3D Structure of Electrode with Inorganic Solid Electrolyte

Zheng, Zhangfeng; Wang, Yan

doi:10.1149/2.072208jes

Cited by 8 publications

(9 citation statements)

References 34 publications

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“…In this work the resultant amorphous film was annealed at 600 • C, a relative low temperature, and the XRD result showed that the thin film remained amorphous, consistent with our previous study. 26 Ionic conductivity of amorphous LLTO thin films.-Ionic conductivity was assessed by employing electrochemical impedance spectroscopy on amorphous LLTO thin films with a thickness of ∼0.30 μm (see Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…22,23 In contrast with crystalline LLTO, amorphous LLTO z E-mail: yanwang@wpi.edu does not display the instability of its crystalline counterpart while still maintaining high lithium ion conductivity. [24][25][26] Li metal can be used as anode. 27 Among all possible anode materials, Li metal is the most attractive because of its favorable thermodynamic electrode potential and high specific capacity.…”

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confidence: 99%

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Amorphous LiLaTiO₃as Solid Electrolyte Material

Zheng

Fang

Liu

et al. 2014

J. Electrochem. Soc.

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Amorphous lithium lanthanum titanate (LLTO) thin films were successfully prepared by a sol-gel method with an all-alkoxide based route. The thin film resistance was determined from the complex spectra by fitting experimental data to the equivalent circuit. The ionic conductivities of amorphous LLTO thin films were 4. 5 × 10 −6 , 6.9 × 10 −6 , 1.3 × 10 −5 , and 3.8 × 10 −5 S/cm at 30 • C, 50 • C, 70 • C, and 90 • C, respectively. The activation energy of lithium ion conduction in the thin film was evaluated to be 0.36 eV in the temperature range of 30-90 • C. The structure of amorphous LLTO was predicted by the ab-initio molecular dynamics (AIMD) simulations and analyzed by partial pair distribution functions, coordination numbers and Voronoi tessellation. It is observed that the local environment of Ti in amorphous LLTO is quite similar to that in the crystal state but the atomic packing is much less dense. The ionic diffusivities were derived from the mean square displacement curves and the conductivities were evaluated from the Nernst-Einstein's relation, showing good agreement with experimental data. The good ionic conductivity of amorphous LLTO is attributed to its open and disordered structure with large excessive volumes.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Amorphous LiLaTiO₃as Solid Electrolyte Material

Zheng

Fang

Liu

et al. 2014

J. Electrochem. Soc.

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“…The preparation is described in detail elsewhere. 22 These as-prepared powders were analyzed with X-ray Diffraction. In order to obtain amorphous LLTO, the annealing temperature was 600 • C. For crystalline one, the temperature was 1100 • C.…”

Section: Methodsmentioning

confidence: 99%

A Fundamental Stability Study for Amorphous LiLaTiO₃Solid Electrolyte

Zheng

Fang

Liu

et al. 2014

J. Electrochem. Soc.

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In this study, amorphous lithium lanthanum titanate (LLTO) powders were prepared by a sol-gel method with an all alkoxide based route. Results showed that unlike its crystalline counterpart which turns into an electronic conductor in direct contact with lithium metal, amorphous LLTO remains to be an ionic conductor and hence is compatible with lithium metal as solid electrolyte although it also undergoes lithium insertion and the consequent reduction of Ti 4+ to Ti 3+ . This striking difference between crystalline and amorphous LLTO could be ascribed to the atomic configuration difference, ordered versus disordered. The electronic states of a disordered system could be localized. It was found that the transference number of lithium ions of amorphous LLTO is over 82%. Our results on electrochemical measurements indicated that amorphous LLTO is stable with blocking electrodes up to 12 V, which can potentially be used with high voltage cathode materials.

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“…The formation of solid lithium electrolyte and electrode material composite was sometimes used in solid-state LIBs to improve the performance by reducing the charge-transfer polarization resistance. − Previously, we proposed a new concept for improving the rate capability and cycling stability of Li 4 Ti 5 O 12 anode by forming micrometer-sized solid lithium electrolyte–Li 4 Ti 5 O 12 nanocomposite . The in situ formed Li 3 x La 2/3– x TiO 3 (LLTO) solid lithium electrolyte could improve the apparent lithium conductivity of the electrode material, thus effectively reducing the polarization resistance at fast rate, consequently improving the rate performance, while the formation of the composite could reduce the contact surface area between the Li 4 Ti 5 O 12 electrode and liquid electrolyte, thus improving the cycling stability.…”

Section: Introductionmentioning

confidence: 99%

Facile Conversion of Commercial Coarse-Type LiCoO₂ to Nanocomposite-Separated Nanolayer Architectures as a Way for Electrode Performance Enhancement

Zhao

Sha

Lin

et al. 2015

ACS Appl. Mater. Interfaces

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Coarse-type LiCoO2 is the state-of-the-art cathode material in small-scale lithium-ion batteries (LIBs); however, poor rate performance and cycling stability limit its large-scale applications. Here we report the modification of coarse-type LiCoO2 (LCO) with nanosized lithium lanthanum titanate (Li3xLa2/3-xTiO3, LLTO) through a facile sol-gel process, the electrochemical performance of commercial LiCoO2 is improved effectively, in particular at high rates. The crystalline structure of pristine LiCoO2 is not affected by the introduction of the LLTO phase, while nanosized LLTO particles are likely incorporated into the space of the LiCoO2 layers to form a LCO-LLTO nanocomposite, which separate the LCO layers with the increase of layer spacing to ∼100 nm. The LLTO incorporation through the facile post-treatment effectively reduces the charge-transfer resistance and increases the electrode reactions; consequently, the LLTO-incorporated LCO electrode shows higher capacity than LiCoO2 at a higher rate and prolonging cycling stability in both potential ranges of 2.7-4.2 V and 2.7-4.5 V, making it also suitable for high-rate operation. This novel concept is general, which may also be applicable to other electrode materials. It thus introduces a new way for the development of high rate-performance electrodes for LIBs for large scale applications such as electric vehicles and electrochemical energy storage for smart grids.

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3D Structure of Electrode with Inorganic Solid Electrolyte

Cited by 8 publications

References 34 publications

Amorphous LiLaTiO₃as Solid Electrolyte Material

Amorphous LiLaTiO₃as Solid Electrolyte Material

A Fundamental Stability Study for Amorphous LiLaTiO₃Solid Electrolyte

Facile Conversion of Commercial Coarse-Type LiCoO₂ to Nanocomposite-Separated Nanolayer Architectures as a Way for Electrode Performance Enhancement

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3D Structure of Electrode with Inorganic Solid Electrolyte

Cited by 8 publications

References 34 publications

Amorphous LiLaTiO3as Solid Electrolyte Material

Amorphous LiLaTiO3as Solid Electrolyte Material

A Fundamental Stability Study for Amorphous LiLaTiO3Solid Electrolyte

Facile Conversion of Commercial Coarse-Type LiCoO2 to Nanocomposite-Separated Nanolayer Architectures as a Way for Electrode Performance Enhancement

Contact Info

Product

Resources

About

Amorphous LiLaTiO₃as Solid Electrolyte Material

Amorphous LiLaTiO₃as Solid Electrolyte Material

A Fundamental Stability Study for Amorphous LiLaTiO₃Solid Electrolyte

Facile Conversion of Commercial Coarse-Type LiCoO₂ to Nanocomposite-Separated Nanolayer Architectures as a Way for Electrode Performance Enhancement