材料科学
阴极
锰
硼
插层(化学)
离子
八面体
化学工程
钠
无机化学
冶金
化学
有机化学
物理化学
工程类
作者
Tingting Yang,Qiang Li,Zhengbo Liu,Tianyi Li,Kamila M. Wiaderek,Yingxia Liu,Zijia Yin,Si Lan,Wei Wang,Yan Tang,Yang Ren,Qi Liu
标识
DOI:10.1002/adma.202306533
摘要
Abstract Advanced high‐energy‐density sodium‐ion batteries (SIBs) are inseparable from cathode materials with high specific capacities. Layered manganese‐rich oxides (Na x MnO 2 , 0.6 ≤ x ≤1) are promising cathode materials owing to their ease of intercalation and extraction of a considerable amount of sodium ions. However, lattice interactions, especially electrostatic repulsive forces and anisotropic stresses, are usually caused by deep desodiatin/sodiation process, resulting in intragranular cracks and capacity degradation in SIBs. Here, boron ions are introduced into the layered structure to build up B─O─Mn bonds. The regulated electronic structure in Na 0.637 B 0.038 MnO 2 (B‐NMO) materials inhibits the deformation of MnO 6 octahedra, which finally achieves a gentle structural transition during the deep sodiation process. B‐NMO electrode exhibits a high capacity (141 mAh g –1 ) at 1 C with a capacity retention of 81% after 100 cycles. Therefore, anchoring boron to manganese‐rich materials inhibits the detrimental structural evolution of deep sodiation and can be used to obtain excellent cathode materials for SIBs.
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