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Herein, a new strategy is proposed wherein late 3d transition metals (TMs) are substituted into a perovskite Li\u2010ion conductor to transform it into a Li\u2010containing MIEC. First\u2010principles calculations show that perovskite Li\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    La\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    MO\n                    <jats:sub>3<\/jats:sub>\n                    with late 3d TMs have a low oxygen vacancy formation energy, implying high electron carrier concentrations corresponding to high electronic conductivity. The activation barriers for Li diffusion in Li\n                    <jats:italic>\n                      <jats:sub>x<\/jats:sub>\n                    <\/jats:italic>\n                    La\n                    <jats:italic>\n                      <jats:sub>y<\/jats:sub>\n                    <\/jats:italic>\n                    MO\n                    <jats:sub>3<\/jats:sub>\n                    (M = Ti, Cr, Mn, Fe, and Co) are below 0.411 eV, resulting in high Li\u2010ion conductivity. The designed perovskites of Li\n                    <jats:sub>0.34<\/jats:sub>\n                    La\n                    <jats:sub>0.55<\/jats:sub>\n                    MnO\n                    <jats:sub>3\u2212<\/jats:sub>\n                    <jats:italic>\n                      <jats:sub>\u03b4<\/jats:sub>\n                    <\/jats:italic>\n                    experimentally prove to have high electronic (2.04 \u00d7 10\n                    <jats:sup>\u22123<\/jats:sup>\n                    S cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and Li\u2010ion (8.53 \u00d7 10\n                    <jats:sup>\u22125<\/jats:sup>\n                    S cm\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) conductivities, and when applied in a carbon\u2010free cathode of a Li\u2013air cell, they deliver superior reversibility at 0.21 mAh cm\n                    <jats:sup>\u22122<\/jats:sup>\n                    over 100 charge\/discharge cycles while avoiding the degradation associated with carbonaceous materials. This strategy enables the effective design of Li\u2010conducting MIEC and reversible Li\u2013air batteries.\n                  <\/jats:p>","DOI":"10.1002\/aenm.202001767","type":"journal-article","created":{"date-parts":[[2020,8,6]],"date-time":"2020-08-06T20:09:14Z","timestamp":1596744554000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Mixed Ionic\u2013Electronic Conductor of Perovskite Li\n                    <i>\n                      <sub>x<\/sub>\n                    <\/i>\n                    La\n                    <i>\n                      <sub>y<\/sub>\n                    <\/i>\n                    MO\n                    <sub>3\u2212<\/sub>\n                    <i>\n                      <sub>\u03b4<\/sub>\n                    <\/i>\n                    toward Carbon\u2010Free Cathode for Reversible Lithium\u2013Air Batteries"],"prefix":"10.1002","volume":"10","author":[{"given":"Sang Bok","family":"Ma","sequence":"first","affiliation":[{"name":"Samsung Advanced Institute of Technology Samsung Electronics  Suwon Gyeonggi\u2010do 16678 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyuk Jae","family":"Kwon","sequence":"additional","affiliation":[{"name":"Samsung Advanced Institute of Technology Samsung Electronics  Suwon Gyeonggi\u2010do 16678 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mokwon","family":"Kim","sequence":"additional","affiliation":[{"name":"Samsung Advanced Institute of Technology Samsung Electronics  Suwon Gyeonggi\u2010do 16678 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seong\u2010Min","family":"Bak","sequence":"additional","affiliation":[{"name":"Chemistry Division Brookhaven National Laboratory  Upton NY 11973 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hyunpyo","family":"Lee","sequence":"additional","affiliation":[{"name":"Samsung Advanced Institute of Technology Samsung Electronics  Suwon Gyeonggi\u2010do 16678 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven N.","family":"Ehrlich","sequence":"additional","affiliation":[{"name":"National Synchrotron Light Source II Brookhaven National Laboratory  Upton NY 11973 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeong\u2010Ju","family":"Cho","sequence":"additional","affiliation":[{"name":"Advanced Materials Lab Samsung Research America  Burlington MA 01803 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongmin","family":"Im","sequence":"additional","affiliation":[{"name":"Samsung Advanced Institute of Technology Samsung Electronics  Suwon Gyeonggi\u2010do 16678 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7200-7186","authenticated-orcid":false,"given":"Dong\u2010Hwa","family":"Seo","sequence":"additional","affiliation":[{"name":"Advanced Materials Lab Samsung Research America  Burlington MA 01803 USA"},{"name":"School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST)  Ulsan 44919 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,8,6]]},"reference":[{"key":"e_1_2_7_1_1","doi-asserted-by":"publisher","DOI":"10.1149\/1.1836378"},{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja056811q"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.mattod.2013.12.004"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/acsaem.9b01727"},{"key":"e_1_2_7_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpowsour.2014.04.096"},{"key":"e_1_2_7_6_1","doi-asserted-by":"publisher","DOI":"10.1039\/C3CC48207C"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/jz3017842"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja2021747"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/jz200352v"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpowsour.2012.05.021"},{"key":"e_1_2_7_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ssi.2016.03.003"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5EE01604E"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/C8TA10771H"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/0038-1098(93)90841-A"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.54.17431"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.54.15299"},{"key":"e_1_2_7_17_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1151-2916.1982.tb10485.x"},{"key":"e_1_2_7_18_1","first-page":"205","volume":"28","author":"Reichmann K.","year":"1998","journal-title":"Inform. 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