A Low-Cost Nano/Micro Structured-Silicon-MWCNTs from Nano-Silica for Lithium Storage

NANO ◽  
2016 ◽  
Vol 11 (03) ◽  
pp. 1650031 ◽  
Author(s):  
Xuejiao Feng ◽  
Tengda Ding ◽  
Hongmin Cui ◽  
Nanfu Yan ◽  
Fei Wang
Keyword(s):  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Micro Structure ◽  
Rechargeable Lithium Batteries ◽  
Lithium Storage ◽  
Capacity Retention ◽  
Industrial Processing ◽  
Long Cycle Life ◽  
Si Nanoparticles ◽  
Multiwall Carbon

Despite the fact that silicon material can be synthesized from various sources, deriving them from silica resources is of strategic significance for the industrial processing. Here a low-cost nano/micro structure of Si–CNT was derived from nano-SiO2 and multiwall carbon nanotubes (MWCNTs) with simple methods. By employing table salt (NaCl) as a heat scavenger for the magnesiothermic reduction, the nano/micro structure of the material was remained effective. Comparing to ball milling, a combination of SiO2, MWCNTs and NaCl by spray drying achieved the long cycle life for Si–CNT composite. This material presented a stable capacity above 968.1[Formula: see text]mAh g[Formula: see text] with excellent capacity retention of 85.4% at the 150th cycle versus the 2nd one. The Si nanoparticles, very small particle size in 10–20[Formula: see text]nm, homogenously dispersed in electronically conductive network of MWCNTS, which accommodate the volume change of Si and reinforce highly conductivity of the Si–CNT composite during repeated cycles. Combined with its low-cost and up-scaling technologies, Si–CNT composite is a promising anode material in rechargeable lithium batteries with high electrochemical performance.

Simple, low-cost, water-processable n -type thermoelectric composite films from multiwall carbon nanotubes in polyvinylpyrrolidone

2017 ◽  
Vol 225 ◽  
pp. 86-92 ◽  
Author(s):  
Ruben Sarabia-Riquelme ◽  
John Craddock ◽  
E. Ashley Morris ◽  
David Eaton ◽  
Rodney Andrews ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Low Cost ◽  
Composite Films ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon

Nitrogen-Doped Multiwall Carbon Nanotubes for Lithium Storage with Extremely High Capacity

Nano Letters ◽  
2012 ◽  
Vol 12 (5) ◽  
pp. 2283-2288 ◽  
Author(s):  
Weon Ho Shin ◽  
Hyung Mo Jeong ◽  
Byung Gon Kim ◽  
Jeung Ku Kang ◽  
Jang Wook Choi
Keyword(s):  
Carbon Nanotubes ◽  
High Capacity ◽  
Multiwall Carbon Nanotubes ◽  
Lithium Storage ◽  
Nitrogen Doped ◽  
Multiwall Carbon

scholarly journals Nanopurification of silicon from 84% to 99.999% purity with a simple and scalable process

2015 ◽  
Vol 112 (44) ◽  
pp. 13473-13477 ◽  
Author(s):  
Linqi Zong ◽  
Bin Zhu ◽  
Zhenda Lu ◽  
Yingling Tan ◽  
Yan Jin ◽  
...  
Keyword(s):  
Ball Milling ◽  
High Purity ◽  
High Performance ◽  
Low Cost ◽  
Reversible Capacity ◽  
Absorption Enhancement ◽  
Low Grade ◽  
Long Cycle Life ◽  
Si Nanoparticles ◽  
Breaking Points

Silicon, with its great abundance and mature infrastructure, is a foundational material for a range of applications, such as electronics, sensors, solar cells, batteries, and thermoelectrics. These applications rely on the purification of Si to different levels. Recently, it has been shown that nanosized silicon can offer additional advantages, such as enhanced mechanical properties, significant absorption enhancement, and reduced thermal conductivity. However, current processes to produce and purify Si are complex, expensive, and energy-intensive. Here, we show a nanopurification process, which involves only simple and scalable ball milling and acid etching, to increase Si purity drastically [up to 99.999% (wt %)] directly from low-grade and low-cost ferrosilicon [84% (wt %) Si; ∼$1/kg]. It is found that the impurity-rich regions are mechanically weak as breaking points during ball milling and thus, exposed on the surface, and they can be conveniently and effectively removed by chemical etching. We discovered that the purity goes up with the size of Si particles going down, resulting in high purity at the sub–100-nm scale. The produced Si nanoparticles with high purity and small size exhibit high performance as Li ion battery anodes, with high reversible capacity (1,755 mAh g−1) and long cycle life (73% capacity retention over 500 cycles). This nanopurification process provides a complimentary route to produce Si, with finely controlled size and purity, in a diverse set of applications.

scholarly journals Low-Cost Chitosan-Derived N-Doped Carbons Boost Electrocatalytic Activity of Multiwall Carbon Nanotubes

2018 ◽  
Vol 28 (16) ◽  
pp. 1707284 ◽  
Author(s):  
Mo Qiao ◽  
Seyyed Shayan Meysami ◽  
Guillermo Alvarez Ferrero ◽  
Fei Xie ◽  
Han Meng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrocatalytic Activity ◽  
Low Cost ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon

scholarly journals Nitrogen and boron doped carbon layer coated multiwall carbon nanotubes as high performance anode materials for lithium ion batteries

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bo Liu ◽  
Xiaolei Sun ◽  
Zhongquan Liao ◽  
Xueyi Lu ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
Active Sites ◽  
High Performance ◽  
Multiwall Carbon Nanotubes ◽  
Lithium Ion ◽  
Carbon Layer ◽  
Lithium Storage ◽  
Boron Doped ◽  
Multiwall Carbon

AbstractLithium ion batteries (LIBs) are at present widely used as energy storage and conversion device in our daily life. However, due to the limited power density, the application of LIBs is still restricted in some areas such as commercial vehicles or heavy-duty trucks. An effective strategy to solve this problem is to increase energy density through the development of battery materials. At the same time, a stable long cycling battery is a great demand of environmental protection and industry. Herein we present our new materials, nitrogen and boron doped carbon layer coated multiwall carbon nanotubes (NBC@MWCNTs), which can be used as anodes for LIBs. The electrochemical results demonstrate that the designed NBC@MWCNTs electrode possesses high stable capacity over an ultra-long cycling lifespan (5000 cycles) and superior rate capability even at very high current density (67.5 A g−1). Such impressive lithium storage properties could be ascribed to the synergistic coupling effect of the distinctive structural features, the reduced diffusion length of lithium ions, more active sites generated by doped atoms for lithium storage, as well as the enhancement of the electrode structural integrity. Taken together, these results indicate that the N, B-doped carbon@MWCNTs materials may have great potential for applications in next-generation high performance rechargeable batteries.

Structure and Characteristics of Carbon Nanotube Reinforced SiC Composite

2017 ◽  
Vol 726 ◽  
pp. 127-131 ◽  
Author(s):  
Qiang Li ◽  
You Jun Zheng ◽  
Jin Feng Xia ◽  
Dan Yu Jiang
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Multiwall Carbon Nanotubes ◽  
Micro Structure ◽  
Reinforced Composite ◽  
Sic Composites ◽  
Modified Carbon Nanotubes ◽  
The Relationship ◽  
Multiwall Carbon

Carbon nanotube plays an important role in various applications due to its extreme optic, electronic and mechanical properties. In the present work, attempts have made to investigate the effects of incorporation of multiwall carbon nanotubes (MWNTs) on microstructure and mechanical properties of SiC composites. Firstly, carbon nanotubes were modified by chemical method in order to add carboxyl group on their surface. Then modified carbon nanotubes were located on the surface on SiC particles by silicon coupling agent. A designed carbon nanotube reinforced composite was obtained after pressureless sintering. SEM was employed to investigate the micro-structure of as-prepared SiC material. Its properties of, such as density, hardness, strength, etc. were determined in detail. The relationship between the micro-structure and properties of carbon nanotube reinforced SiC composite were discussed.

MnWO4 nanoparticles as advanced anodes for lithium-ion batteries: F-doped enhanced lithiation/delithiation reversibility and Li-storage properties

Nanoscale ◽  
2018 ◽  
Vol 10 (15) ◽  
pp. 6832-6836 ◽  
Author(s):  
Wei Wang ◽  
Na Wu ◽  
Jin-Ming Zhou ◽  
Feng Li ◽  
Yu Wei ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Nano Particles ◽  
Lithium Storage ◽  
Capacity Retention ◽  
Long Cycle Life ◽  
Storage Performance ◽  
High Theoretical Capacity ◽  
Storage Properties ◽  
Li Storage

F-Doped MnWO4 nano-particles were prepared and showed superior lithium storage performance with a high theoretical capacity and a long cycle life, as demonstrated by a capacity retention of more than 85% after cycling for 150 cycles.

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

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