Effects of volume-confinement on lithium-ion battery with silicon-based anode

Jhan, Cheng-Ying; Wang, Pin-Sen; Sung, Shi-Hong; Tzeng, Yonhua

doi:10.1016/j.mtcomm.2024.108578

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…Furthermore, the potential scanning rate not only impacts the values of I dlp and I dhp but also alters the I dlp /I dhp value ratio. 38,39 Similar observations have been reported elsewhere, for example, Zheng et al 24 demonstrates the splitting of a single I d peak into two peaks when the CV potential scanning range is narrowed from 0.01 V-1.5 V to 0.05-1.5 V. Moreover, Refs. 40-45 document an increase in I dlp and I dhp with the cycle number during the initial cycles.…”

Section: Resultssupporting

confidence: 83%

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

Zhang

2024

J. Electrochem. Soc.

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Research on silicon (Si) as an anode material for Li-ion batteries has spanned two decades; however, certain electrochemical properties of Si remain unclear. Specifically, the cyclic voltammogram (CV) pattern of Li/Si cells varies from case to case, influenced not only by the material but also by the experimental conditions. In this work, slow cyclic voltammetry is employed to investigate Li/Si cells, resulting in three distinct CV patterns. It is further observed that the CV pattern, particularly during the delithiation, is contingent on the state-of-lithiation (SOL) during lithiation and correlates with the capacity fade of Li/Si cells in subsequent cycles. Additionally, it is revealed that the primary mechanism for capacity fade differs between nano-sized silicon (Si-NP) and micro-sized silicon (Si-MP). In brief, capacity fade in Li/Si-NP cells predominantly arises from parasitic reactions between the highly lithiated Li-Si alloy and electrolyte solvents, exacerbated by the large specific surface area of Si-NP materials, whereas capacity fade in Li/Si-MP cells is primarily attributed to the Li electrode rather than the Si-MP electrode due to the restricted lithiation of Si-MP materials. Finally, this work concludes that limiting the SOL of Li/Si cells offers a straightforward and effective pathway to achieving stable cycling performance.

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Section: Resultssupporting

confidence: 83%

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

Zhang

2024

J. Electrochem. Soc.

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“…Their high energy density, longevity, and ability to be recharged multiple times make them indispensable for modern technology. [1][2][3] The olivine-structured LiMn x Fe 1−x PO 4 is one of the most widely used cathode materials for lithium-ion batteries because of its excellent cycle performance, high safety performance, good theoretical capacity, and low cost. [4][5][6] The voltage platform of LiMn x Fe 1−x PO 4 is lower than that of LiCoO 2 , LiMn 2 O 4 , and LiNi 0.5 Mn 1.5 O 4 et al, which means lower energy density of LiMn x Fe 1−x PO 4 battery.…”

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confidence: 99%

The Effect of Oxygen Vacancy Defects on the Structure and Electrochemical Behaviors of LiMn_0.65Fe_0.35PO₄ Cathode

Zhang,

Ke,

Wang

et al. 2024

J. Electrochem. Soc.

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The presence of oxygen vacancy defects significantly impacts the crystal structure and electrochemical attributes of phosphate cathodes. In this investigation, LiMn0.65Fe0.35PO4 materials with varying levels of oxygen vacancy defects were synthesized via hydrogen plasma-induced reduction. It was observed that the content of oxygen vacancy defects on the crystal surface increased proportionately with the rise in hydrogen (H2) flow rate. Notably, the LMFP-3 sample, prepared with an H2 flow rate of 10 mL min-1, demonstrated superior electrochemical performance, characterized by a 159.7 mAh g-1 discharge capacity at 0.1C and a remarkable 99.8% capacity retention at 5C after 200 cycles. This enhancement in electrochemical performance is attributed to the improved intrinsic conductivity of the LiMn0.65Fe0.35PO4 material due to the presence of oxygen vacancy defects. However, it is important to note that an excessively high H2 flow rate can lead to the formation of Fe2P impurities, which hinder lithium ion (Li+) diffusion. Furthermore, theoretical calculations conducted using density functional theory provide a rational explanation for the observed improvement in electronic conductivity. The introduction of oxygen vacancy defects results in a significant reduction in the Band gap, which is highly beneficial for enhancing the intrinsic conductivity of the LiMn0.65Fe0.35PO4 materials.

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Effects of volume-confinement on lithium-ion battery with silicon-based anode

Cited by 2 publications

References 33 publications

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

The Effect of Oxygen Vacancy Defects on the Structure and Electrochemical Behaviors of LiMn_0.65Fe_0.35PO₄ Cathode

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Effects of volume-confinement on lithium-ion battery with silicon-based anode

Cited by 2 publications

References 33 publications

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

Unveiling Electrochemical Properties of Silicon for Stable Cycling Performance of Silicon Anode Materials

The Effect of Oxygen Vacancy Defects on the Structure and Electrochemical Behaviors of LiMn0.65Fe0.35PO4 Cathode

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The Effect of Oxygen Vacancy Defects on the Structure and Electrochemical Behaviors of LiMn_0.65Fe_0.35PO₄ Cathode