The efficient solid electrochemical corrosion prelithiation of graphite and SiOx/C anodes for longer-lasting lithium ion batteries

Wang, Yuke; Liang, Jia; Qiao, Yan; Dai, Wangqi; Xia, Heyi; Yu, Chengzhong; Hu, Yiwen; Ma, Ziqiang; Fu, Zheng‐Wen

doi:10.1016/j.jpowsour.2023.233402

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…In order to further analyze the main composition of the SEI film formed on the electrode surface after the prelithiation operation, the chemical composition of the prelithiated SiO/C composite negative electrode surface was measured by XPS, as shown in Figure 3. As shown in Figure 3a, after the liquid electrolyte prelithiation of the composite electrode sheet, the C 1s peak at 283.3 eV belongs to LiC x ; 37 in addition, the O 1s peak at 532 eV shown in Figure 3d as well as the Li 1s peak at 55.7 eV shown in Figure 3c belongs to Li y SiO z , 37 which indicates the successful prelithiation of the composite anode. The C 1s peak at 290.0 eV shown in Figure 3a and the Li 1s peak at 55.3 eV shown in Figure 3c belong to Li 2 CO 3 , 38 which is formed due to the decomposition of ethylene carbonate (EC) and diethyl carbonate (DEC).…”

Section: Resultsmentioning

confidence: 92%

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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Section: Resultsmentioning

confidence: 92%

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

Zhang,

Wang,

Feng

et al. 2024

ACS Appl. Mater. Interfaces

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“…The chemical compositions of the electrode surfaces were measured by XPS. As shown in Figure 4a, after the liquid electrolyte prelithiation of the composite electrode sheet, the C 1 s peak at 283.3 eV belongs to LiC x ; 36 in addition, the O 1 s peak at 532 eV shown in Figure 4d and the Li 1 s peak at 55.7 eV shown in Figure 4c belong to Li y SiO z , 36 which indicates that the prelithiation of the composite negative electrode was successful. The C 1 s peak at 290.0 eV shown in Figure 4a and the Li 1 s peak at 55.3 eV shown in Figure 4c belong to Li 2 CO 3 , 37 which are formed due to the decomposition of ethylene carbonate (EC) and diethyl carbonate (DEC).…”

Section: Resultsmentioning

confidence: 93%

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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“…Analysis of the peak positions and shapes provided critical information about the surface functional groups and chemical bonds, thereby determining the specific composition of the SEI film components. The high-resolution C 1s spectra (Figure a–c) were deconvoluted into five component peaks corresponding to C–Li (∼282.5 eV), C–C (∼284.8 eV), C–O (∼286.2 eV), CO (∼288.5 eV), and Li 2 CO 3 (290.2 eV) . The O 1s spectra (Figure d–f) were attributed to five components: Li 2 O (∼528.8 eV), LiOH (∼530.7 eV), Li 2 CO 3 (∼531.3 eV), CO (∼532.2 eV), and C–O (∼533.3 eV) .…”

Section: Resultsmentioning

confidence: 99%

Temperature-Regulated Prelithiated Graphite Anode for an Improved Lithium-Ion Capacitor

Lu,

Zheng,

et al. 2024

ACS Appl. Energy Mater.

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The efficient solid electrochemical corrosion prelithiation of graphite and SiOx/C anodes for longer-lasting lithium ion batteries

Cited by 11 publications

References 43 publications

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

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

Temperature-Regulated Prelithiated Graphite Anode for an Improved Lithium-Ion Capacitor

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The efficient solid electrochemical corrosion prelithiation of graphite and SiOx/C anodes for longer-lasting lithium ion batteries

Cited by 11 publications

References 43 publications

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

In Situ Construction of Specific SEI Layer Affords Effective Prelithiation

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

Temperature-Regulated Prelithiated Graphite Anode for an Improved Lithium-Ion Capacitor

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Product

Resources

About

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