阳极
复合数
电化学
材料科学
离子
钠
碳纤维
色散(光学)
金属
储能
化学工程
兴奋剂
纳米技术
复合材料
冶金
化学
电极
光电子学
工程类
功率(物理)
物理化学
有机化学
物理
光学
量子力学
作者
Chun Yuan,Baolin Liu,Hongyu Zhang,Hongjuan Ma,Zhenjiang Lu,Jia Xie,Jindou Hu,Yingnan Cao
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2024-01-01
摘要
The development of layered metal sulfides with stable structure and accessible active sites is of great importance for sodium-ion batteries (SIBs). Herein, a simple liquid-mixing method is elaborately designed to immobilize WS2 nanoflakes on N-doped carbon (NC), then further coat carbon to produce WS2/NC@C. In the formation process of this composite, the presence of NC not only avoids the overlap and improves the dispersion of WS2 nanoflakes, but also creates a connection network for charge transfer, where the wrapped carbon provides a stable chemical and electrochemical reaction interface. Thus, the composite of WS2/NC@C exhibits the desired Na+ storage capacity as anticipated. The reversible capacity reaches the high value of 369.8 mA h g-1 at 0.2 A g-1 after 200 cycles, while excellent rate performances and cycle life are also acquired in that capacity values of 256.7 and 219.6 mA h g-1 at 1 and 5 A g-1 are preserved after 1000 cycles, respectively. In addition, the assembled sodium-ion hybrid capacitors (SIHCs, AC//WS2/NC@C) exhibit an energy/power density of 68 W h kg-1 at 64 W kg-1, and capacity retention of 82.9% at 1 A g-1 after 2000 cycles. The study provides insight into developing layered metal sulfides with eminent performance of Na+ storage.
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