AC conductivity studies of polyethylene oxide-garnet-type Li7La3Zr2O12 hybrid composite solid polymer electrolyte films

Bashiri, Parisa; Rao, T. Prasada; Naik, V. M.; Nazri, G.A.; Naik, R.

doi:10.1016/j.ssi.2019.115089

Cited by 11 publications

(14 citation statements)

References 38 publications

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“…All the films investigated in this work were free-standing and mechanically robust, especially CSPE films with LLZO. As shown in our earlier work, the CSPE films retain their mechanical integrity at high temperatures up to 120 °C [17]. Figure 2 shows the SEM images of PEOnLiClO4 and PEOnLiClO4-LLZO films with different Li-salt content.…”

Section: Resultssupporting

confidence: 61%

“…About 100 µm thickness (t) films of PEO n LiClO 4 and PEO n LiClO 4 -LLZO with n = 10, 12 and 15 were prepared as described in detail elsewhere [17]. All films were desiccated for a day before making structural and electrochemical measurements.…”

Section: Methodsmentioning

confidence: 99%

“…Infrared and Raman spectra of the films showed no solvent characteristic bands implying the absence of residual solvent in the films. Structural characterization (X-ray diffraction and scanning electron microscopy), thermal stability, and electrical impedance of the films in the 1 Hz to 300 kHz range were carried out as described in [17].…”

Section: Methodsmentioning

confidence: 99%

“…Recently, hybrid CSPE films of polyethylene oxide (PEO) complexed with LiClO 4 and filled with sub-micron to micron-sized garnet Li 7 La 3 Zr 2 O1 2 (LLZO) particles have been intensely studied [14][15][16][17]. LLZO is an inorganic garnet-type material that occurs in both tetragonal and cubic crystalline phases, but cubic LLZO is stabilized by doping with Al [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, a study with cubic-LLZO micron-sized particles as a filler in PEO 20 LiClO 4 (PEO Mw = 10 5 ) showed a decrease in conductivity of the composite films with the addition of 30-50 vol% of LLZO [16]. We investigated the AC conductivity of PEO 15 LiClO 4 (PEO Mw = 10 6 ) films containing 50 wt% of cubic-LLZO particles [17]. We observed an enhancement in conductivity (1.4 × 10 −4 S cm −1 at 30 C for the composite solid electrolyte of PEO 8 LiTFSI (PEO Mw = 6 × 10 5 ) containing 10 wt% of garnet Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) micron-sized particles [24].…”

Section: Introductionmentioning

confidence: 99%

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Ionic Conductivity of Hybrid Composite Solid Polymer Electrolytes of PEOnLiClO4-Cubic Li7La3Zr2O12 Films

et al. 2021

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Ionic conductivity of the polyethylene oxide-LiClO4 (PEOnLiClO4) solid polymer electrolyte (SPE) films with an EO:Li ratio (n) of 10, 12, 15, as well as the hybrid composite solid polymer electrolyte (CSPE) films of PEOnLiClO4 containing 50 wt% of cubic-Li7La3Zr2O12 (LLZO) sub-micron sized particles, have been studied by varying Li-salt content in the films. The complex AC dielectric permittivity and conductivity data obtained from electrical impedance measurements were fitted using a generalized power-law, including the effects of electrode polarization applied at low AC frequencies to obtain various relaxation times. In addition to increased mechanical and thermal robustness, the CSPE films show higher values of ionic conductivity, >10−4 S/cm at room temperature compared to those of SPE films with n = 12 and 15. On the contrary, the ionic conductivity of CSPE with n = 10 decreases by a factor of three compared to the corresponding SPE film due to increased polymer structural reorientation and Li-ion pairing effects. The Vogel–Tammann–Fulcher behavior of the temperature-dependent conductivity data indicates a close correlation between the ionic conductivity and polymer segmental relaxation. The PEO12LiClO4-LLZO film shows the lowest activation energy of ~0.05 eV.

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Section: Resultssupporting

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ionic Conductivity of Hybrid Composite Solid Polymer Electrolytes of PEOnLiClO4-Cubic Li7La3Zr2O12 Films

et al. 2021

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Composite Polymer Electrolytes for Lithium Batteries

et al. 2022

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The flexible and less flammable solid polymer electrolytes are attractive candidates for high specific energy density lithium batteries. However, the use of polymer electrolytes in rechargeable batteries for EVs is hindered because of their low lithium‐ion conductivity at room temperature and lithium dendrite formation during lithium deposition at high current density. To improve the room temperature conductivity of polymer electrolytes, composite lithium‐ion conductors consisting of polymer and ionic liquids or inorganic solid lithium ion conductors have been examined over the past two decades. The polymer electrolyte with ionic liquid showed ionic conductivity of more than 10−4 S cm−1 at room temperature, but lithium dendrite‐free composite electrolytes have not yet been reported at room temperature and a high current density. The flexible composite electrolytes of polymers and lithium‐ion conductive solid electrolytes showed high ionic conductivity of more than 2×10−4 S cm−1 and no dendrite short‐circuit was observed at room temperature and 1.0 mA cm−1 for long cycling. The suppression of lithium dendrite formation in the composite electrolyte is due to the formation of a stable interface layer between the lithium electrode and composite electrolyte. At present, no room temperature all‐solid‐state batteries have been developed with performance comparable to conventional lithium‐ion batteries with liquid electrolytes. One of the disadvantage of the lithium batteries with the composite polymer electrolyte is higher mass of the electrolyte than that of a liquid electrolyte with a porous separator. The specific energy density of the batteries depends on the thickness of the electrolyte and the specific area capacity. At present, the thickness of the polymer composite electrolytes is in a range of 50–200 μm. The specific energy density of the lithium battery with a 100 μm thick composite electrolyte is 430 Wh kg−1 at 10 mAh cm−2, which is 1.4 times higher than that of the conventional Li‐ion battery. A high specific area capacity battery with a thin polymer composite electrolyte should be developed to obtain a high energy density battery. We are anxiously expecting a mechanically stable composite polymer electrolyte thin film of less than 100 μm thick with high Li‐ion conductivity more than 10−3 S cm−1 at room temperature and low interface resistance with Li electrode. The addition of small amount of a low molecular weight additive into the composite electrolytes is effective to improve the interface resistance between the lithium electrode and composite electrolyte, which results in no dendrite formation at high current density and room temperature.

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Study of the effect of LiClO4 concentration on the ionic transport of solid polymer electrolyte based on poly(vinyl alcohol)/gum Arabic

Cholant

Rodrigues

Balboni

et al. 2022

Ionics

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AC conductivity studies of polyethylene oxide-garnet-type Li7La3Zr2O12 hybrid composite solid polymer electrolyte films

Cited by 11 publications

References 38 publications

Ionic Conductivity of Hybrid Composite Solid Polymer Electrolytes of PEOnLiClO4-Cubic Li7La3Zr2O12 Films

Ionic Conductivity of Hybrid Composite Solid Polymer Electrolytes of PEOnLiClO4-Cubic Li7La3Zr2O12 Films

Composite Polymer Electrolytes for Lithium Batteries

Study of the effect of LiClO4 concentration on the ionic transport of solid polymer electrolyte based on poly(vinyl alcohol)/gum Arabic

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