Enhanced High-Temperature Cycle Life of LiFePO[sub 4]-Based Li-Ion Batteries by Vinylene Carbonate as Electrolyte Additive

Abstract

Addition of vinylene carbonate ͑VC͒ in electrolyte solution has been found to greatly improve the high-temperature ͑55°C͒ cycling performance of LiFePO 4-based Li-ion batteries. It has been established that the VC additive remarkably suppresses Fe dissolution from LiFePO 4 cathode and hence, subsequent Fe deposition on the anode side. Furthermore, the VC additive also significantly reduces formation of solid-electrolyte interface layers on both LiFePO 4 cathodes and mesocarbon microbead ͑MCMB͒ anodes. With VC addition, a 18650-type LiFePO 4 /MCMB cell has been shown to retain ϳ80% capacity after 980 cycles at 55°C under 1-3 C charge-discharge rates. This is in contrast with more than 25% capacity loss after merely 100 cycles when no VC is added.

Effect of cyano dipolar groups on the performance of lithium-ion battery electrospun polyimide gel electrolyte membranes

“…This flat plateau corresponds to the Fe 2+ /Fe 3+ redox reaction and depends on the scan rate [42]. The cyclability of the electrospun membranes ( Figure 8) is compared in relation to a commercial glass fiber separator.…”

Standardization Work for BEV and HEV Applications: Critical Appraisal of Recent Traction Battery Documents

“…In the literature, one can find a number of papers regarding characterization of batteries for modeling and performances purposes. In [9][10][11][12][13][14][15][16][17][18][19] some test methodologies are introduced in order to obtain the general characteristics of lithium-ion batteries. However, the used test procedures are mainly based on constant current rates during discharge phase.…”

Influence of AlF3 coating on the electrochemical properties of LiFePO4/graphite Li-ion batteries

“…However, a large electrode/electrolyte interface will be resulted due to the enlargement of the surface area associated with the minimization of the particle size [29]. Previous researches show that LiFePO 4 /graphite (for instance, mesocarbon microbead (MCMB)) and LiFePO 4 /Li cells exhibited poor cycleability [18,30,31]. Such rapid fade of the capacity of LiFePO 4 cathode, especially at elevated temperatures (such as 55 • C [18,29], 60 • C [30]) against graphite anode, is caused by the dissolution of Fe from LiFePO 4 in the conventional LiPF 6 electrolyte.…”