假电容
插层(化学)
石墨烯
钴
材料科学
空位缺陷
电极
异质结
密度泛函理论
无机化学
储能
纳米技术
化学工程
超级电容器
光电子学
电化学
物理化学
热力学
化学
结晶学
计算化学
冶金
功率(物理)
工程类
物理
作者
Ding Yuan,Yuhai Dou,Yuhui Tian,David Adekoya,Li Xu,Shanqing Zhang
标识
DOI:10.1002/anie.202106857
摘要
Abstract Electronic structure engineering on electrode materials could bring in a new mechanism to achieve high energy and high power densities in sodium ion batteries. Herein, we design and create Co vacancies at the interface of atomically thin CoSe 2 /graphene heterostructure and obtain Co 1− x Se 2 /graphene heterostructure electrode materials that facilitate significant Na + intercalation pseudocapacitance. Density functional theory (DFT) calculation suggests that the Na + adsorption energy is dramatically increased, and the Na + diffusion barrier is remarkably reduced due to the introduction of Co vacancy. The optimized electrode delivers a superior capacity of 673.6 mAh g −1 at 0.1 C, excellent rate capability of 576.5 mAh g −1 at 2.0 C and ultra‐long life up to 2000 cycles. Kinetics analysis indicates that the enhanced Na + storage is mainly attributed to the intercalation pseudocapacitance induced by Co vacancies. This work suggests that the creation of cation vacancy could bestow heterostructured electrode materials with pseudocapacitive Na + intercalation for high‐capacity and high‐rate energy storage.
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