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Phase engineering of Ni-Mn binary layered oxide cathodes for sodium-ion batteries

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Nickel-manganese binary layered oxides with high working potential and low cost are potential candi-dates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Diverse composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for NaxNi0.25Mn0.75O2(0.45 ≤ x ≤ 1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/O3,and P2/P3/O3-NaxNi0.25Mn0.75O2.Among them,P2/P3-Na0.75Ni0.25Mn0.75O2 exhibits the best rate capability of 90.9 mA h g-1 at 5 C,with an initial discharge capacity of 142.62 mA h g-1 at 0.1 C and a capacity retention rate of 78.25％after 100 cycles at 1 C in the voltage range of 2-4.3 V.The observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na+transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 phases.The systematic research and exploration of phases in NaxNi0.25Mn0.75O2 provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.

Phase engineeringNi-Mn layered oxideCathodeSodium-ion batteries

Feifei Hong、Xin Zhou、Xiaohong Liu、Guilin Feng、Heng Zhang、Weifeng Fan、Bin Zhang、Meihua Zuo、Wangyan Xing、Ping Zhang、Hua Yan、Wei Xiang

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College of Materials and Chemistry & Chemical Engineering,Chengdu University of Technology,Chengdu 610059,Sichuan,China

College of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China

Research Institute for Electronic Science(RIES)and Division of Information Science and Technology,Graduate School of Information Science and Technology,Hokkaido University,N20W10,Sapporo,Hokkaido 001-0020,Japan

School of Materials Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China

Yibin Libode New Materials Co.,Ltd.,Yibin 644200,Sichuan,China

Engineering Research Center of the Ministry of Education for Advanced Battery Materials,School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China

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国家自然科学基金四川省科技计划四川省科技计划四川省科技计划Yibin Science and Technology Programproject funded by the China Postdoctoral Science Foundation

218050182022ZHCG00182023NSFSC01172023ZHCG00602022JB0052022M722704

2024

10.1016/j.jechem.2024.01.025

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.91(4)
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