期刊
ACS NANO
卷 13, 期 7, 页码 7939-7948出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b02384
关键词
potassium-ion batteries; anode materials; high power density; cycling stability; V5S8 nanosheets
类别
资金
- Youth Project in Nature Science Foundation of Jiangsu Province [BK20161006]
- National Natural Science Foundation of China [51702046, 51822202, 51432004, 51802357]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00025]
- China Postdoctoral Science Foundation [2018M640316]
- Australian Research Council (ARC) [FT150100109, DP170102406, DE190100504]
- Shanghai Pujiang Program [17PJ1400100]
- Shanghai Committee of Science and Technology, China [17ZR1401000]
- Hubei Provincial Natural Science Foundation of China [2018CFB237]
- Fundamental Research Funds for the Central Universities [CZT19003]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University
Due to the abundant potassium resource on the Earth's crust, researchers now have become interested in exploring high-performance potassium-ion batteries (KIBs). However, the large size of would hinder the diffusion of K ions into electrode materials, thus leading to poor energy/power density and cycling performance during the depotassiation/potassiation process. So, few-layered V5S8 nanosheets wrapping a hollow carbon sphere fabricated via a facile hollow carbon template induced method could reversibly accommodate K storage and maintain the structure stability. Hence, the as-obtained V5S8@C electrode enables rapid and reversible storage of K+ with a high specific capacity of 645 mAh/g at 50 mA/g, a high rate capability, and long cycling stability, with 360 and 190 mAh/g achieved after 500 and 1000 cycles at 500 and 2000 mA/g, respectively. The excellent electrochemical performance is superior to the most existing electrode materials. The DFT calculations reveal that V5S8 nanosheets have high electrical conductivity and low energy barriers for K+ intercalation. Furthermore, the reaction mechanism of the V5S8@C electrode in KIBs is probed via the in operando synchrotron X-ray diffraction technique, and it indicates that the V5S8@C electrode undergoes a sequential intercalation (KV5S8) and conversion reactions (K2S3) reversibly during the potassiation process.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据