3D ordered macroporous germanium fabricated by electrodeposition from an ionic liquid and its lithium storage properties

Liu, Xin; Zhao, Jiupeng; Hao, Jian; Su, Bao‐Lian; Li, Yao

doi:10.1039/c3ta12923c

Cited by 70 publications

(39 citation statements)

References 32 publications

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“…For this experiment, the deposition potential was maintained at about À 1.47 V for 30 min. These results are similar to those reported for Ge deposited on Cu foil [21] and indicate that the CNTs are of high quality and provide good electrical conductivity. Fig.…”

Section: Methodssupporting

confidence: 92%

Ionic liquid electrodeposition of germanium/carbon nanotube composite anode material for lithium ion batteries

Hao

et al. 2015

Materials Letters

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Section: Methodssupporting

confidence: 92%

Ionic liquid electrodeposition of germanium/carbon nanotube composite anode material for lithium ion batteries

Hao

et al. 2015

Materials Letters

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“…This approach is ilustrated in a number of recent studies utilizing porous Ge NPs or a nanoporous Ge network [57][58][59][60][61], which were prepared from simple (e.g. mechanochemical synthesis) to often-complicated synthesis (e.g.…”

Section: Three-dimensional Porous Gementioning

confidence: 99%

“…In a similar study, Ge NPs were electrodeposited at room temperature in PS templates to form a 3D ordered mesoporous Ge with a highly crystalline phase. , for 0.05C, 0.2, and 0.5C, respectively, after 600 cycles [61]. The authors argue that the superior performance of the porous GeOx anode arises from the synergy of the material's four characteristics: small primary particles, porous structure, amorphous state, and the incorporation of oxygen.…”

Section: Three-dimensional Porous Gementioning

confidence: 99%

High Energy Density Germanium Anodes for Next Generation Lithium Ion Batteries

Ocon¹,

Lee²,

Lee³

2014

Applied Chemistry for Engineering

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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.

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“…[18][19][20][21][22][23][24][25] Nevertheless, the practical application of Ge is hindered by the pulverization problem caused by the large volume changes during Li insertion/extraction processes, thus leading to the loss of electrical conductivity and consequently a rapid capacity decline upon cycling. [26][27][28][29][30][31] Previously studies have demonstrated that decreasing the Ge particle size into the nanometer range could alleviate the stress produced during Li uptake and release processes and suppress the tendency of the nanostructure to fracture. [32][33][34][35] Moreover, the nanostructure can facilitate the diffusion of Li ion, resulting in high rate capability.…”

Section: Introductionmentioning

confidence: 99%

Ge Nanoparticles Encapsulated in Nitrogen-Doped Reduced Graphene Oxide as an Advanced Anode Material for Lithium-Ion Batteries

Zhu

Zhou

et al. 2014

J. Phys. Chem. C

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Ge nanoparticles/C composites are desirable electrode materials for high energy and power density lithium-ion batteries. However, the production of well-dispersed Ge nanoparticles in a carbon network remains a challenge because of rapid grain growth during high-temperature thermal reduction. Herein, we report a PVP-assisted hydrolysis approach for fabricating Ge nanoparticles/reduced graphene oxide composite (denoted as Ge/RGO) made of ~5 nm Ge nanoparticles that are uniformly distributed within a nitrogen-doped RGO carbon matrix. The Ge/RGO composite exhibits an initial discharge capacity of 1475 mA h g −1 and a reversible capacity of 700 mA h g −1 after 200 cycles at a current density of 0.5 A g −1 . Moreover, Ge/RGO shows a capacity of 210 mA h g −1 even at a high current density of 10 A g −1 . The excellent performance of the Ge/RGO composite is attributed to its unique nanostructure, including Ge nanoparticles, homogeneous particle distribution, and highly conductive RGO carbon matrix.These properties alleviate the pulverization problem, prevent Ge particle aggregation, and facilitate electron and lithium ion transportation.

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3D ordered macroporous germanium fabricated by electrodeposition from an ionic liquid and its lithium storage properties

Cited by 70 publications

References 32 publications

Ionic liquid electrodeposition of germanium/carbon nanotube composite anode material for lithium ion batteries

Ionic liquid electrodeposition of germanium/carbon nanotube composite anode material for lithium ion batteries

High Energy Density Germanium Anodes for Next Generation Lithium Ion Batteries

Ge Nanoparticles Encapsulated in Nitrogen-Doped Reduced Graphene Oxide as an Advanced Anode Material for Lithium-Ion Batteries

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