Formulating long-cycle and high-rate lithium-rich manganese-based cathodes by surface-modification strategy coupling defectengineeringOA
Triggering the anionic redox reactions at high voltage is an effective approach to boost the capacity of Lirich layered oxides.However,the irreversible lattice oxygen release at high voltage and sluggish ion kinetics remain conundrums.Herein,a surface modifying coupling defect engineering strategy is proposed to improve the reversibility of anionic redox reactions and ion diffusion efficiency in Lirich layered oxides.A LiNbO_(3) surface modification acts as an effective physical barrier to suppress lattice oxygen release,thereby improving cycling stability of Li-rich layered oxide.Furthermore,the oxygen vacancies in the LiNbO_(3) coating enhance the ion transport kinetics,strengthening the rate capability.After 500 cycles,a high capacity retention of 83.3%can be achieved for the obtained cathode materials(the oxygen-deficient LiNbO_(3)-coated Li-rich layered oxide(CV-LLO))at 5 C,much higher than that of the pristine materials(LLO,52.3%).Moreover,CV-LLO delivers a capacity of 169.9 mAh·g^(−1) at 5 C,which was 65.1%of the capacity at 0.2 C,much higher than that of the pristine LLO(85.6 mAh·g^(−1),33.7%).This study provides insights into the construction of Li-rich layered oxide cathode with highly reversible anionic redox reaction and highly cycling stability for Lithium storage.
Yanpeng Liu;Haobo Du;Jianyuan Wang;Ting Liu;Yunxiang Guo;Kun Zhu;Xiaoyi Hou;Shanglong Peng
School of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,ChinaAcademy of Plateau Science and Sustainability,Qinghai Normal University,Xining 810016,ChinaSchool of Materials and Energy,Lanzhou University,Lanzhou 730000,China Key Laboratory of Sensor and Sensing Technology,Institute of Sensing Technology,Gansu Academy of Sciences,Lanzhou 730000,China Academy of Plateau Science and Sustainability,Qinghai Normal University,Xining 810016,China
信息技术与安全科学
lithium ion batteriesLi-rich layered oxidesLiNbO_(3)coatingoxygen vacanciessurface modification
《Nano Research》 2026 (2)
P.462-469,8
supported by Gansu Academy of Sciences Major Project(No.2024ZDZX-01)Strategic Research and Consultancy Project 2024(No.2024-GS-XZ-01)Gansu Outstanding Doctoral Student Programme(No.24JRRA476)the Open Subject for Key Laboratory of Solar Energy Utilization in Gansu Province in 2024(No.2024-006)Applied Research and Development Project of Gansu Academy of Sciences(No.2021JK-03).
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