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.
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 oxi- des, usually exhibit reversible host rearrangement between P-type and O-type stacking upon charge/dis- charge. 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.
基金
The financial support from the National Basic Research Program of China(2014CB932300)
Natural Science Foundation of Jiangsu Province of China(BK20170630)
NSF of China(21633003 and 51602144)
sponsored by the JST-CREST ‘‘Phase Interface Science for Highly Efficient Energy Utilization",JST(Japan)
作者简介
Corresponding author:Shaohua Guo,E-mail addresses:shguo@nju.edu.cn;Corresponding author:Haoshen Zhou,E-mail addresses:hszhou@nju.edu.cn;Shaohua Guo contributed equally to this work;Yang Sun contributed equally to this work.
