Anode

Prelithiated Si/C Anodes

Anode

Prelithiated Si/C Anodes

A new transfer-printing prelithiation process applied to graphite and Si/C anodes demonstrates higher initial coulombic efficiency and energy density Lithium loss during cell formation results in a decreased initial Coulombic efficiency and energy density. Lithium loss is even worse in Si-based anodes due to volumetric changes and defect sites. Different prelithiation methods are commonly used to embed extra Li in the anode material to replenish the loss of lithium from the cathode. Researchers at Tsinghua University developed a roll-to-roll electrodeposition and transfer-printing system to produce pre lithiated graphite and Si/C anodes. The system includes: 1. Lithium electrodeposition on copper foil 2. Surface cleaning 3. Transfer-printing of prefabricated anodes 4. Continuous production of prelithiated electrodes This method resulted in high initial Coulombic efficiencies of 99.99% for graphite anode and 99.05% for Si/C anode half cells and improved the initial Coulombic efficiency and energy density of full cells. A fast and low-cost prelithiation process that is compatible with roll-to-roll manufacturing can unlock the full potential of silicon-based anodes.

Academia | P. 212 Source: C. Yang, H. Ma, R. Yuan, K. Wang, K. Liu, Y. Long, F. Xu, L. Li, H. Zhang, Y. Zhang, X. Li and H. Wu

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