A comparison study of capacity degradation mechanism of LiFePO4-based lithium ion cells

Trimethyl borate and triphenyl borate as electrolyte additives for LiFePO4 cathode with enhanced high temperature performance

“…These results are attributed to the additives reducing or preventing reaction of impurities such as HF, H 2 O and ReOH with electrolyte components such as EC, DMC and PF 6 À . Such reactions contribute to formation of a performance-degrading SEI on the LiFePO 4 surface, and also tend to dissolve Fe-ions into the electrolyte from the impurities containing iron atoms in the LiFePO 4 raw material [5,24]. The performance of TMB is seen to be better than TPB.…”

Synthesis and Electrochemistry Study of P2- and O3-phase Na2/3Fe1/2Mn1/2O2

“…The gradual degradation of reversible capacities shown in figure 5a) for half-cell and 7c) for full-call despite the structural stability imply that the degradation mechanism is a combination of complex side reactions such as solid electrolyte interface formation, electrolyte degradation, internal resistance, etc. [26,27] The lattice parameters of P2-phase at the end of 25 th cycle (a = 2.9437(2) Å and c = 11.164(1) Å) compared to those of pristine electrode (a = 2.9309(2) Å and c = 11.219(2) Å) reflect the increasing concentration of Na + in the interlayer space at the end of discharge. As Na + intercalates into the interlayer space, the concentration of larger ion Mn 3+ increases, and therefore, oxide layer expands.…”

In Situ Temperature Evolution and Failure Mechanisms of LiNi0.33Mn0.33Co0.33O2Cell under Over-Discharge Conditions

“…Many efforts have been given to investigate the abuse operations of LIBs. Studies have been done to thermal abuse [6][7][8], mechanical abuse [9][10][11], and electrical abuse [12][13][14]. Among electrical abuse, more attentions have been attracted to the overcharge tests, since overcharging can cause hazardous situations, such as gas generation, high temperature and even explosion.…”