Germanium Nanotubes Prepared by Using the Kirkendall Effect as Anodes for High‐Rate Lithium Batteries

Park, Mi-Hee; Cho, Yong Hyun; Kim, Kitae; Kim, Je Young; Liu, Meilin; Cho, Jaephil

doi:10.1002/ange.201103062

Cited by 112 publications

(95 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thereby proving that delithiation in Ge, which causes extreme mechanical stress due to the large volume variation, does not result into cracking. The formation of porous Ge structure validates an earlier observation made using ex situ techniques, showing the strong consistency between in situ and ex situ methods [45]. Pore formation was found to occur from the combination of vacant sites, previously occupied by Li ions, and has similarity in structure with porous materials after dealloying.…”

Section: Germanium As Lib Anodesupporting

confidence: 70%

High Energy Density Germanium Anodes for Next Generation Lithium Ion Batteries

Ocon¹,

Lee²,

Lee³

2014

Applied Chemistry for Engineering

View full text Add to dashboard Cite

Lithium ion batteries (LIBs) are the state-of-the-art technology among electrochemical energy storage and conversion cells, and are still considered the most attractive class of battery in the future due to their high specific energy density, high efficiency, and long cycle life. Rapid development of power-hungry commercial electronics and large-scale energy storage applications (e.g. off-peak electrical energy storage), however, requires novel anode materials that have higher energy densities to replace conventional graphite electrodes. Germanium (Ge) and silicon (Si) are thought to be ideal prospect candidates for next generation LIB anodes due to their extremely high theoretical energy capacities. For instance, Ge offers relatively lower volume change during cycling, better Li insertion/extraction kinetics, and higher electronic conductivity than Si. In this focused review, we briefly describe the basic concepts of LIBs and then look at the characteristics of ideal anode materials that can provide greatly improved electrochemical performance, including high capacity, better cycling behavior, and rate capability. We then discuss how, in the future, Ge anode materials (Ge and Ge oxides, Ge-carbon composites, and other Ge-based composites) could increase the capacity of today's Li batteries. In recent years, considerable efforts have been made to fulfill the requirements of excellent anode materials, especially using these materials at the nanoscale. This article shall serve as a handy reference, as well as starting point, for future research related to high capacity LIB anodes, especially based on semiconductor Ge and Si.

show abstract

Section: Germanium As Lib Anodesupporting

confidence: 70%

High Energy Density Germanium Anodes for Next Generation Lithium Ion Batteries

Ocon¹,

Lee²,

Lee³

2014

Applied Chemistry for Engineering

View full text Add to dashboard Cite

show abstract

“…Carbon coating is suggested as a means to restrict surface re-oxidation, in addition to providing a buffer matrix for the volumetric changes induced on alloying. Other 1D nanostructures displaying enhanced anodic performance include Ge/CNT composites [62,63], dual-layer Si/Ge nanotube arrays [64] and solution-grown Ge nanotubes prepared from Ge-Sn nanowires [65]. The Ge nanotubes displayed high charge capacities (965 mA h g -1 at C/2 rate) and good rate performance, owing to their unique morphology [65], while Si/Ge nanotube arrays displayed excellent cycling characteristics as a result of minimal hoop strain [64].…”

Section: Germaniummentioning

confidence: 99%

Evaluating the performance of nanostructured materials as lithium-ion battery electrodes

et al. 2013

View full text Add to dashboard Cite

Access to the full text of the published version may require a subscription. Rights © Tsinghua University Press and Springer-Verlag Berlin ABSTRACTThe performance of the lithium-ion cell is heavily dependent on the ability of the host electrodes to accommodate and release Li + ions from the local structure. While the choice of electrode materials may define parameters such as cell potential and capacity, the process of intercalation may be physically limited by the rate of solid-state Li + diffusion. Increased diffusion rates in lithium-ion electrodes may be achieved through a reduction in the diffusion path, accomplished by a scaling of the respective electrode dimensions.In addition, some electrodes may undergo large volume changes associated with charging and discharging, the strain of which, may be better accommodated through nanostructuring. Failure of the host to accommodate such volume changes may lead to pulverisation of the local structure and a rapid loss of capacity. In this review article, we seek to highlight a number of significant gains in the development of nanostructured lithium-ion battery architectures (both anode and cathode), as drivers of potential next-generation electrochemical energy storage devices.

show abstract

“…Reports to-date on binder-free Ge NW electrodes have only shown stability up to 50 cycles. 12,13 A range of nanocomposite architectures have been employed that increase the stability of Ge based anodes over hundreds of cycles for example nanotube networks 18 , dispersions of nanomaterials in active/inactive buffer matrices 19,20 , sheathing of nanostructures with carbon 21 and Ge NWgraphene composites [22][23][24] . A further interesting area of research is the incorporation of pores to improve the performance of Li-alloying nanostructures.…”

mentioning

confidence: 99%