Stabilizing oxygen by high-valance element doping for high-performance Li-rich layered oxides - 文章详情页

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Lithium-rich　layered　oxides　(LLOs)　with　high　energy　density　and　low　cost　are　regarded　as　promising　candidates　for　the　next-generation　cathode　materials　for　lithium-ion　batteries　(LIBs).　However,　there　are　still　some　drawbacks　of　LLOs　such　as　oxygen　instability　and　irreversible　structure　reconstruction,　which　seriously　limit　their　electrochemical　performance　and　practical　applications.　Herein,　the　high-valence　Ta　doping　is　proposed　to　adjust　the　electronic　structures　of　transition　metals,　which　form　strong　Ta-O　bonds　and　reduce　the　covalency　of　Ni-O　bonds,　thereby　stabilizing　the　lattice　oxygen　and　enhancing　the　structural/thermal　stabilities　of　LLOs　during　electrochemical　cycling.　As　a　result,　the　optimized　Ta-doped　LLO　can　deliver　a　capacity　retention　of　80%　and　voltage　decay　of　0.34　mV　cycle−1　after　650　cycles　at　1C.　This　study　enriches　the　fundamental　understanding　of　the　electronic　structure　adjustment　of　LLOs　and　contributes　to　the　optimization　of　LLOs　for　high-energy　LIBs.　©　2023　The　Authors.　Battery　Energy　published　by　Xijing　University　and　John　Wiley　&　Sons　Australia,　Ltd.

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Tantalum compounds Lithium compounds Transition metals Cathodes Nickel compounds Oxygen Electronic structure Lithium-ion batteries

作者机构：

[ 1 ] [Wang, Errui]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 2 ] [Wang, Errui]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 3 ] [Wang, Errui]College of Chemistry and Material Engineering, Anhui Science and Technology University, Bengbu, China
[ 4 ] [Xiao, Dongdong]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
[ 5 ] [Wu, Tianhao]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 6 ] [Wu, Tianhao]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 7 ] [Wang, Boya]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 8 ] [Wang, Boya]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 9 ] [Wang, Yinzhong]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 10 ] [Wang, Yinzhong]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 11 ] [Wu, Lingqiao]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 12 ] [Wu, Lingqiao]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 13 ] [Zhang, Xu]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 14 ] [Zhang, Xu]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China
[ 15 ] [Yu, Haijun]Institute of Advanced Battery Materials and Devices, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
[ 16 ] [Yu, Haijun]Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing, China

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