材料科学
复合数
碳纤维
多孔性
电解质
阴极
电化学
化学工程
复合材料
扩散
电极
化学
物理
物理化学
工程类
热力学
作者
Junghoon Yang,Du Young Choi,Kwang‐Seok Kim,Dae Up Kim,Jungpil Kim
出处
期刊:Polymers
[MDPI AG]
日期:2021-12-31
卷期号:14 (1): 149-149
被引量:4
标识
DOI:10.3390/polym14010149
摘要
Na3V2(PO4)3 is regarded as one of the promising cathode materials for next-generation sodium ion batteries, but its undesirable electrochemical performances due to inherently low electrical conductivity have limited its direct use for applications. Motivated by the limit, this study employed a porous carbon network to obtain a porous carbon network-Na3V2(PO4)3 composite by using poly(vinylalcohol) assised sol-gel method. Compared with the typical carbon-coating approach, the formation of a porous carbon network ensured short ion diffusion distances, percolating electrolytes by distributing nanosized Na3V2(PO4)3 particles in the porous carbon network and suppressing the particle aggregation. As a result, the porous carbon network-Na3V2(PO4)3 composite exhibited improved electrochemical performances, i.e., a higher specific discharge capacity (~110 mAh g-1 at 0.1 C), outstanding kinetic properties (~68 mAh g-1 at 50 C), and stable cyclic stability (capacity retention of 99% over 100 cycles at 1 C).
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