Liang, Xinghui Kim, Hun Jung, Hun-Gi Sun, Yang-Kook 2024-01-19T15:05:04Z 2024-01-19T15:05:04Z 2021-10-21 2021-03 1616-301X https://pubs.kist.re.kr/handle/201004/117308 Sodium manganese oxides as promising cathode materials for sodium-ion batteries (SIBs) have attracted interest owing to their abundant resources and potential low cost. However, their practical application is hindered due to the manganese disproportionation associated with Mn3+, resulting in rapid capacity decline and poor rate capability. Herein, a Li-substituted, tunnel/spinel heterostructured cathode is successfully synthesized for addressing these limitations. The Li dopant acts as a pillar inhibiting unfavorable multiphase transformation, improving the structural reversibility, and sodium storage performance of the cathode. Meanwhile, the tunnel/spinel heterostructure provides 3D Na+ diffusion channels to effectively enhance the redox reaction kinetics. The optimized [Na0.396Li0.044][Mn0.97Li0.03]O-2 composite delivers an excellent rate performance with a reversible capacity of 97.0 mA h g(-1) at 15 C, corresponding to 82.5% of the capacity at 0.1 C, and a promising cycling stability over 1200 cycles with remarkable capacity retention of 81.0% at 10 C. Moreover, by combining with hard carbon anodes, the full cell demonstrates a high specific capacity and favorable cyclability. After 200 cycles, the cell provides 105.0 mA h g(-1) at 1 C, demonstrating the potential of the cathode for practical applications. This strategy might apply to other sodium-deficient cathode materials and inform their strategic design. English WILEY-V C H VERLAG GMBH HIGH-CAPACITY HIGH-ENERGY NA0.44MNO2 LI NANOWIRES STORAGE CAPABILITY INSERTION NANORODS LAYER Lithium-Substituted Tunnel/Spinel Heterostructured Cathode Material for High-Performance Sodium-Ion Batteries Article 10.1002/adfm.202008569 1 ADVANCED FUNCTIONAL MATERIALS, v.31, no.10 ADVANCED FUNCTIONAL MATERIALS 31 10 scie scopus 000598290900001 2-s2.0-85097488202 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article HIGH-CAPACITY HIGH-ENERGY NA0.44MNO2 LI NANOWIRES STORAGE CAPABILITY INSERTION NANORODS LAYER cathode material lithium substitution sodium ion battery tunnel/spinel heterostructure tunnel-type Na0.44MnO2