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4. Graphene oxide coated nanosheet‐like γ‐MnS@KB‐S fabricated by spray drying for high energy density Li‐S batteries.

Author

Guo, Daofeng, Qian, Xinye, Jin, Lina, Yao, Shanshan, Shen, Xiangqian, Li, Tianbao, and Qin, Shibiao

Subjects
*SPRAY drying, *LITHIUM sulfur batteries, *ENERGY density, *GRAPHENE oxide, *OXIDE coating, *CATHODES, *ELECTROCHEMICAL electrodes
Abstract

Summary: In order to prohibit the shuttle influence of lithium polysulfides in lithium sulfur battery, a kind of graphene oxide (GO) coated γ‐MnS@KB‐S (GO@MKB‐S) composite cathode material was successfully fabricated. First of all, the γ‐MnS@KB (MKB) composite powders were prepared via a solvothermal reaction, then a spray drying method was used to obtain GO@MKB‐S composites, which displays core/shell nanostructure. SEM, TEM, XRD as well as Raman spectrum are implemented to look into the microstructures and the functions of the 2D nanosheet‐like γ‐MnS in setting in KB on the battery performance were carefully analyzed. It is demonstrated that electrochemical discharge capacity and rate performance are clearly improved by using GO@MKB‐S composites compared to the cathode electrode of the GO coated KB‐S (GO@KB‐S). With a sulfur loading of 5 mg cm−2, the cathode electrode of GO@MKB‐S shows a considerable discharge capacity of 749.9 mAh g−1 at 0.36 C. Additionally, the Li‐S battery cycle retention of GO@MKB‐S sample maintains 97.36% after 100 cycles and 78.69% after 200 cycles. [ABSTRACT FROM AUTHOR]

Published
2020
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5. The study about the temperature distribution of the sphere medium surface

Author

Guo Daofeng, Wang Jiasen, and Zhongqi Liu

Subjects
Surface (mathematics), Physics, Optics, Thermal radiation, Plane (geometry), Infrared, business.industry, Body surface, Heat transfer, Mechanics, business, Thermal conduction, Distribution (differential geometry)
Abstract

The medical examinations by the infrared ray are used to examine some illnesses, and they are not harmful to us. The body surface is considered as the plane in the examinations, but the parts of our bodies are the curved surfaces and the results are more exact when we consider the bodies as the curved surfaces. The sphere is the most simple curved surface so we studied the sphere medium interface, the heat radiation temperature distribution of the sphere medium based on the experiments and put forward the theory to explain the temperature distribution. We hope to give the supplement for the earlier research through our research.

Published
2007

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