Lithium Metal Transfer Laminate for Uniform Electrode Pre-Lithiation

The patent applies preliminary action by pre-lithiating the silicon-containing negative electrode before battery assembly. This is achieved through electrochemical methods where lithium ions are introduced to the electrode in advance, compensating for the initial irreversible capacity loss. The pre-lithiation process creates a lithium reservoir that compensates for subsequent lithium consumption during initial charging cycles, thereby maintaining cycle life while preserving the high capacity benefit of silicon materials.

The patent employs parameter changes by optimizing key process parameters of the electrochemical pre-lithiation method. This includes controlling the pre-lithiation time, current density, and electrolyte composition to achieve effective pre-lithiation while minimizing resource consumption. By optimizing these parameters, the method reduces production costs and improves manufacturing efficiency while maintaining the reliability benefits of pre-lithiation.

The patent uses an intermediary approach by employing a solid electrolyte interface (SEI) layer as a mediator during the lithium metal transfer process. This SEI layer forms a protective barrier that controls lithium ion transport, enabling smooth and controlled transfer of lithium from the lithium metal layer to the silicon-containing electrode. The intermediary SEI layer prevents direct contact between lithium metal and the electrode active material, reducing safety risks and improving transfer control while effectively reducing initial irreversible capacity.