Investigation into Lithium-Ion Conductivity and Redox Stability of Selenium-Doped Lithium Lanthanum Titanate
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hu-lhu2718-sb-meche-2023-thesis.pdf
Description
Thesis PDF
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1.59 MB
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Adobe PDF
Checksum (MD5)
16d1c0e5e3aa7750f52cb2afbac6a5be
Author(s)
Hu, Lambert
Advisor(s)
Shao-Horn, Yang
Date Issued
June 2023
Publisher
Massachusetts Institute of Technology
Abstract
Selenium-doped lithium lanthanum titanate of composition Li₀.₃₃La₀.₅₆Ti₁₋ₓSeₓO3 (x = 0, 0.025, 0.050, 0.075) was attempted using a two-step conventional synthesis process to investigate the potential of the material as a solid-state electrolyte in lithium-ion batteries. Impedance spectroscopy data yielded a maximum room temperature bulk conductivity of (1.73 ± 0.10) x 10⁻³ S cm⁻¹ (EBulk = 0.35 ± 0.03 eV) and grain boundary conductivity of (1.20 ± 0.10) x 10⁻⁴ S cm⁻¹ (EGB = 0.37 ± 0.01 eV) for nominal composition x = 0.050. Preliminary stability measurements through three-electrode cyclic voltammetry suggests potential for LLTO stabilization against Li metal anode through further selenium substitution. However, further work is required to confirm the exact elemental composition of selenium-doped samples.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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