Tuning local chemistry of P2 layered-oxide cathode for high energy and long cycles of sodium-ion battery. - 文章详情页

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Layered　transition-metal　oxides　have　attracted　intensive　interest　for　cathode　materials　of　sodium-ion　batteries.　However,　they　are　hindered　by　the　limited　capacity　and　inferior　phase　transition　due　to　the　gliding　of　transition-metal　layers　upon　Na+　extraction　and　insertion　in　the　cathode　materials.　Here,　we　report　that　the　large-sized　K+　is　riveted　in　the　prismatic　Na+　sites　of　P2-Na0.612K0.056MnO2　to　enable　more　thermodynamically　favorable　Na+　vacancies.　The　Mn-O　bonds　are　reinforced　to　reduce　phase　transition　during　charge　and　discharge.　0.901　Na+　per　formula　are　reversibly　extracted　and　inserted,　in　which　only　the　two-phase　transition　of　P2　↔　P＇2　occurs　at　low　voltages.　It　exhibits　the　highest　specific　capacity　of　240.5　mAh　g-1　and　energy　density　of　654　Wh　kg-1　based　on　the　redox　of　Mn3+/Mn4+,　and　a　capacity　retention　of　98.2%　after　100　cycles.　This　investigation　will　shed　lights　on　the　tuneable　chemical　environments　of　transition-metal　oxides　for　advanced　cathode　materials　and　promote　the　development　of　sodium-ion　batteries.

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[ 1 ] [Wang Chenchen]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China
[ 2 ] [Liu Luojia]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China
[ 3 ] [Zhao Shuo]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China
[ 4 ] [Liu Yanchen]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China
[ 5 ] [Yang Yubo]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
[ 6 ] [Yu Haijun]College of Materials Science and Engineering, Beijing University of Technology, Beijing, China
[ 7 ] [Lee Suwon]Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea
[ 8 ] [Lee Gi-Hyeok]Department of Materials Science and Engineering, Dongguk University, Seoul, Republic of Korea
[ 9 ] [Kang Yong-Mook]Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea
[ 10 ] [Liu Rong]Secondary Ion Mass Spectrometry Facility, Western Sydney University, Locked 17 Bag 1797, Penrith, NSW, Australia
[ 11 ] [Li Fujun]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China. fujunli@nankai.edu.cn
[ 12 ] [Chen Jun]Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, China

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