Mitigating the P2–O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction
P2-type Na2/3Ni1/3Mn2/3O2 is one of the most promising cathode candidates for sodium-ion batteries due to its high specific capacity and high working voltage. However, a detrimental P2–O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propos...
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Veröffentlicht in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-01, Vol.9 (17), p.10803-10811 |
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creator | Mao, Qianjiang Yang, Yu Wang, Junkai Zheng, Lirong Wang, Zhenya Qiu, Yunsheng Hao, Yongmei Liu, Xiangfeng |
description | P2-type Na2/3Ni1/3Mn2/3O2 is one of the most promising cathode candidates for sodium-ion batteries due to its high specific capacity and high working voltage. However, a detrimental P2–O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propose to mitigate this critical issue through a controlled F−/Ca2+ dual-doping strategy with CaF2 as a dopant. The divalent Ca2+ ion doped in the Na layer stabilizes the layered structure at a high voltage when excessive Na+ is extracted. The more electronegative F− ion forms a stronger transition metal (TM)–F bond and reduces the electrostatic repulsion between the oxygen layers impeding the gliding of TMO2 layers. The Ca2+/F− co-doping successfully suppresses the unfavorable P2–O2 phase transition, and significantly improves the structural stability and cycling performance (27.1% vs. 87.2% after 500 cycles at 1C). Furthermore, density functional theory calculations combined with experimental tests reveal that the incorporation of Ca2+ and F− in Na sites and O sites facilitates the electronic and ionic conductivity owing to Na+/vacancy disordering, which enhances the high-rate capability. This study provides some insights into the design of long-life and high-rate cathode materials for sodium-ion batteries. |
doi_str_mv | 10.1039/d1ta01433a |
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However, a detrimental P2–O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propose to mitigate this critical issue through a controlled F−/Ca2+ dual-doping strategy with CaF2 as a dopant. The divalent Ca2+ ion doped in the Na layer stabilizes the layered structure at a high voltage when excessive Na+ is extracted. The more electronegative F− ion forms a stronger transition metal (TM)–F bond and reduces the electrostatic repulsion between the oxygen layers impeding the gliding of TMO2 layers. The Ca2+/F− co-doping successfully suppresses the unfavorable P2–O2 phase transition, and significantly improves the structural stability and cycling performance (27.1% vs. 87.2% after 500 cycles at 1C). Furthermore, density functional theory calculations combined with experimental tests reveal that the incorporation of Ca2+ and F− in Na sites and O sites facilitates the electronic and ionic conductivity owing to Na+/vacancy disordering, which enhances the high-rate capability. This study provides some insights into the design of long-life and high-rate cathode materials for sodium-ion batteries.</description><identifier>ISSN: 2050-7488</identifier><identifier>EISSN: 2050-7496</identifier><identifier>DOI: 10.1039/d1ta01433a</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Batteries ; Calcium ; Calcium ions ; Cathodes ; Control stability ; Density functional theory ; Doping ; Electrode materials ; Electronegativity ; Gliding ; High voltage ; High voltages ; Ion currents ; Phase transitions ; Rechargeable batteries ; Sodium ; Sodium channels (voltage-gated) ; Sodium-ion batteries ; Specific capacity ; Structural stability ; Transition metals ; Vacancies</subject><ispartof>Journal of materials chemistry. 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A, Materials for energy and sustainability</title><description>P2-type Na2/3Ni1/3Mn2/3O2 is one of the most promising cathode candidates for sodium-ion batteries due to its high specific capacity and high working voltage. However, a detrimental P2–O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propose to mitigate this critical issue through a controlled F−/Ca2+ dual-doping strategy with CaF2 as a dopant. The divalent Ca2+ ion doped in the Na layer stabilizes the layered structure at a high voltage when excessive Na+ is extracted. The more electronegative F− ion forms a stronger transition metal (TM)–F bond and reduces the electrostatic repulsion between the oxygen layers impeding the gliding of TMO2 layers. The Ca2+/F− co-doping successfully suppresses the unfavorable P2–O2 phase transition, and significantly improves the structural stability and cycling performance (27.1% vs. 87.2% after 500 cycles at 1C). Furthermore, density functional theory calculations combined with experimental tests reveal that the incorporation of Ca2+ and F− in Na sites and O sites facilitates the electronic and ionic conductivity owing to Na+/vacancy disordering, which enhances the high-rate capability. This study provides some insights into the design of long-life and high-rate cathode materials for sodium-ion batteries.</description><subject>Batteries</subject><subject>Calcium</subject><subject>Calcium ions</subject><subject>Cathodes</subject><subject>Control stability</subject><subject>Density functional theory</subject><subject>Doping</subject><subject>Electrode materials</subject><subject>Electronegativity</subject><subject>Gliding</subject><subject>High voltage</subject><subject>High voltages</subject><subject>Ion currents</subject><subject>Phase transitions</subject><subject>Rechargeable batteries</subject><subject>Sodium</subject><subject>Sodium channels (voltage-gated)</subject><subject>Sodium-ion batteries</subject><subject>Specific capacity</subject><subject>Structural stability</subject><subject>Transition metals</subject><subject>Vacancies</subject><issn>2050-7488</issn><issn>2050-7496</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNo9jctOwzAQRS0EElXphi-wxBKF-BUnWaKKl9QHC1hXE3tSUlVOiR1Ed_wDG76PL8EpiNnM1cw99xJyztkVZ7JMLQ_AuJISjshIsIwluSr18b8uilMy8X7D4hSM6bIcka95E5o1hMataXhB-ii-Pz6XgoYOnI-v1lFwli7gMn0DA87sadtZ7AZ_4-JdpHLR8FTOXVQRrPYRiFhq4EDbHraJbXcDULcdrcGHQ6QPUG1xSI5BHrvBneJ7LDaDPCMnNWw9Tv72mDzf3jxN75PZ8u5hej1L1oLrkPBKlaXNs1zX3OQgSmtZlikhgSFAobSqCzAGEIFXDGWl8irnQiqNFRYo5Jhc_Obuuva1Rx9Wm7bvXKxciUxwVWSaZfIHOcxqGg</recordid><startdate>20210101</startdate><enddate>20210101</enddate><creator>Mao, Qianjiang</creator><creator>Yang, Yu</creator><creator>Wang, Junkai</creator><creator>Zheng, Lirong</creator><creator>Wang, Zhenya</creator><creator>Qiu, Yunsheng</creator><creator>Hao, Yongmei</creator><creator>Liu, Xiangfeng</creator><general>Royal Society of Chemistry</general><scope>7SP</scope><scope>7SR</scope><scope>7ST</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>JG9</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>20210101</creationdate><title>Mitigating the P2–O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction</title><author>Mao, Qianjiang ; Yang, Yu ; Wang, Junkai ; Zheng, Lirong ; Wang, Zhenya ; Qiu, Yunsheng ; Hao, Yongmei ; Liu, Xiangfeng</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g216t-1b499d7576f1c7a29dd055423a0eaa8464f8accaeea1b0e3b47b712346ebe8e23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Batteries</topic><topic>Calcium</topic><topic>Calcium ions</topic><topic>Cathodes</topic><topic>Control stability</topic><topic>Density functional theory</topic><topic>Doping</topic><topic>Electrode materials</topic><topic>Electronegativity</topic><topic>Gliding</topic><topic>High voltage</topic><topic>High voltages</topic><topic>Ion currents</topic><topic>Phase transitions</topic><topic>Rechargeable batteries</topic><topic>Sodium</topic><topic>Sodium channels (voltage-gated)</topic><topic>Sodium-ion batteries</topic><topic>Specific capacity</topic><topic>Structural stability</topic><topic>Transition metals</topic><topic>Vacancies</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mao, Qianjiang</creatorcontrib><creatorcontrib>Yang, Yu</creatorcontrib><creatorcontrib>Wang, Junkai</creatorcontrib><creatorcontrib>Zheng, Lirong</creatorcontrib><creatorcontrib>Wang, Zhenya</creatorcontrib><creatorcontrib>Qiu, Yunsheng</creatorcontrib><creatorcontrib>Hao, Yongmei</creatorcontrib><creatorcontrib>Liu, Xiangfeng</creatorcontrib><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Environment Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Journal of materials chemistry. A, Materials for energy and sustainability</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mao, Qianjiang</au><au>Yang, Yu</au><au>Wang, Junkai</au><au>Zheng, Lirong</au><au>Wang, Zhenya</au><au>Qiu, Yunsheng</au><au>Hao, Yongmei</au><au>Liu, Xiangfeng</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mitigating the P2–O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction</atitle><jtitle>Journal of materials chemistry. A, Materials for energy and sustainability</jtitle><date>2021-01-01</date><risdate>2021</risdate><volume>9</volume><issue>17</issue><spage>10803</spage><epage>10811</epage><pages>10803-10811</pages><issn>2050-7488</issn><eissn>2050-7496</eissn><abstract>P2-type Na2/3Ni1/3Mn2/3O2 is one of the most promising cathode candidates for sodium-ion batteries due to its high specific capacity and high working voltage. However, a detrimental P2–O2 phase transition usually occurs at a high voltage (>4.2 V) leading to poor cycle stability. Herein, we propose to mitigate this critical issue through a controlled F−/Ca2+ dual-doping strategy with CaF2 as a dopant. The divalent Ca2+ ion doped in the Na layer stabilizes the layered structure at a high voltage when excessive Na+ is extracted. The more electronegative F− ion forms a stronger transition metal (TM)–F bond and reduces the electrostatic repulsion between the oxygen layers impeding the gliding of TMO2 layers. The Ca2+/F− co-doping successfully suppresses the unfavorable P2–O2 phase transition, and significantly improves the structural stability and cycling performance (27.1% vs. 87.2% after 500 cycles at 1C). Furthermore, density functional theory calculations combined with experimental tests reveal that the incorporation of Ca2+ and F− in Na sites and O sites facilitates the electronic and ionic conductivity owing to Na+/vacancy disordering, which enhances the high-rate capability. This study provides some insights into the design of long-life and high-rate cathode materials for sodium-ion batteries.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><doi>10.1039/d1ta01433a</doi><tpages>9</tpages></addata></record> |
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source | Royal Society Of Chemistry Journals 2008- |
subjects | Batteries Calcium Calcium ions Cathodes Control stability Density functional theory Doping Electrode materials Electronegativity Gliding High voltage High voltages Ion currents Phase transitions Rechargeable batteries Sodium Sodium channels (voltage-gated) Sodium-ion batteries Specific capacity Structural stability Transition metals Vacancies |
title | Mitigating the P2–O2 transition and Na+/vacancy ordering in Na2/3Ni1/3Mn2/3O2 by anion/cation dual-doping for fast and stable Na+ insertion/extraction |
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