材料科学
热解炭
聚偏氟乙烯
阴极
碳纳米纤维
碳纤维
电化学
电导率
化学工程
导电体
复合材料
电极
纳米技术
碳纳米管
热解
复合数
化学
聚合物
物理化学
工程类
作者
И. А. Стенина,Polina Minakova,Т. Л. Кулова,A. B. Yaroslavtsev
出处
期刊:Batteries
[MDPI AG]
日期:2022-09-05
卷期号:8 (9): 111-111
被引量:8
标识
DOI:10.3390/batteries8090111
摘要
The influence of different conductive additives (carbon nanofibers (CNFs), carbon nanoplatelets, and pyrolytic carbon from sucrose (Sucr) or polyvinylidene fluoride) on the morphology, electron conductivity, and electrochemical performance of LiFePO4-based cathodes was investigated to develop the most efficient strategy for the fabrication of high-rate cathodes. Pyrolytic carbon effectively prevents the growth of LiFePO4 grains and provides contact between them, CNFs provide fast long-range conductive pathways, while carbon nanoplatelets can be embedded in carbon coatings as high-conductive “points” which enhance the rate capability and decrease the capacity fading of LFP. The LiFePO4/CSucr/CNF showed better performance than the other cathodes due to the synergy of the high-conductive CNF network (the electronic conductivity was 1.3 × 10−2 S/cm) and the shorter Li+ ion path (the lithium-ion diffusion coefficient was 2.1 × 10−11 cm2/s). It is shown that the formation of composites based on LFP and carbon nanomaterials via mortar grinding is a more promising strategy for electrode material manufacturing than ball milling.
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