LiNi0.5Mn1.5O4 spinel cathode using room temperature ionic liquid as electrolyte

Gao, Xuan‐Wen; Feng, Chuanqi; Chou, Shulei; Wang, Jiazhao; Sun, Jiazeng; Forsyth, Maria; MacFarlane, Douglas R.; Liu, Huan

doi:10.1016/j.electacta.2012.10.156

Cited by 38 publications

(28 citation statements)

References 32 publications

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“…The second semicircle in the high-to-medium frequency ascribes to the charge transfer resistance ( R ct ). The inclined line at low-frequency region represents the Warburg impedance ( W s ), which is associated with lithium-ion diffusion in the active material [32,33]. …”

Section: Resultsmentioning

confidence: 99%

MnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery

et al. 2014

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Two α-MnO2 crystals with caddice-clew-like and urchin-like morphologies are prepared by the hydrothermal method, and their structure and electrochemical performance are characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), galvanostatic cell cycling, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The morphology of the MnO2 prepared under acidic condition is urchin-like, while the one prepared under neutral condition is caddice-clew-like. The identical crystalline phase of MnO2 crystals is essential to evaluate the relationship between electrochemical performances and morphologies for lithium-ion battery application. In this study, urchin-like α-MnO2 crystals with compact structure have better electrochemical performance due to the higher specific capacity and lower impedance. We find that the relationship between electrochemical performance and morphology is different when MnO2 material used as electrochemical supercapacitor or as anode of lithium-ion battery. For lithium-ion battery application, urchin-like MnO2 material has better electrochemical performance.

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Section: Resultsmentioning

confidence: 99%

MnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery

et al. 2014

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“…It is comprised of R electrolyte , which describes the resistance between the working and reference electrode, R film , which is the resistance related to the transport of lithium through the electrochemically formed surface film on the cathode, and R ct , which is the charge-transfer resistance of the lithium reaction. It is well known that the diameter of the high frequency range semicircle is related to lithium ion migration resistance through the passivation film (R SEI ), and the medium frequency semicircle corresponds to the charge-transfer resistance (R ct ) in combination with the capacitance terms of C film (capacitance of surface film) and C dl (double layer capacitance)15262728. The impedance results correlate well with the previous results; the increased resistance on LiCoO 2 introduced by the electrochemically formed surface films was not negligible when considering the total cell resistance.…”

Section: Resultsmentioning

confidence: 99%

Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries

Mun

Yim

Park

et al. 2014

Sci Rep

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Room-temperature ionic liquid (RTIL) electrolytes have attracted much attention for use in advanced, safe lithium-ion batteries (LIB) owing to their nonvolatility, high conductivity, and great thermal stability. However, LIBs containing RTIL-electrolytes exhibit poor cyclability because electrochemical side reactions cause problematic surface failures of the cathode. Here, we demonstrate that a thin, homogeneous surface film, which is electrochemically generated on LiCoO2 from an RTIL-electrolyte containing an unsaturated substituent on the cation (1-allyl-1-methylpiperidinium bis(trifluoromethanesulfonyl)imide, AMPip-TFSI), can avert undesired side reactions. The derived surface film comprised of a high amount of organic species from the RTIL cations homogenously covered LiCoO2 with a <25 nm layer and helped suppress unfavorable thermal reactions as well as electrochemical side reactions. The superior performance of the cell containing the AMPip-TFSI electrolyte was further elucidated by surface, electrochemical, and thermal analyses.

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“…Gao et al used LiTFSI salt with an ammonium based ionic liquid to successfully cycle Li/LMNO half-cell. 38 The use of additives is also a common approach; in some cases ionic liquids were shown to improve cyclability of LMNO.…”

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Physical and Electrochemical Properties of Some Phosphonium-Based Ionic Liquids and the Performance of Their Electrolytes in Lithium-Ion Batteries

Salem

Zavorine

Nucciarone

et al. 2017

J. Electrochem. Soc.

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In this work, three ionic liquids with two different cations and two different anions: trimethyl propyl phosphonium bis-fluorosulfonyl imide (P 1113 FSI), trimethyl isobutyl phosphonium bis-fluorosulfonyl imide (P 111i4 FSI) and trimethyl isobutyl phosphonium bistrifluoromethylsulfonyl imide (P 111i4 TFSI) have been characterized and evaluated as electrolytes in lithium ion half-cells. It is found that ionic liquids with FSI − anion have superior properties over their TFSI − counterparts and those with the smaller cation, P 1113 , have better conductivity and viscosity. The two ionic liquids with FSI anion, P 1113 FSI and P 111i4 FSI, are liquid at room temperature and show high conductivities and low viscosities, reaching 10.0 mS/cm and 30 cP at room temperature for P 1113 FSI. They also exhibit electrochemical windows higher than 5 V and thermal stability exceeding 300 • C. Mixing the ionic liquids with 0.5 M LiPF 6 increases viscosities, lowers conductivities but improves electrochemical cathodic stability. The electrolyte mixtures have been evaluated in graphite/Li half cells, Li/LiFePO 4 and Li/LiMn 1.5 Ni 0.5 O 4 at C/12 for 100 cycles and at different rates: C/6, C/3, C and 2C for rate capabilities. Battery testing shows that unlike their TFSI − counterparts both ionic liquids with FSI − anion perform well with graphite anode and LiFePO 4 cathode but fail with the higher voltage LiMn Li-ion batteries have attracted a lot of attention since their successful application in portable consumer electronics mainly because of their unique properties such as high energy density and long cycle life. Since then, and due to increased market demand, interest has been drawn toward investigating Li-ion batteries as candidates for use in more energy-demanding applications such as electric vehicles (EV, HEV, PHEV) and large energy storage systems for the electrical grid.1-5 One important aspect of such investigation is to develop new and improved materials for Li-ion batteries to enhance their properties in terms of safety and performance, which is crucial to match the new demand. There have been a large number of studies on the anode, cathode and electrolyte components of Li-ion batteries for this purpose in recent years. Electrolyte solutions used in Li-ion batteries are usually composed of a lithium salt (LiPF 6 ) dissolved in a mixture of two or more carbonate solvents such as ethylene carbonate (EC) and dimethyl carbonate (DMC).6 These solvents are known to have safety concerns due to their flammability, volatility and reactivity to other battery components prompting an increased effort on finding safer alternatives. 7 In the last decade, a group of compounds called ionic liquids (ILs), has been of interest as an alternative to conventional battery electrolytes due to their excellent thermal and physiochemical properties such as non-flammability, negligible vapor pressure, good dissolution power, good electrochemical stability, wide liquid range and intrinsic ionic conductivity.7-13 Despite these aforementioned prope...

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LiNi0.5Mn1.5O4 spinel cathode using room temperature ionic liquid as electrolyte

Cited by 38 publications

References 32 publications

MnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery

MnO2 prepared by hydrothermal method and electrochemical performance as anode for lithium-ion battery

Allylic ionic liquid electrolyte-assisted electrochemical surface passivation of LiCoO2 for advanced, safe lithium-ion batteries

Physical and Electrochemical Properties of Some Phosphonium-Based Ionic Liquids and the Performance of Their Electrolytes in Lithium-Ion Batteries

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