scholarly journals The Synthesis and Electrochemical Performance of Si Composite with Hollow Carbon Microtubes by the Carbonization of Milkweed from Nature as Anode Template for Lithium Ion Batteries

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5124
Author(s):  
Eun Hyuk Chung ◽  
Jong Pil Kim ◽  
Hyun Gyu Kim ◽  
Jae-Min Chung ◽  
Sei-Jin Lee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Electrochemical Performance ◽  
Pore Size ◽  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Lithium Ion ◽  
Size Analysis ◽  
Pore Size Analysis ◽  
Hollow Carbon

It has been reported that improving electrical conductivity and maintaining stable structure during discharge/charge process are challenge for Si to be used as an anode for lithium ion batteries (LIB). To address this problem, milkweed (MW) was carbonized to prepare hollow carbon microtubes (HCMT) derived from biomass as an anode template for LIB. In order to improve electrical conductivity, various materials such as chitosan (CTS), agarose, and polyvinylidene fluoride (PVDF) are used as carbon source (C1, C2, and C3) by carbonization. Carbon coated HCMT@Si composits, HCMT@Si@C1, HCMT@Si@C1@C2, and HCMT@Si@C1@C3, have been successfully synthesized. Changes in structure and crystallinity of HCMT@Si composites were characterized by using X-ray diffraction (XRD). Specific surface area for samples was calculated by using BET (Brunauer–Emmett–Teller). Also, pore size and particle size were obtained by particle and pore size analysis system. The surface morphology was evaluated using high resolution scanning electron microscopy (HR-SEM), Field Emission transmission electron microscopy (TEM). The thermal properties of HCMT@Si composites were analyzed by thermogravimetric analysis (TGA). Our research was performed to study the synthesis and electrochemical performance of Si composite with HCMT by the carbonization of natural micro hollow milkweed to form an inner space. After carbonization at 900 °C for 2 h in N2 flow, inner diameter of HCMT obtained was about 10 μm. The electrochemical tests indicate that HCMT@Si@C1@C3 exhibits discharge capacity of 932.18 mAh/g at 0.5 A/g after 100 cycles.

scholarly journals Centrifugally Spun α-Fe2O3/TiO2/Carbon Composite Fibers as Anode Materials for Lithium-Ion Batteries

2019 ◽  
Vol 9 (19) ◽  
pp. 4032 ◽  
Author(s):  
Luis Zuniga ◽  
Gabriel Gonzalez ◽  
Roberto Orrostieta Chavez ◽  
Jason C. Myers ◽  
Timothy P. Lodge ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Fiber ◽  
Carbon Composite ◽  
Composite Fibers ◽  
X Ray ◽  
Binder Free

We report results on the electrochemical performance of flexible and binder-free α-Fe2O3/TiO2/carbon composite fiber anodes for lithium-ion batteries (LIBs). The composite fibers were produced via centrifugal spinning and subsequent thermal processing. The fibers were prepared from a precursor solution containing PVP/iron (III) acetylacetonate/titanium (IV) butoxide/ethanol/acetic acid followed by oxidation at 200 °C in air and then carbonization at 550 °C under flowing argon. The morphology and structure of the composite fibers were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). These ternary composite fiber anodes showed an improved electrochemical performance compared to the pristine TiO2/C and α-Fe2O3/C composite fiber electrodes. The α-Fe2O3/TiO2/C composite fibers also showed a superior cycling performance with a specific capacity of 340 mAh g−1 after 100 cycles at a current density of 100 mA g−1, compared to 61 mAh g−1 and 121 mAh g−1 for TiO2/C and α-Fe2O3/C composite electrodes, respectively. The improved electrochemical performance and the simple processing of these metal oxide/carbon composite fibers make them promising candidates for the next generation and cost-effective flexible binder-free anodes for LIBs.

scholarly journals Effect of stress on electrochemical performance of hollow carbon-coated silicon snode in lithium ion batteries

2019 ◽  
Vol 68 (12) ◽  
pp. 120201
Author(s):  
Feng-Nan Sun ◽  
Lu Feng ◽  
Jia-He Bu ◽  
Jing Zhang ◽  
Lin-An Li ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Carbon Coated ◽  
Hollow Carbon

Synthesis of Li3V2(PO4)3/C for use as the cathode material in lithium ion batteries using polyvinylidene fluoride as the source of carbon

2015 ◽  
Vol 39 (4) ◽  
pp. 2627-2632 ◽  
Author(s):  
Lingfang Li ◽  
Changling Fan ◽  
Xiang Zhang ◽  
Taotao Zeng ◽  
Weihua Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Polyvinylidene Fluoride ◽  
Carbon Film ◽  
Lithium Ion ◽  
Thin Carbon ◽  
Thin Carbon Film

The Li3V2(PO4)3/C cathode, prepared using PVDF as the source of carbon, is covered by a thin carbon film and has an excellent conductivity and electrochemical performance.

Self-assembled 3D flower-like Fe3O4/C architecture with superior lithium ion storage performance

2018 ◽  
Vol 6 (48) ◽  
pp. 24940-24948 ◽  
Author(s):  
Lijia Wan ◽  
Dong Yan ◽  
Xingtao Xu ◽  
Jiabao Li ◽  
Ting Lu ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Stable Structure ◽  
Storage Performance ◽  
Ion Storage ◽  
Self Assembled

3D flower-like Fe3O4/C with a stable structure, improved electrical conductivity, and excellent kinetic performance exhibits superior electrochemical performance for lithium-ion batteries.

scholarly journals EG-Assisted Synthesis and Electrochemical Performance of Ultrathin Carbon-Coated LiMnPO4Nanoplates as Cathodes in Lithium Ion Batteries

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Liwei Su ◽  
Yali Sha ◽  
Jingkang Jiang ◽  
Lianbang Wang ◽  
Yuanhao Wang
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Electrochemical Behaviors ◽  
X Ray ◽  
Pyrolysis Method ◽  
Transmission Electron ◽  
Carbon Coated

Ultrathin carbon-coated LiMnPO4(ULMP/C) nanoplates were prepared through an ethylene glycol- (EG-) assisted pyrolysis method. Different from most of LiMnPO4/C works, the obtained ULMP/C possessed relatively small particle size (less than 50 nm in thickness) and preferable carbon coating (~1 nm in thickness, 2 wt.%). As a reference, LiMnPO4/C (LMP/C) composites were also fabricated via the traditional hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), thermogravimetric analysis (TG), galvanostatic charge-discharge, and cyclic voltammetry (CV) were performed to characterize the crystalline phase, morphology, structure, carbon content, and electrochemical behaviors of samples. The electrochemical performance of bare and carbon-coated LiMnPO4was evaluated as cathodes in lithium ion batteries. As a result, the obtained ULMP/C nanoplates demonstrated much higher reversible capacities (110.9 mAh g−1after 50 cycles at 0.1 C) and rate performances than pure LMP and LMP/C composites. This facile and efficient EG-assisted pyrolysis method can enlighten us on exploiting advanced routes to modify active materials with ultrathin and homogeneous carbon layers.

NANOSTRUCTURED Si/ZrO2 MESOPOROUS COMPOSITE FILM ANODES FOR LITHIUM ION BATTERIES

2009 ◽  
Vol 02 (01) ◽  
pp. 23-26 ◽  
Author(s):  
X. L. WANG ◽  
J. P. TU ◽  
J. Y. XIANG ◽  
X. H. HUANG
Keyword(s):  
Electrochemical Performance ◽  
Composite Film ◽  
Pore Size ◽  
Lithium Ion Batteries ◽  
Volume Change ◽  
Lithium Ion ◽  
Lithium Ions ◽  
Mesoporous Composite ◽  
20 Nm ◽  
Nanostructured Si

Mesoporous ZrO 2 with pore sizes of 5–20 nm were prepared using various structure-directing agents. Nanoscale Si was combined with mesoporous ZrO 2 to be used as anodes for lithium ion batteries. In the range of the Si / ZrO 2 mole ratio from 1:1 to 6:1, electrochemical investigations indicated that the mesoporous composite film with the mole ratio of 4:1 had larger capacity and better cyclability upon cycling. Its discharge capacity preserved 1251 mAh/g after 50 cycles. It is believed that mesoporous ZrO 2 could effectively alleviate the volume change arising from Li – Si alloying during the lithiation/delithiation process and provided channels with its mesopores for lithium ions passing through. The Si / ZrO 2 composite film with a pore size of 20 nm presented the best electrochemical performance, indicating that the larger mesopores could facilitate insertion/removal of lithium ions.

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