scholarly journals Study of lithium-conducting ceramics Li1.3Al0.3Ti1.7(PO4)3 with the nasicon structure

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 30-35
Author(s):  
I. V. Bocharova ◽  
◽  
G. B. Kunshina ◽  
Keyword(s):  
Liquid Phase ◽  
Solid Electrolyte ◽  
Room Temperature ◽  
Single Phase ◽  
Electronic Conductivity ◽  
Ion Transfer ◽  
Nasicon Structure ◽  
Transfer Number ◽  
Phase Precursor ◽  
Li Ion

NASICON-type Li1.3Al0.3Ti1.7(PO4)3 ceramics with a high-density was obtained from powders synthesized from a liquid-phase precursor. The technological scheme of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte production is given. It is established that at 800 °C a single-phase well-crystallized Li1.3Al0.3Ti1.7(PO4)3 is formed. The ionic conductivity of the sintered Li1.3Al0.3Ti1.7(PO4)3 tablets (density 88–90 %) was 1,9·10–4 S/cm at room temperature, and the electronic conductivity did not exceed 5·10–10 S/cm. The Li+ ion transfer number, measured by potentiostatic chronoamperometry, was 0.99, indicating that the solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 is a purely ionic conductor.

scholarly journals Fast Li-Ion Conduction in Spinel-Structured Solids

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2625
Author(s):  
Jan L. Allen ◽  
Bria A. Crear ◽  
Rishav Choudhury ◽  
Michael J. Wang ◽  
Dat T. Tran ◽  
...  
Keyword(s):  
Solid Solution ◽  
Single Phase ◽  
Electronic Conductivity ◽  
Phase Interface ◽  
Ion Conductivity ◽  
Ion Conduction ◽  
Solid Electrode ◽  
Electrochemically Active ◽  
Li Ion ◽  
Multi Phase

Spinel-structured solids were studied to understand if fast Li+ ion conduction can be achieved with Li occupying multiple crystallographic sites of the structure to form a “Li-stuffed” spinel, and if the concept is applicable to prepare a high mixed electronic-ionic conductive, electrochemically active solid solution of the Li+ stuffed spinel with spinel-structured Li-ion battery electrodes. This could enable a single-phase fully solid electrode eliminating multi-phase interface incompatibility and impedance commonly observed in multi-phase solid electrolyte–cathode composites. Materials of composition Li1.25M(III)0.25TiO4, M(III) = Cr or Al were prepared through solid-state methods. The room-temperature bulk Li+-ion conductivity is 1.63 × 10−4 S cm−1 for the composition Li1.25Cr0.25Ti1.5O4. Addition of Li3BO3 (LBO) increases ionic and electronic conductivity reaching a bulk Li+ ion conductivity averaging 6.8 × 10−4 S cm−1, a total Li-ion conductivity averaging 4.2 × 10−4 S cm−1, and electronic conductivity averaging 3.8 × 10−4 S cm−1 for the composition Li1.25Cr0.25Ti1.5O4 with 1 wt. % LBO. An electrochemically active solid solution of Li1.25Cr0.25Mn1.5O4 and LiNi0.5Mn1.5O4 was prepared. This work proves that Li-stuffed spinels can achieve fast Li-ion conduction and that the concept is potentially useful to enable a single-phase fully solid electrode without interphase impedance.

Elevated Electrochemical Performance of LiNi0.1Mg0.1Co0.8O2 and LiFePO4 Cathodes with Tris(2,2,2-trifluoroethyl) Phosphite as an Efficient Electrolyte Additive

2021 ◽  
Vol 21 (12) ◽  
pp. 6227-6233
Author(s):  
S. Arockia Shyamala Paniyarasi ◽  
S. Padmaja ◽  
M. Pushpa Selvi ◽  
R. M. Gnanamuthu ◽  
R. Nimma Elizabeth
Keyword(s):  
Cathode Materials ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Electronic Conductivity ◽  
Irreversible Capacity ◽  
Electrolyte Additive ◽  
Lithium Diffusion ◽  
Nyquist Plots ◽  
Li Ion

The significant role of Tris(2,2,2-trifluoroethyl) phosphite (TTFP) as an efficient additive during cycling of the layered nanostructured LiNi0.1Mg0.1Co0.8O2 and olivine LiFePO4 cathode materials in EC/DMC and 1M LiPF6 electrolyte for Li-ion battery are extensively investigated in this work. The electrochemical characterization techniques such as cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy show that TTFP improves cycling stability and reduces the irreversible capacity of LiNi0.1Mg0.1Co0.8O2 and LiFePO4 electrodes. Also, the presence of TTFP in electrolyte solution reduces the impedance in LiNi0.1Mg0.1Co0.8O2 and LiFePO4 cathode materials at room temperature. A family of Nyquist plots was obtained from LiNi0.1Mg0.1Co0.8O2 and LiFePO4 electrodes for various potentials during the course of charging. The addition of TTFP in the electrolyte reduces the surface impedance of lithiated LiNi0.1Mg0.1Co0.8O2 and LiFePO4 which can be attributed to the reaction of the additive on the electrode’s surface. Also, the presence of the additive TTFP in LiNi0.1Mg0.1Co0.8O2 and LiFePO4 cell enhances the lithium diffusion rate and improves the electronic conductivity of the cathode material.

High Li-ion conductivity of Al-free Li7-3xGaxLa3Zr2O12 solid electrolyte prepared by liquid-phase sintering

2019 ◽  
Vol 23 (4) ◽  
pp. 1249-1256 ◽  
Author(s):  
Maoyi Yi ◽  
Tao Liu ◽  
Jingyun Li ◽  
Cheng Wang ◽  
Yangcheng Mo ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Solid Electrolyte ◽  
Liquid Phase Sintering ◽  
Ion Conductivity ◽  
Li Ion

Li1.2Zr1.9Ca0.1(PO4)3, a room-temperature Li-ion solid electrolyte

2011 ◽  
Vol 196 (18) ◽  
pp. 7760-7762 ◽  
Author(s):  
Hui Xie ◽  
John B. Goodenough ◽  
Yutao Li
Keyword(s):  
Solid Electrolyte ◽  
Room Temperature ◽  
Li Ion
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