Cation-mixing stabilized layered oxide cathodes for sodium-ion batteries

• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2018,（6）
• 页码范围: 376-384
• 页数: 9页
• 语种: 英文

摘要

Sodium-ion batteries are promising for large-scale energy storage due to sodium's low cost and infinite abundance.The most popular cathodes for sodium-ion batteries,i.e.,the layered sodium-containing oxides,usually exhibit reversible host rearrangement between P-type and O-type stacking upon charge/discharge.Herein we demonstrate that such host rearrangement is unfavorable and can be suppressed by introducing transition-metal ions into sodium layers.The electrode with stabilized P3-type stacking delivers superior rate capability,high energy efficiency,and excellent cycling performance.Owing to the cation-mixing nature,it performs the lowest lattice strain among all reported cathodes for sodium-ion batteries.Our findings highlight the significance of a stable host for sodium-ion storage and moreover underline the fundamental distinction in material design strategy between lithium-and sodium-ion batteries.