Active lithium replenishment to extend the life of a cell employing carbon and iron phosphate electrodes

Precipitated silica as filler for polymer electrolyte based on poly(acrylonitrile)/sulfolane

“…Again, lithium inventory loss is found to be the main cause of the capacity degradation of the LFP-based cell. Liu et al [64,65] investigated the discharge profiles using a differential analysis, and they confirmed that the loss of reversible Li is responsible for most of capacity fade. They also used external lithium source to replenish the cycled cathode which has lost 30 % of its capacity after 2,730 cycles.…”

Analysis of Electrochemical Reaction in Positive and Negative Electrodes during Capacity Recovery of Lithium Ion Battery Employing Recovery Electrodes

“…A lower recovery efficiency means that the more recovery electrodes are needed to recover the same capacity. The previous paper 19 reported that parasitic reactions on the battery casing material could affect recovery, but it did not elucidate the mechanism behind the low recovery efficiency. Thus, in this study, to obtain an optimum design for increased recovery efficiency, we investigated the mechanism of capacity recovery on the basis of the results of the discharge curve analysis and evaluation of the positive and the negative electrodes after recovery.…”

“…Another approach for increasing the lifetimes of LIBs is to decrease the capacity fade originating from capacity slippage by replenishing positive or negative electrodes with Li + from another Li reservoir. [19][20][21][22] Wang et al were the first to report the recovery phenomena by replenishing the positive electrodes with Li + as a paper. They opened the end cap of a degraded cylindrical cell and connected the opened cell to another electrochemical cell which contained a Li-conductive electrolyte and Li metal electrode.…”

“…Li + could be supplied from the bottom of the cylindrical cell. 19 Consequently, the cell recovered by more than 50% of the capacity fade. In addition, Ye et al…”

Correlation between lithium deposition on graphite electrode and the capacity loss for LiFePO 4 /graphite cells

“…Strieble et al [16,17] discussed the aging mechanisms of a commercial LFP/ graphite cell and showed that both the positive and negative electrodes well maintained their initial capacity, except a continuous cycleable lithium loss with increasing cycle number. Liu et al [18,19] confirmed that the loss of reversible lithium ion is responsible for most of the capacity loss for a LFP/graphite cell by using differential analysis of the discharge profiles. Deshpande et al [20] attributed the irreversible capacity loss to the consumption of lithium in the formation and growth of solid electrolyte interphase (SEI) on newly exposed graphite surface upon cycling.…”