Controlled Li doping of Si nanowires by electrochemical insertion method

Zhou, Guangmin; Li, Hao; Sun, Haijie; Yu, Dapeng; Wang, Y. Q.; Huang, Xing‐Jiu; Chen, L. Q.; Zhang, Z.

doi:10.1063/1.125043

Cited by 96 publications

(42 citation statements)

References 12 publications

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“…In 1999, we reported the electrochemical performance of silicon nanoparticles (SiNPs) and Si nanowires (SiNWs) for the first time. [45,46] Pure nanometer-scale Si powder (80 nm) was prepared by laser-induced silane gas reaction. [47] Si nanowires were synthesized by laser ablation.…”

Section: Nanosized Alloy Anodesmentioning

confidence: 99%

Research on Advanced Materials for Li‐ion Batteries

et al. 2009

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In order to address power and energy demands of mobile electronics and electric cars, Li‐ion technology is urgently being optimized by using alternative materials. This article presents a review of our recent progress dedicated to the anode and cathode materials that have the potential to fulfil the crucial factors of cost, safety, lifetime, durability, power density, and energy density. Nanostructured inorganic compounds have been extensively investigated. Size effects revealed in the storage of lithium through micropores (hard carbon spheres), alloys (Si, SnSb), and conversion reactions (Cr2O3, MnO) are studied. The formation of nano/micro core–shell, dispersed composite, and surface pinning structures can improve their cycling performance. Surface coating on LiCoO2 and LiMn2O4 was found to be an effective way to enhance their thermal and chemical stability and the mechanisms are discussed. Theoretical simulations and experiments on LiFePO4 reveal that alkali metal ions and nitrogen doping into the LiFePO4 lattice are possible approaches to increase its electronic conductivity and does not block transport of lithium ion along the 1D channel.

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Section: Nanosized Alloy Anodesmentioning

confidence: 99%

Research on Advanced Materials for Li‐ion Batteries

et al. 2009

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“…The smallest SiNW diameter reported in works using the VLS approach is larger than 4 nm. [38,39] Using the OAG approach, the diameter can be reduced to almost 1 nm through control of gas flow or substrate temperature. [40] The OAG method has a number of unique characteristics compared to the metal-catalytic VLS growth mechanism of SiNWs:…”

Section: The Temperature Dependence and Coexistence Of Oag And Metal-mentioning

confidence: 99%

Oxide‐Assisted Growth of Semiconducting Nanowires

Lifshitz

Lee³

2003

Advanced Materials

589

452

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In this contribution, we outline oxide‐assisted growth (OAG) (distinct from the conventional metal‐catalytic vapor–liquid–solid (VLS) process) for the growth of nanostructured materials. This synthesis technique, in which oxides instead of metals play an important role in inducing the nucleation and growth of nanowires, is capable of producing large quantities of high‐purity silicon nanowires with a preferential growth direction, uniform size, and long length, without the need for a metal catalyst. The OAG 1D nanomaterials synthesis is complementary to, and coexistent with, the conventional metal‐catalyst VLS approach, and can be utilized to produce nanowires from a host of materials other than Si including Ge nanowires, carbon nanowires, silicon and SnO2 nanoribbons, and Group III–V and II–VI compound semiconductor nanowires.

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“…[6][7][8] Recent investigations into the electrochemical properties of the Li-Si system have demonstrated an improved room temperature cycle life in nanocrystalline and thin film electrodes. 5,[9][10][11][12] An analogous system, Li-Ge, has received little attention. The Li-Ge system has a theoretical capacity of 1.6 Ah/g (Li 4.4 Ge), which is 40% of the theoretical Li-Si capacity.…”

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confidence: 99%

Nanocrystalline and Thin Film Germanium Electrodes with High Lithium Capacity and High Rate Capabilities

Graetz

Ahn

Yazami

et al. 2004

J. Electrochem. Soc.

415

403

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Germanium nanocrystals ͑12 nm mean diam͒ and amorphous thin films ͑60-250 nm thick͒ were prepared as anodes for lithium secondary cells. Amorphous thin film electrodes prepared on planar nickel substrates showed stable capacities of 1700 mAh/g over 60 cycles. Germanium nanocrystals showed reversible gravimetric capacities of up to 1400 mAh/g with 60% capacity retention after 50 cycles. Both electrodes were found to be crystalline in the fully lithiated state. The enhanced capacity, rate capability ͑1000C͒, and cycle life of nanophase germanium over bulk crystalline germanium is attributed to the high surface area and short diffusion lengths of the active material and the absence of defects in nanophase materials.

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Controlled Li doping of Si nanowires by electrochemical insertion method

Cited by 96 publications

References 12 publications

Research on Advanced Materials for Li‐ion Batteries

Research on Advanced Materials for Li‐ion Batteries

Oxide‐Assisted Growth of Semiconducting Nanowires

Nanocrystalline and Thin Film Germanium Electrodes with High Lithium Capacity and High Rate Capabilities

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