Electrochemically pre-lithiated SiO<sub>2</sub>@C nanocomposite anodes for improved performance in lithium-ion batteries

Ozen, Selin; Eroglu, Omer; Karatepe, Nilgun

doi:10.1088/1361-6528/acf37f

Cited by 6 publications

(2 citation statements)

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“…Prelithiation is believed to be an effective solution to the key problem of low Coulombic efficiency, and the direct compensation for lithium loss during the formation of SEI films can effectively increase the reversible specific capacity of lithium-ion batteries . At present, much research has been launched on prelithiation, mainly including chemical prelithiation, , electrochemical prelithiation, direct contact prelithiation, − and so on. Among them, chemical prelithiation mainly applies lithium-containing reactant additives with very strong reducing properties to approach the negative electrode, such as lithium biphenyl, − lithium naphthalene, lithium butyl, etc.…”

Section: Introductionmentioning

confidence: 99%

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

Zhang,

Zhong,

Yan

et al. 2024

ACS Appl. Nano Mater.

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Direct contact prelithiation is considered an important means of addressing the low Coulombic efficiency of Si-based anodes. However, few studies have been conducted on the inhibition of volume expansion of Si-based materials and the reduction of side reactions during direct contact prelithiation. In this paper, Li 2 SiF 6 crystals are generated in situ in an amorphous SiO matrix by a thermodynamic reaction between SiO and LiPF 6 , which is from the viewpoint of contact state at the interface between lithium source and negative electrode as well as the construction of mechanical buffer phase. On the one hand, Li 2 SiF 6 crystals can inhibit the volume expansion of SiO during prelithiation. On the other hand, Li 2 SiF 6 crystals act as an interfacial passivation layer to reduce local currents and inhibit the occurrence of side reactions during direct contact prelithiation. The analysis of the results showed that Li 2 SiF 6 crystals were embedded in an amorphous SiO matrix to prepare the SiO/C composite anode, and the strength of the crystals was utilized to inhibit the volume expansion of SiO during the direct contact prelithiation process. Meanwhile, due to its good ionic conductivity, a strong and tough LiF-rich solid electrolyte interphase (SEI) was constructed, which suppressed the volume expansion of the composite anode for the prelithiation process. The full battery assembled with NCM111 positive electrode still exhibits 94.5% capacity retention after 150 cycles at 0.5C current density.

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Section: Introductionmentioning

confidence: 99%

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

Zhang,

Zhong,

Yan

et al. 2024

ACS Appl. Nano Mater.

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“…Prestorage of lithium ions in the anode, i.e., prelithiation, is used to compensate for the loss of active lithium when the anode first starts to form the SEI film. , Therefore, prelithiation is considered one of the most suitable strategies to solve the problem of high specific capacity anode. − In recent years, many studies have been conducted on prelithiation techniques, including chemical prelithiation, − electrochemical prelithiation, − and direct contact prelithiation. − In this regard, the direct contact prelithiation method, in which the pass-through lithium source is to be contacted with the negative electrode, has the advantages of being environmentally friendly to manufacture, does not require complex equipment, and has a high degree of compatibility with current battery production processes . Cui et al proposed an in situ prelithiation method to integrate lithium metal mesh directly into battery components .…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

Zhang,

Wang,

Feng

et al. 2024

ACS Appl. Mater. Interfaces

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Silicon-based anodes have been attracting attention due to their high theoretical specific capacity, but their low initial Coulombic efficiency (ICE) seriously hinders their commercial application. Direct contact prelithiation is considered to be one of the effective means of solving this problem. By means of prelithiation, a specific solid electrolyte interphase (SEI) was constructed, which inhibited the volume expansion of the SiO/C composite anode during prelithiation and reduced the local current generated when the lithium source was in contact with the anode. On the one hand, it can reduce the side reactions derived from the decomposition of electrolytes in the prelithiation process, and on the other hand, it can slow down the prelithiation process and inhibit the volume expansion of the SiO/C composite anode in the prelithiation process. The results of XPS, TOF-SIMS, and other tests show that the use of an electrolyte whose main component is LiTFSI can construct SEI film whose main component is LiF, which to a certain extent can slow down the rate of prelithiation, reduce the local current generated when the lithium source is in contact with the negative electrode, minimize the occurrence of side reactions, and inhibit the volume expansion of the negative electrode material. The full battery assembled with NCM111 positive electrode still exhibits 83.5% capacity retention after 500 cycles at 1 C current density. These studies provide some ideas to enhance the performance of siliconbased materials.

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Core Shell Structured Silica/Porous Carbon Composite as an Efficient Anode for Lithium Ion Batteries

Gulavani,

Kanade,

Lokhande

et al. 2024

Energy Tech

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Si‐based materials are taken into consideration as suitable anode materials for lithium‐ion (Li‐ion) batteries due to their high specific capacity. However, their cycle life is limited due to high volumetric changes during discharging and charging in Li‐ion battery (LIB). Silica (SiO2) is abundantly present in nature, but standalone delivers moderate Li storage capacity. Commercially, graphite is considered as efficient anode in LIB. The current research focuses on improving the performance of silica as anode material to achieve the best specific capacity of LIBs. Herein, the core‐shell‐structured silica/porous carbon composite (50:50, wt%) is synthesized using a hydrothermal method. The shell of porous carbon not only covers the core silica but also provides a very high surface area of ≈1057 m2 g−1 to the composite. The synthesized silica/porous carbon composite acts as an active anode material in Li‐ion half‐cell, which shows the best specific capacity of ≈642 mAh g−1 at 700 cycles at 100 mA g−1 current density and a high capacity retention of ≈97%. The porous carbon on silica helps in the uniform percolation of the electrolyte. It also provides a conducting path to the electrons and further reduces Li‐ion diffusion time by producing more active sites. The shell of porous carbon on core‐silica helps to suppress the volumetric changes that happen during the lithiation and de‐lithiation process. Due to these advantages, the core‐shell‐structured silica/porous carbon composite anode shows consistent and stable cycling performance over large number of cycles.

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Electrochemically pre-lithiated SiO₂@C nanocomposite anodes for improved performance in lithium-ion batteries

Cited by 6 publications

References 44 publications

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

Core Shell Structured Silica/Porous Carbon Composite as an Efficient Anode for Lithium Ion Batteries

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Electrochemically pre-lithiated SiO2@C nanocomposite anodes for improved performance in lithium-ion batteries

Cited by 6 publications

References 44 publications

Li2SiF6 In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

Li2SiF6 In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

Core Shell Structured Silica/Porous Carbon Composite as an Efficient Anode for Lithium Ion Batteries

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Product

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Electrochemically pre-lithiated SiO₂@C nanocomposite anodes for improved performance in lithium-ion batteries

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation

Li₂SiF₆ In Situ Embedded in an Amorphous SiO Matrix to Inhibit Volume Expansion during Prelithiation