共 41 条
Synthesis of LiCoPO4/C nanocomposite fiber mats as free-standing cathode materials for lithium-ion batteries with improved electrochemical properties
被引:9
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Nagashima, Takeru
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Tokyo Inst Technol, Dept Chem Sci & Engn, 12-1 Ookayama 2,Meguro Ku, Tokyo 1528552, Japan Tokyo Inst Technol, Dept Chem Sci & Engn, 12-1 Ookayama 2,Meguro Ku, Tokyo 1528552, Japan

Taniguchi, Izumi
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Tokyo Inst Technol, Dept Chem Sci & Engn, 12-1 Ookayama 2,Meguro Ku, Tokyo 1528552, Japan Tokyo Inst Technol, Dept Chem Sci & Engn, 12-1 Ookayama 2,Meguro Ku, Tokyo 1528552, Japan
机构:
[1] Tokyo Inst Technol, Dept Chem Sci & Engn, 12-1 Ookayama 2,Meguro Ku, Tokyo 1528552, Japan
基金:
日本学术振兴会;
关键词:
LiCoPO4;
SiO2;
coating;
Free-standing cathode;
Lithium-ion batteries;
Energy storage;
OLIVINE LICOPO4;
PERFORMANCE;
COMPOSITES;
STABILITY;
LIPF6;
FILMS;
D O I:
10.1016/j.electacta.2022.140400
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
LiCoPO4/C nanocomposite fiber mats were successfully synthesized by electrospinning with a two-step heat treatment using nanostructured LiCoPO4 microparticles prepared by spray pyrolysis. The effects of the pre-oxidation temperature on the physical properties of the synthesized materials were studied. The fiber mats pre-oxidized at 425 C and subsequently annealed at 700 C in a N-2 atmosphere contained 7 wt.% carbon and the small agglomerates of LiCoPO4 nanoparticle were evenly incorporated in carbon fibers with a few hundred nanometers. This fiber mat had a high specific surface area of 338 m(2) g(-1) and a large meso-macropore volume of 0.71 cm3 g-1. It was directly used as a free-standing electrode without a binder and a current collector for lithium batteries. The cell exhibited an initial discharge capacity of 115 mAh g(-1) at 0.1 C. The effects of SiO2 coating on the electrochemical properties of LiCoPO4/C nanocomposite fiber mats were further studied. Finally, the SiO2- coated LiCoPO4/C (15 wt.%) nanocomposite fiber mat with 2 wt.% SiO2 demonstrated superior capacity retention to uncoated ones, and the initial discharge capacities reached 126 mAh g(-1) at 0.05 C and 100 mAh g(-1) at 1 C, respectively.
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