Template-based fabrication and electrochemical performance of CoSb nanowire arrays

Yang, Youwen; Chen, Yanbiao; Liu, Fei; Chen, Xiangying; Wu, Yucheng

doi:10.1016/j.electacta.2011.05.011

Cited by 23 publications

(12 citation statements)

References 28 publications

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“…Our work has also shown that LiMnO 2 nanorods exhibited higher discharge capacity and better cyclability than LiMnO 2 nanoparticles [17]. In addition to these examples of cathode materials, similar phenomena have also been found for many anode materials, such as SnO 2 [18], Si [19], Co 3 O 4 [20], TiO 2 [21], CoSb [22]. This has fully demonstrated that one-dimensional nanomaterials display desirable properties.…”

Section: Introductionsupporting

confidence: 50%

Facile synthesis of LiCoO2 nanowires with high electrochemical performance

et al. 2011

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Cobalt precursor Co(CO 3 ) 0.35 Cl 0.2 (OH) 1.1 nanowire bunches have been synthesized by a hydrothermal method and transformed into Co 3 O 4 nanowires by calcination at 500 °C for 3 h. The Co 3 O 4 nanowires were then mixed with LiOH and formed the LiCoO 2 nanowires by calcination at 750 °C . High resolution transmission electron microscopy revealed that the LiCoO 2 nanowires were composed of nanoparticles with most of the nanoparticles having exposed (010) planes. The electrochemical performance of the LiCoO 2 nanowires was thoroughly investigated by galvanostatic tests. The as-prepared LiCoO 2 nanowires exhibited excellent rate capability and satisfactory cycle stability, where the charge and discharge capacity still stabilized at 100 mA·h/g at a rate of 1000 mA/g after 100 cycles. The favorable electrochemical performance of the LiCoO 2 nanowires may result from their one-dimensional nanostructure and the exposure of (010) planes, since the (010) plane is electrochemically active for layered LiCoO 2 with the α-NaFeO 2 structure and favors fast Li + transportation.

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Section: Introductionsupporting

confidence: 50%

Facile synthesis of LiCoO2 nanowires with high electrochemical performance

et al. 2011

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“…Sb is a promising anode material for high-power lithium-ion batteries due to its moderate operating potential of 0.8 V versus Li/Li + , and higher specific capacity of 660 mAh g –1 , compared with commercial graphite and lithium titanate. − However, the capacity of Sb electrodes still decays significantly with cycling, which was ascribed to the formation of intermediate phases between Sb and lithium . In addition, Sb electrodes undergo a large volume expansion (134%) during lithiation, resulting in severe mechanical issues such as pulverization, loss of contact, and delamination. − To overcome these issues, the most common approach is to introduce carbon-based − or other inactive matrixes, such as Ni, − Cu, and Co, to buffer the large volume expansion. A carbon matrix is effective in suppressing material cracking and improving electrical conductivity, but the mass production of nanocarbon materials is rather difficult. − Incorporation of inactive matrixes into Sb reduces the relative amount of volume expansion but at the same time decreases its specific capacity to less than 300 mAh g –1 , which is even lower than that of commercial graphite.…”

Section: Introductionmentioning

confidence: 99%

“…5 In addition, Sb electrodes undergo a large volume expansion (134%) during lithiation, resulting in severe mechanical issues such as pulverization, loss of contact, and delamination. 6−8 To overcome these issues, the most common approach is to introduce carbon-based 9−19 or other inactive matrixes, such as Ni, 13−15 Cu, 16 and Co, 17 to buffer the large volume expansion. A carbon matrix is effective in suppressing material cracking and improving electrical conductivity, but the mass production of nanocarbon materials is rather difficult.…”

Section: ■ Introductionmentioning

confidence: 99%

Reversible Interaction of Sb with an Active Se Matrix Enhances the Cycle Stability of Electrodes for Lithium-Ion Batteries

et al. 2019

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Sb is a promising anode material for lithiumion batteries, but it suffers from fast capacity fading. Previous works have shown that the combination of Sb with an active S or Se matrix improves the cycle stability of the electrodes, although there was no clear verification of the exact mechanism. In this study, we used ex situ X-ray diffraction, ex situ Raman spectroscopy, and in situ dilatometry to study the interactions of Sb with S and Se and to reveal the reasons for the superior cycle stability of Sb 2 Se 3 electrodes. Our results show that the poor stability of Sb electrodes is due to the crystallization of Li 3 Sb, leading to the large volume change, high stress, and mechanical failure of the particles. Addition of S or Se into the matrix can inhibit the formation of crystalline Li 3 Sb, thus improving capacity retention. The stabilization effect is stronger for a Se matrix than for a S matrix because it enables the re-formation of Sb−Se bonds upon delithiation and prevents phase segregation. In addition, the Se matrix reduces the volume change of the electrode during the charge and discharge, preventing electrode cracking and resulting in good mechanical reversibility.

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“…Earlier [22], within certain approximations, the analytical equations for calculating some characteristics of pores filling process were obtained: the variation of current with the time; the time required for pores filling (based on the experimental works [5,14], it was assumed that all pores are filled simultaneously) at various overpotentials; etc. The calculations were performed for the second stage of pores filling, because the first stage is relatively short and the third stage is beyond the pores filling process (the pores filling is completed at the second stage).…”

Section: Introductionmentioning

confidence: 99%

“…can be easily solved numerically for an arbitrary number of pores.It should be noted that the current density averaged over the surface of specimen can be expressed as follows: 21),(22) and(24) are the generalization of Eqs. (8),(9) and(14). They can be used for all considered cases of pores filling.…”

mentioning

confidence: 99%