Pre-Lithiation of Silicon-Based Anodes via Electrolysis of Cost-Efficient Lithium Salts

Thematic block:


Other authors:




One of the main challenges for application of negative electrodes with high Si-content for high-energy lithium ion batteries is the huge volume expansion of Si upon lithiation and consecutive high irreversible capacities due to continuous formation of the solid/electrolyte interphase (SEI). To diminish the loss of active lithium and to enable anodes with high Si-contents (≥10 wt.%), pre-lithiation is considered to be an effective approach.
In this talk, electrochemical pre-lithiation by electrolysis of cost-efficient LiCl, here defined as ‘electrolytic pre-lithiation’, is investigated using Si thin films as model electrode.
The concept of pre-lithiation is presented and the consequences of pre-lithiation on the specific energy with respect to different Si/C electrodes are discussed using basic model calculations. Application of the sacrificial salt LiCl is enabled by development of novel electrolyte formulations based on γ-butyrolactone (GBL). Electrochemical properties and interphase formation are analysed by electrochemical methods in cell setups with a sacrificial lithium electrode. Optimisation of the pristine electrolyte with additives leads to reversible de/lithiation, a decrease of solvent decomposition, and a CEff in the range of standard carbonate-based electrolytes. The interphase formation on Si model electrodes is fundamentally investigated by X-ray photoelectron spectroscopy. Furthermore, the practical electrolysis setup is validated by systematic pre-lithiation experiments and failure mechanisms lowering efficiency of pre-lithiation are investigated by analytical methods. Eventually, applicability of the concept is shown by performance evaluation in LIB full cells.

Would you like to contact this author?
We are happy to forward your request / feedback.

[su_button url="" target="blank" background="#98c219" color="#ffffff" size="4" radius="0" icon="icon: envelope-open" icon_color="#fff"]EMAIL TO THE AUTHOR[/su_button]

ist eröffnet

Wir freuen uns auf Ihre Einreichung
bis zum 31. Oktober 2022