The charge-discharge of a graphite Li cell was successful without any org. Its discharge capacity is near the ideal value. Cation mixts. In particular, Li0. This melt is an ionic liq. Its electrochem. The charge-discharge of a Li0. In particular, rate performance and cycle stability with LiFePO4 were superior to an org.
Google Scholar There is no corresponding record for this reference. RTILs based on asym. The m. Relatively low viscosity RTILs based on aliph. A new family of molten salts is reported, based on the N-alkyl, N-alkyl pyrrolidinium cation and the bis trifluoromethanesulfonyl imide anion.
Some of the members of the family are molten at room temp. Of the room-temp. This highly conductive behavior is rationalized in terms of the role of cation planarity. The salts also exhibit multiple cryst. Solid-State Lett. A room-temp. An av. For deposition rates up to 1. Above 1. We report an electrochem. We show that these ionic liq. A prototype of these batteries, having lithium iron phosphate as the cathode, showed good performance in terms of charge-discharge efficiency and rate capability.
A few room temp. Ability for use as an electrolyte base of s lithium battery system was totally explained with the cathodic stability of the salt, however, other properties might also affect this ability. Among the salts studied here, N-methyl-N-propylpiperidinium bis trifluoromethanesulfonyl imide is the most promising candidate as the electrolyte base.
A new group of room temp. Phosphonium ionic liqs. Particularly, phosphonium ionic liqs. Linear sweep voltammetry measured in neat phosphonium ionic liqs. TGA suggested that phosphonium ionic liqs. Girard, G. Electrolytes of a room temp.
We show that the FSI-based electrolyte contg. These electrolytes could compete with the more traditionally studied nitrogen-based ionic liqs.
ILs in lithium battery applications. The lithium ion binary room-temp. The thermal decompn. The capacity retention after 50 cycles was This paper reported studies obtained with the room temp. The thermal stability, viscosity, cond. A soln. Cycling and power measurements were obtained. The results were compared with those obtained with a molten salt formulated with a different anion, tetrafluoroborate BF4- and with a conventional liq.
The room temp. While Li foil initially reacted with both ionic liqs. Highly reversible, safe lithium secondary batteries that use imidazolium-cation-based room-temp. To achieve higher redn. To understand the basic properties of lithium secondary batteries which consist of nonflammable and nonvolatile room-temp.
By using a modified imidazolium cation-based room-temp. Also, an optimal lithium salt concn. Lithium secondary batteries that use a room-temp. The temp. According to the results, the effects of extending the alkyl chain were confirmed in, for example, the increase in carrier ion no. RTILs , and the thermal behavior, d. The self-diffusion coeff. The pulsed-field-gradient spin-echo NMR method reveals a higher self-diffusion coeff. The summation of the cationic and anionic diffusion coeffs.
The ratio of molar cond. The ratio decreases with increasing no. Finally, a balance between the electrostatic and induction forces has been discussed in terms of the main contribution factor in detg. A novel aliph. Its desirable properties include nonflammability, a quite wide potential window 5. The authors attempted to use Li-binary ionic liqs.
To provide a solid electrolyte interface that would overcome the reductive decompn. The selected additives, vinylene carbonate VC and ethylene carbonate EC effectively prevented the decompn. To evaluate the potential of these liqs.
This is the 1st report of the knowledge that a lithium ion cell with an ionic liq. An interaction energy potential calcd. The electrostatic and induction interactions are the major source of the attraction in the two systems. A Li secondary battery with a room-temp. This battery had near the theor. To det. The prepd. Journal of the Electrochemical Society , 12 , AA, 7 pp.
The effect of their cation structure on anode properties of Si electrodes were investigated through the use of thick film prepd. Moreover, a comparatively high capacity of mA h g-1 at a high c. Raman anal. It was suggested that introduction of ether functional group into cation is valid to enhance the electrode performance. As the development of high energy-d. Li-ion batteries moves ahead, ensuring safety of the batteries has become increasingly important. Among the unique physicochem.
The use of ionic liqs. The ether functional group in the PP1MEM cation has the meaningful function; the cation structure reduces the electrostatic interaction between the Li ion and TFSA anions in an ionic liq. The solvation no. The knowledge obtained from this study contributes to the development of next-generation Li-ion batteries having both high energy d.
ILs are ambient temp. These remarkable properties result essentially from their ionic nature. Thus, the concept of ionicity of ILs i. Here, we show the methodologies used to assess the ionic nature in ILs.
On the basis of quant. The ionicity of certain ILs is also predicted from their physicochem. The effects of different classes of ILs e.
Raman spectra of the ionic liq. The lithium ion solvation no. In the neat ionic liq. However, gas phase quantum calcns. In this study, addnl. MP2 level ab initio calcns. The ab initio calcns. The self-diffusion coeffs. At K, the degree of ion dissocn. The diffusion processes in the vicinity of LiCoO2 single particles were also studied using a microelectrode technique.
A comparison of the electrochem. A novel class of low-melting, hydrophobic ionic liqs. The important physicochem. The influence of the structure variation in the quaternary ammonium cation and perfluoroalkyltrifluoroborate [R5BF3]- anion on the above physicochem.
Most of these salts are liqs. The key properties of these salts, namely, phase transitions, thermal stability, d. The structural effect on all the above properties was intensively studied in terms of the identity of the cation and anion, variation of the side chain in the cation i. The redn. Some of these new salts show desirable properties, including low m.
In addn. Preliminary voltage-compn. But similar performance of cells contg. Ambient temp. FSI with the Li cation can prevent such an irreversible reaction and ensure reversible Li intercalation into graphene interlayers.
The exptl. This may be the 1st report that a pure ionic liq. The high viscosity of the ionic liqs. To realize high-safety, high-performance lithium-ion batteries using room-temp. In particular, a bis fluorosulfonyl imide anion based room-temp. By application of electrochem. Saint, J. The possibility of using electrolyte systems based on room-temp. RTILs in Li batteries is discussed. The non-flammability and wide potential windows of RTIL-based systems are attractive advantages which may lead to the development of safer, higher energy d.
An evaluation of the compatibility of these electrolyte systems with candidate electrodes is crit. Strategies to improve performance and minimize cathode dissoln. Ionic liq. Cyclic voltammetry for a graphitized neg. FSI with other anions suggests that the reversibility of Li intercalation correlates with the relative quantity or concn. On the basis of the present results, we discuss the effect of FSI in the ionic systems on a graphitized electrode interface. Balducci, A.
This manuscript presents the work carried out within the European project ILLIBATT, which was dedicated to the development of green, safe and high performance ionic liqs. Different types of ionic liqs. Using these electrolytes, the performance of several anodic and cathodic materials has been tested and promising results have been obtained. Also, electrodes were formulated using water sol.
Using these innovative components, lithium-ion and lithium-metal battery prototypes 0. The results of these tests showed that such ionic liqs. Moreover, safety tests showed that the introduction of these alternative electrolytes pos. Electrochemical Society of Japan. Because of their potentially superior safety characteristics, room temp. However, relatively poor battery performance, which is a consequence of the higher viscosity and lower cond. Amongst various RTILs, those contg.
Here, the electrochem. It is shown that ILs contg. This unusual behavior is ascribed to the concomitant increase in transference no. We evaluate the effects of lithium salt on the charge-discharge performance of a graphite neg.
Although the graphite neg. Furthermore, a clear difference in the low-temp. Considering the low-temp. These results suggest that optimization of the electrolyte compn. We prepd. Activation energies for interfacial lithium ion transfer were evaluated based on the temp.
These higher activation energies for ionic liqs. Charge transfer resistance Rct was clearly obsd. The activation energy was strongly affected by the anion species of ionic liqs.
Besides, cation species also showed some effect on the activation energy. At decreased temp. Anodic electrolyte oxidn. Irreversible structural conversion of the spinel LiMn2O4 in the ionic electrolyte, possibly assocd. A discharge capacity of Decreasing temp.
Mechanism related to the obvious temp. High internal resistance and the resultant large IR drop between the cut-off voltage are dominant factors responsible for the low reversible capacity under low temp. At elevated temp. Phase Diagram of Li x C 6 Phys. B: Condens.
Matter Mater. Several differences were found between our results and previous work. As x increases past 0. It is possible to accurately det. Clear coexisting-phase regions are obsd. The difference between this transition and the others are discussed.
The av. In the ionic electrolyte contg. Mechanisms concerning the significant electrochem. Ac impedance and SEM studies demonstrated the formation of a thin, homogeneous, compact and more conductive SEI layer on the graphite electrode surface. The advantages of the stable charge-discharge behavior provided by FSI-based ionic liqs. Based on these analyses, a mechanism involving a double-layer-based interface not a solid electrolyte interface SEI is proposed to stabilize the surface of graphite neg.
A prototype lithium-ion battery with a bis fluorosulfonyl imide FSI -based ionic liq. The prototype was mounted on a demonstration module of the "Hodoyoshi-3" microsatellite, which was successfully launched on June 20, Qualification tests for space application, including radiation tolerance and vacuum tests, revealed negligible degrdn. According to the flight data, the IL-LIB cell can exist stably in an ultra-high vacuum environment despite its thin and flexible pouch casing without any rigid anti-vacuum reinforcements.
Furthermore, the power unit showed the same charge-discharge performance as that predicted by the charge-discharge behavior of an identical cell on the ground, suggesting that the IL-LIB cell maintains performance in high vacuum a microgravity environment.
As electrolytes for sodium secondary batteries operating over a wide temp. The effects of Na ion concn. Results show that Na ion concn. The operation temp. At operation temps. There exist different optimum ranges of Na ion concn.
The discharge capacities of 92 and mAh g-NaCrO2 -1 were obsd. The cell also showed high discharge rates, reaching mA g-1 at K. Coulombic efficiency was higher than A stable charge-discharge behavior was obtained over the temp. The cell offered nearly a one-electron theor. The rate capability showed considerable enhancement with increasing temp. Explains when is the correct trading conditions, so that you don't lose money and teaches you which systems are better and which may not bring in profit.
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