Polyimide gel polymer electrolyte-nanoencapsulated LiCoO2 cathode materials for high-voltage Li-ion batteries

Enhanced high voltage performances of layered lithium nickel cobalt manganese oxide cathode by using trimethylboroxine as electrolyte additive

“…Indeed, as shown in the F1s spectra, the film generated by the TMB-containing electrolyte contains less Li x PO y F z and LiF than the STD system. LiF has been found to increase the interfacial impedance [24], and hence, explaining the better rate capability of the LNCM cycled with 3% TMB.…”

Preparation and characterization of novel thermoset polyimide and polyimide-peo doped with LiCF3SO3

“…The frequency ranged from 40 Hz to 100 mHz at a perturbation voltage of 5 mV. The ionic conductivity values of the polymer electrolyte systems are calculated from the intercept of real part of the complex impedance plot, which is resistance of the film and known area using the Equation (1) [19,20]:…”

“…In the literature, ion-conducting polyimide membranes are selected as promising candidates for separating the electrodes because such a membrane has the mechanical stability to prevent shorts on rough handling, the chemical stability to prevent decomposition reactions that organic liquid electrolytes are prone to suffer at elevated temperatures, and the ability to resist penetration of lithium dendrites [13]. In the literature, there are only a few studies similar to the work that has been carried out by several research groups [14][15][16][17][18][19][20][21][22]. For instance, U.S. Patent 5888672 issued to Gustafson and Antonucci [14] disclosure a battery wherein each of the anode, cathode and electrolyte layer is based upon soluble, amorphous and thermoplastic polyimide.…”

Electrochemical performance of LiVPO4F/C composite cathode prepared through amorphous vanadium phosphorus oxide intermediate

“…Recently, LiVPO 4 F [1-10], a polyanion cathode material for lithium-ion batteries first reported by Barker et al in 2003 [1], has received extensive attention and been considered as an alternative to the presently used LiCoO 2 [11,12] and LiMn 2 O 4 [13][14][15]. LiVPO 4 F has a triclinic structure, isostructural with the mineral tavorite LiFePO 4 (OH) [16] and exhibits a theoretical capacity of about 156 mAh g −1 , close to that of the intensively studied LiFePO 4 (170 mAh g −1 ), and a sole discharge voltage plateau of about 4.2 V vs. Li + /Li, which is higher than that of LiFePO 4 (3.5 V) and LiCoO 2 (3.9 V).…”