Spherical nanostructured Si/C composite prepared by spray drying technique for lithium ion batteries anode

Chen, Libao; Xie, Xiaohua; Wang, Baofeng; Wang, Ke; Xie, Jian

doi:10.1016/j.mseb.2006.04.029

Cited by 48 publications

(28 citation statements)

References 25 publications

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“…In addition to the aforementioned advantages that C encapsulation of Sn 2 Sb alloy offers, Chen et al [71] have illustrated an additional advantage for spherical nanostructured Si/C composite particles coated with C. (The Si/C nanocomposite is designed to contain 20 wt.% silicon, 30 wt.% graphite, and 50 wt.% PF-pyrolyzed carbon.) As seen in Figure 8.17b, after heat-treating the carbon-coated Si/C spherical particle, hard carbon forms on surface.…”

Section: Si-based Anodesmentioning

confidence: 99%

Nanoscale Engineering for the Mechanical Integrity of Li‐Ion Electrode Materials

Aifantis

Hackney

2008

Nanostructured Materials in Electrochemistry

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Portable power technology plays a key role in the advancement of electronic devices required by modern civilization. Lap-top computers, cellular phones and most portable electronic memory devices require the use of rechargeable batteries. Such batteries have also found use in biomedical devices, including pacemakers and implantable defibrillators. Thus, research focused on the development of rechargeable, high-energy density power sources continues to be driven by technological and commercial applications.Although various types of battery chemistries exist -such as nickel-metal hydride (Ni-MH) and nickel-cadmium (Ni-Cd) -lithium (Li) ion batteries are the dominant force as they have significant advantages in energy density. The large volumetric and gravimetric energy densities exhibited by Li-ion batteries allow their volume and mass to be reduced by 20% and 50%, respectively, as compared to other battery chemistries; in fact, a Li battery can provide three times the voltage of a Ni-Cd or Ni-MH battery. Furthermore, the self-discharge rate of Li batteries is very small over a long period of time, which makes them extremely reliable, while their operating voltage allows a reduction in the number of batteries required to operate a device. All of the aforementioned properties contribute to the miniaturization of electronic devices. Finally, it should be mentioned that -unlike other battery base materials (Cd, Ni) -Li is non-toxic and, as opposed to Ni-Cd batteries, Li-batteries have no memory effect. Moreover, the charging capacity (total time integrated battery current per mass) is not reduced by repeatedly charging and discharging to insufficient levels, and therefore partial charging is possible (the discharging process takes place during the operation of the respective electronic device).One major technological barrier to improvements in energy density and reliability of the Li-ion battery systems is related to the stability of the anode and cathode materials. One of the reasons that Li-ion chemistries exhibit high energy densities is because of the relatively high cell voltage. This means that there is a large j319 Nanostructured Materials in Electrochemistry. Edited by Ali Eftekhari

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Section: Si-based Anodesmentioning

confidence: 99%

Nanoscale Engineering for the Mechanical Integrity of Li‐Ion Electrode Materials

Aifantis

Hackney

2008

Nanostructured Materials in Electrochemistry

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“…This causes the pulverization of Si particles and loose contacts between Si particles and current collector resulting in the mechanical instability and poor cyclability. The volume change and adherence to current collector of Si active material have been regarded as the key factors to the electrochemical stability of Si anodes [2,3]. Therefore, amorphous Si thin film anodes have been investigated extensively because of their smaller volume change and strong adhesion between the active material and current collector.…”

Section: Introductionmentioning

confidence: 99%

An amorphous Si thin film anode with high capacity and long cycling life for lithium ion batteries

et al. 2009

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A Si thin film of thickness 275 nm was deposited on rough Cu foil by magnetron sputtering for use as lithium ion battery anode material. X-ray diffraction (XRD) and TEM analysis revealed that the Si thin film was completely of amorphous structure. The electrochemical performance of the Si thin film was investigated by cyclic voltammetry and constant current charge/discharge test. The film exhibited a high capacity of 3,134 mAh g -1 at 0.025 C rate. The capacity retention was 61.3% at 0.5 C rate for 500 cycles. An island structure formed on the Cu foil substrate after cycling adhered to the substrate firmly and provided electrical connection. This is the possible reason for the long cycling life of Si thin film anode. Moreover, the cycling performance was further improved by annealing at 300°C. The Li ? diffusion coefficients (D 0 ) of Si thin film, measured by cyclic voltammetry, are 1.47 9 10 -9 cm 2 s -1 and 2.16 9 10 -9 cm 2 s -1 for different reduced peaks.

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“…Coulombic efficiency was slightly higher in Si-C composites. It could be explained by formation of favorable SEI on the Si-C x shell, not directly on the Si primary particle [4,5].…”

Section: Resultsmentioning

confidence: 98%

Plasma Sprayed Si Nano Composite Powders for Negative Electrode of Lithium Ion Batteries

Kaga

Hideshima²,

Kambara³

2014

Proceedings of the 12th Asia Pacific Physics Conference (APPC12)

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The electrochemical performance of the Si nano composite powders produced by PS-PVD was analyzed with Li counter electrode. The PS-PVD powders have showed an improved capacity compared to the raw mg-Si as negative electrode. Furthermore composite powders produced with CH 4 addition showed higher specific gravimetric capacities per Si active materials of 1200 mAh/g, compared to 1024 mAh/g for the powders without C, suggesting the effectiveness of C coating on to the primary nano-Si and SiC particle inclusion for reinforcement of the active materials.

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Spherical nanostructured Si/C composite prepared by spray drying technique for lithium ion batteries anode

Cited by 48 publications

References 25 publications

Nanoscale Engineering for the Mechanical Integrity of Li‐Ion Electrode Materials

Nanoscale Engineering for the Mechanical Integrity of Li‐Ion Electrode Materials

An amorphous Si thin film anode with high capacity and long cycling life for lithium ion batteries

Plasma Sprayed Si Nano Composite Powders for Negative Electrode of Lithium Ion Batteries

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