{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/151906"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/151906","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Investigation into Lithium-Ion Conductivity and Redox Stability of Selenium-Doped Lithium Lanthanum Titanate","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.","abstract_html":"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.","abstract_has_math":false,"creators":["Hu, Lambert"],"institution":"Massachusetts Institute of Technology","degree_name":"Bachelor","degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Department of Mechanical Engineering","school":null,"contributors":[],"advisors":["Shao-Horn, Yang"],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-06","date_published":"2023-06","updated_at":"2026-07-22T22:21:16Z","subjects":[],"languages":[],"rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"rights_urls":["https://rightsstatements.org/page/InC-EDU/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1721.1/151906","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Shao-Horn, Yang"]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. 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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."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["S.B."]},{"key":"dc:title","label":"Title","values":["Investigation into Lithium-Ion Conductivity and Redox Stability of Selenium-Doped Lithium Lanthanum Titanate"]}]}],"canonical_facts":{"dc:contributor.advisor":["Shao-Horn, Yang"],"dc:contributor.department":["Massachusetts Institute of Technology. Department of Mechanical Engineering"],"dc:creator":["Hu, Lambert"],"dc:date.accessioned":["2023-08-23T16:18:02Z"],"dc:date.available":["2023-08-23T16:18:02Z"],"dc:date.issued":["2023-06"],"dc:description.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."],"dc:description.degree":["S.B."],"dc:identifier.uri":["https://hdl.handle.net/1721.1/151906"],"dc:publisher":["Massachusetts Institute of Technology"],"dc:rights":["In Copyright - Educational Use Permitted","Copyright retained by author(s)"],"dc:rights.uri":["https://rightsstatements.org/page/InC-EDU/1.0/"],"dc:title":["Investigation into Lithium-Ion Conductivity and Redox Stability of Selenium-Doped Lithium Lanthanum Titanate"],"dc:type":["Thesis"],"thesis:degree_name":["Bachelor","Bachelor of Science in Mechanical Engineering"]},"updated_at":"2026-07-22T22:21:16Z"}