期刊
ACS APPLIED ELECTRONIC MATERIALS
卷 4, 期 10, 页码 4936-4946出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaelm.2c00939
关键词
natural graphite; polyvinylidene fluoride; hydrothermal treatment; rate performance; low temperature
资金
- Shandong Provincial Natural Science Foundation, PR China [ZR2019MEM029]
- National Natural Science Foundation of China [51902189]
- Shenzhen Municipal Special Fund for Guiding Local Scientific and Technological Development [2021SZVUP071]
- Shandong University Testing and Manufacturing Center for Advanced Materials
In this work, natural graphite (NG) was modified with polyvinylidene fluoride (PVDF) through a simple hydrothermal route and subsequent sintering, leading to enhanced electrochemical performance, especially in terms of rate performance, cyclability, and low-temperature performance.
The inferior rate performance, cyclability, and low-temperature performance plague the wide application of natural graphite (NG). In this work, NG was modified with polyvinylidene fluoride (PVDF) by a simple hydrothermal route at 180 degrees C and subsequent sintering at 300 degrees C. The two-step treatment not only boosted the graphitization degree of NG but also strengthened the binding of PVDF with NG to yield uniform PVDF coating and F-doping adjacent to the NG surface. The modification contributes to enhancing the structural stability of NG, electron transfer, and Li-ion diffusion, facilitating the formation of a uniform and dense solid electrolyte interface film, reducing impedance, and alleviating polarization, thus endowing the PVDF-modified NG with elevated electrochemical performance, especially the marked enhancement in rate performance, cyclability, and low-temperature performance. This work opens up a simple avenue to promote the performance of NG, and the technique could be scaled up to industrially produce NG with high performance in a wide temperature range.
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