Ionic conductivity, lithium insertion and extraction of lanthanum lithium titanate.
The lithium ionic conductivity and electrochemical stability of perovskite La{sub 2/3-x}Li{sub 3x}TiO{sub 3} (LLTO) have been determined with AC impedance spectroscopy, cyclic voltammetry and galvanostatic cycling. Ionic conductivity of La{sub 0.55}Li{sub 0.35}TiO{sub 3} and La{sub 0.57}Li{sub 0.29}TiO{sub 3} pellets sintered from four different powders was measured in the temperature range from 30 to 110 C. Bulk conductivity was found to be closely related to the calcination temperature of the powders. Pellets from 1100 C-calcined powders had higher bulk conductivity than from 1200 C-calcined powders. The grain-boundary conductivity was mainly determined by the sample composition. The activation energies were 0.14-0.18 eV for bulk conduction and 0.41-0.43 eV for grain-boundary conduction. Lithium was intercalated into LLTO below about 1.8 V vs. Li. With addition of acetylene black, about 0.48 Li was reversibly inserted into and extracted out of La{sub 0.55}Li{sub 0.35}TiO{sub 3}. A phase transition is proposed to take place during the lithium insertion.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 949239
- Report Number(s):
- ANL/CMT/JA-38968; SSIOD3; TRN: US201012%%2
- Journal Information:
- Solid State Ionics, Vol. 144, Issue 1-2 ; Sep. 2001; ISSN 0167-2738
- Country of Publication:
- United States
- Language:
- ENGLISH
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