PEO-Li<sub>21</sub>Si<sub>5</sub> as a pre-lithiation and structural protection layer for lithium-ion batteries

Zhang, Zhiyong; Sun, Zhefei; Pei, Shanpeng; Liu, Yan; Luo, Linshan; Guo, Shengshi; Han, Xiang; Zhang, Ziqi; Wang, Fuming; Chen, Songyan

doi:10.1039/d4ta00897a

Cited by 2 publications

(1 citation statement)

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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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