O3-type layered oxides are considered promising cathode materials for next-generation high-energy-density sodium-ion batteries (SIBs). However, they face challenges, such as low rate capacity and poor cycling stability, which arise from structural deformation, sluggish Na diffusion kinetics, and interfacial side reactions. Herein, a synergistic substitution strategy for transitional and interstitial sites was adopted to improve the structure stability and Na diffusion kinetics of the O3-type NaNiFeMnO. Simulation results indicate that Co/B codoping effectively lowers the Na migration energy barrier. In addition, the synergistic effect of Co/B codoping provides ultralow lattice strain during repeated Na deintercalation/intercalation. In situ characterization verified that the complex phase transformation during charge and discharge was suppressed, thereby significantly improving the structural stability. At 1 and 3 C, the capacity retention of the modified O3-Na(NiFeMn)CoBO (NFMCB) improved from 29.6% and 1.7% to 86.7% and 88.6% after 200 cycles, respectively. Even at 10 C, it could still produce 107.2 mAh·g. Furthermore, full cells assembled with this material and commercial hard carbon exhibit a high energy density of 316.2 Wh·kg and a capacity retention of 80.8% after 200 cycles at 1 C. It is expected that this strategy will facilitate the commercialization of O3-type layered oxides.
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http://dx.doi.org/10.1021/acsami.4c17755 | DOI Listing |
ACS Appl Mater Interfaces
December 2024
Guangxi Key Laboratory of Low-Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
O3-type layered oxides are considered promising cathode materials for next-generation high-energy-density sodium-ion batteries (SIBs). However, they face challenges, such as low rate capacity and poor cycling stability, which arise from structural deformation, sluggish Na diffusion kinetics, and interfacial side reactions. Herein, a synergistic substitution strategy for transitional and interstitial sites was adopted to improve the structure stability and Na diffusion kinetics of the O3-type NaNiFeMnO.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, People's Republic of China.
O3-NaNiFeMnO has attracted much attention as a cathode for sodium-ion batteries, because of its low cost and high sodium-ion storage capacity. However, its slow Na diffusion kinetics and harmful P3-O3' phase transition with severe bulk strain at high voltage leads to poor rate capability and fast capacity fading. Herein, we propose a multivariate doping strategy with Cu, Mg, and Ti ions to solve the above problems of the O3-NaNiFeMnO cathode.
View Article and Find Full Text PDFJ Phys Condens Matter
December 2024
Fuzhou University, Fujian Provincial Key Laboratory of Electrochemical Energy Storage Materials, Fuzhou, Fujian, 350108, CHINA.
Under the background of surging global demand for batteries and scarcity of Li resources, sodium-ion batteries (SIBs) are attracting attention as a potential alternative with their unique advantages, and the layered transition metal oxides therein are considered to be one of the most promising cathode materials. In this paper, firstly, the diversity of cathode materials for sodium-ion batteries is systematically introduced, as well as the layered oxide structures among them are categorized, and then it focuses on the O3-type sodium-rich NaMO, which is promising for large-scale commercial applications, illustrating the development and mechanism of anion redox. Excess Na transforms the transition metal layer into the mixed NaMOlayer, leading to the formation of localized configuration Na-O-Na.
View Article and Find Full Text PDFInorg Chem
December 2024
Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan.
Layered oxides, such as NaMeO (Me = transition metal, = 0-1), are believed to be the most promising positive electrode materials for Na-ion batteries because of their high true density, large capacities, high working potentials, and reversibility. This study identified Na[NiMnFeTi]O as an optimal composition for use as an O3-type positive electrode material in Na-ion batteries on the basis of a comprehensive phase diagram, where the end members of the triangular phase diagram were Na[NiMn]O, Na[NiTi]O, and the hypothetical composition Na[NiFe]O. By investigating the effects of the partial substitution of Mn with Fe and Ti within the Na[NiMnFeTi]O system, we optimized the capacity, working potential, and cycle performance.
View Article and Find Full Text PDFNano Lett
November 2024
School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
The development prospect of layered transition metal oxides in sodium-ion batteries is excellent, but there are some problems, such as poor cycle stability and a complex phase transition. The spherical NaNiFeMnTiSnCoLiO (SP-HEO) has been developed to address the challenges faced by O3-type layered oxide in sodium-ion batteries. The SP-HEO material is synthesized by piling and high entropy.
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