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Preparation and Electrochemical Properties of Bowl-shaped C@FeS2@NC Composites |
LIU Dongxuan, CHEN Ping(), CAO Xinrong, ZHOU Xue, LIU Ying |
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China |
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Cite this article:
LIU Dongxuan, CHEN Ping, CAO Xinrong, ZHOU Xue, LIU Ying. Preparation and Electrochemical Properties of Bowl-shaped C@FeS2@NC Composites. Chinese Journal of Materials Research, 2023, 37(1): 1-9.
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Abstract The bowl-like C@FeS2@NC (nitrogen doped carbon layer) composites were prepared via a multi-step process, namely the silicon dioxide microspheres were firstly coated with phenolic resin and then converted into carbon shell at high temperature, soon after which were subjected to solvothermal reaction, dopamine coating, high temperature vulcanization and sodium hydroxide etching. This composite material has an open three-dimensional bowl-like structure, which can well release the stress caused by volume change. Its large specific surface area (70.67 m2·g-1) has a lot of active sites. The double carbon shell composite consisted of an inner and an outer carbon shells, as a stable mechanical framework, can enhance the electrical conductivity, while the outer NC has a good protective effect. When this composite material is used as the negative electrode of lithium-ion battery, the discharge specific capacity and charge specific capacity of the first turn are 954.3 mAh·g-1 and 847.2 mAh·g-1, respectively at the current density of 0.2 A·g-1, and the corresponding Coulomb efficiency of the first turn is 88.78%. After 100 cycles, the discharge specific capacity is stable at 793.8 mAh·g-1.
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Received: 29 April 2022
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Fund: the Liaoning Revitalization Talents Program(XLYC1802085);National Natural Science Foundation of China(51873109);Dalian Science and Technology Innovation Fund Project(2019J11CY007) |
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