Hitachi has developed capacity recovery technology to extend the service life of Lithium-Ion Batteries (LIBs) built into power storage systems in a non-destructive manner. This innovation promotes a shift to mainly renewable energy power sources for power systems and a transition to electric mobility.
Recently, direct recovery for spent LIBs makes the closed-loop circulation of electrode materials due to the direct use of degraded active materials as raw materials to produce fresh active materials. Thus its underlying sustainability of using less chemical agents and energy cost has increasingly acttracted attentions from battery community.
We developed an approach to substantially recover the isolated active materials in silicon electrodes and used a voltage pulse to reconnect the isolated lithium-silicon (Li x Si) particles back to the conductive network. Using a 5-second pulse, we achieved >30% of capacity recovery in both Li-Si and Si–lithium iron phosphate (Si-LFP) batteries.
Author to whom correspondence should be addressed. The accurate prediction of Li-ion battery capacity is important because it ensures mission and personnel safety during operations. However, the phenomenon of capacity recovery (CR) may impede the progress of improving battery capacity prediction performance.
Recent advancements in the electrochemical recovery of lithium-ion batteries are divided into two main approaches: electrochemical leaching and electrodeposition [21, 22, 23]. For electrochemical leaching, the electric current is applied to the battery materials, thus achieving the dissolution of metal ions in the solution.
There have been numerous publications focusing on remaining useful life (RUL) prediction methods for lithium-ion batteries. Model-based methods and data-driven methods are the two main strategies [ 5 ]. For model-based methods, the goal is to model the internal degradation process of lithium batteries.