang.civ@army.mil
Source: Journal of Solid State Electrochemistry. Jul2026, Vol. 30 Issue 7, p2619-2626. 8p.
Subjects: Lithium-ion batteries, Lithium cell electrodes, Electric double layer, Electrochemical analysis
Abstract: Hybridization of Si with SiOx has been recognized as an effective strategy to enhance the performance of Si-based Li-ion batteries by mitigating the rapid capacity fade of Si and the low initial coulombic efficiency of SiOx. In this work, a 1:2 (wt.) microsized Si/SiOx hybrid electrode is employed to elucidate the distinct electrochemical characteristics of Si-based Li-ion cells compared with conventional graphite-based systems. Owing to their fundamentally different Li storage mechanisms, Si-based cells do not need time-consuming formation cycles typically used to form a robust solid electrolyte interphase (SEI) in graphite electrodes. Furthermore, the role of the SEI in stabilizing cycling performance differs substantially between the two systems. Remarkably, Si-based Li-ion cells exhibit excellent tolerance to deep discharge. Testing on Si/LiNi0.8Co0.1Mn0.1O2 (NCM811) coin cells demonstrates stable cycling even when discharged to 0.2 V, without detrimental effects on cycling stability. Despite this advantage, relatively fast capacity fading remains a critical challenge, and the underlying mechanisms are analyzed. The findings of this work provide new fundamental insights into the electrochemical characteristics of Si-based Li-ion batteries and offer guidance for improving the cycling performance of Si-based Li-ion batteries. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Hybridization of Si with SiOx has been recognized as an effective strategy to enhance the performance of Si-based Li-ion batteries by mitigating the rapid capacity fade of Si and the low initial coulombic efficiency of SiOx. In this work, a 1:2 (wt.) microsized Si/SiOx hybrid electrode is employed to elucidate the distinct electrochemical characteristics of Si-based Li-ion cells compared with conventional graphite-based systems. Owing to their fundamentally different Li storage mechanisms, Si-based cells do not need time-consuming formation cycles typically used to form a robust solid electrolyte interphase (SEI) in graphite electrodes. Furthermore, the role of the SEI in stabilizing cycling performance differs substantially between the two systems. Remarkably, Si-based Li-ion cells exhibit excellent tolerance to deep discharge. Testing on Si/LiNi0.8Co0.1Mn0.1O2 (NCM811) coin cells demonstrates stable cycling even when discharged to 0.2 V, without detrimental effects on cycling stability. Despite this advantage, relatively fast capacity fading remains a critical challenge, and the underlying mechanisms are analyzed. The findings of this work provide new fundamental insights into the electrochemical characteristics of Si-based Li-ion batteries and offer guidance for improving the cycling performance of Si-based Li-ion batteries. [ABSTRACT FROM AUTHOR]
ISSN:14328488
DOI:10.1007/s10008-026-06568-2