碳包覆Fe_3O_4纳米负极材料的制备及电化学性能
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摘要
以Fe(NO_3)_3·9 H_2O作为铁源、无水葡萄糖为碳源,利用水热法及高温煅烧法制备碳包覆Fe_3O_4纳米颗粒。通过控制不同C/Fe摩尔比,探究其对材料形貌结构及电化学性能的影响。研究表明:当C/Fe摩尔比为10时,碳包覆Fe_3O_4纳米颗粒具有完整的碳包覆结构且分散程度好、粒径均一,具有最优的电化学性能;在100 mA/g的恒定电流密度下循环100次后,可逆比容量为741.5 mAh/g,容量保持率可达65.9%。
The carbon coated Fe_3O_4 nanocomposites were fabricated by using hydrothermal reaction of Fe(NO_3)_3·9 H_2 O and glucose followed by thermal annealing. The influence of different C/Fe mole ratio on the morphology and electrochemical properties for the materials were studied. The researches show that when the C/Fe molar ratio of 10, the carbon coated Fe_3O_4 nanoparticles have integrated carbon coating structure, good dispersion and uniform size distribution with the best electrochemical performance. When used as the anode materials for the lithium-ion batteries, the reversible specific capacity is achieved to 741.5 mAh/g at current density of 100 mA/g even after 100 cycles, and the capacity retention rate can reach 65.9%as well.
The carbon coated Fe_3O_4 nanocomposites were fabricated by using hydrothermal reaction of Fe(NO_3)_3·9 H_2 O and glucose followed by thermal annealing. The influence of different C/Fe mole ratio on the morphology and electrochemical properties for the materials were studied. The researches show that when the C/Fe molar ratio of 10, the carbon coated Fe_3O_4 nanoparticles have integrated carbon coating structure, good dispersion and uniform size distribution with the best electrochemical performance. When used as the anode materials for the lithium-ion batteries, the reversible specific capacity is achieved to 741.5 mAh/g at current density of 100 mA/g even after 100 cycles, and the capacity retention rate can reach 65.9%as well.
引文
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[4] DONG Y, MD K, CHUI Y S, et al. Synthesis of CNT@Fe3O4-C hybrid nanocables as anode materials with enhanced electrochemical performance for lithium ion batteries[J]. Electrochimica Acta,2015, 176:1332-1337.
[5] ZHAO N, WU S, HE C, et al. One-pot synthesis of uniform Fe3O4nanocrystals encapsulated in interconnected carbon nanospheres for superior lithium storage capability[J]. Carbon, 2013, 57(6):130-138.
[6] CHEN S, BAO P, WANG G. Synthesis of Fe2O3-CNT-graphene hybrid materials with an open three-dimensional nanostructure for high capacity lithium storage[J]. Nano Energy, 2013, 2(3):425-434.
[7] ZUO Y T, WANG G, PENG J, et al. Hybridization of graphene nanosheets and carbon-coated hollow Fe3O4nanoparticles as a high-performance anode material for lithium-ion batteries[J]. Journal of Materials Chemistry A, 2016, 4(7):2453-2460.
[8] ZHANG Y, LI Y, LI H, et al. Electrochemical performance of carbon-encapsulated Fe3O4nanoparticles in lithium-ion batteries:morphology and particle size effects[J]. Electrochimica Acta, 2016,216:475-483.