scholarly journals Nanocomposite of Si/C Anode Material Prepared by Hybrid Process of High-Energy Mechanical Milling and Carbonization for Li-Ion Secondary Batteries

2018 ◽  
Vol 8 (11) ◽  
pp. 2140 ◽  
Author(s):  
Reddyprakash Maddipatla ◽  
Chadrasekhar Loka ◽  
Woo Choi ◽  
Kee-Sun Lee
Keyword(s):  
Electron Microscopy ◽  
Anode Material ◽  
Mechanical Milling ◽  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Particle Size Reduction ◽  
Milled Powders

Si/C nanocomposite was successfully prepared by a scalable approach through high-energy mechanical milling and carbonization process. The crystalline structure of the milled powders was studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). Morphology of the milled powders was investigated by Field-emission scanning electron microscopy (FE-SEM). The effects of milling time on crystalline size, crystal structure and microstructure, and the electrochemical properties of the nanocomposite powders were studied. The nanocomposite showed high reversible capacity of ~1658 mAh/g with an initial cycle coulombic efficiency of ~77.5%. The significant improvement in cyclability and the discharge capacity was mainly ascribed to the silicon particle size reduction and carbon layer formation over silicon for good electronic conductivity. As the prepared nanocomposite Si/C electrode exhibits remarkable electrochemical performance, it is potentially applied as a high capacity anode material in the lithium-ion secondary batteries.

Bismuth oxyiodide nanosheets: a novel high-energy anode material for lithium-ion batteries

2015 ◽  
Vol 51 (14) ◽  
pp. 2798-2801 ◽  
Author(s):  
Chaoji Chen ◽  
Pei Hu ◽  
Xianluo Hu ◽  
Yueni Mei ◽  
Yunhui Huang
Keyword(s):  
Thermal Treatment ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Bioi Nanosheets

Direct thermal treatment of commercial BiI3 powder leads to BiOI nanosheets as a high-capacity anode for lithium-ion batteries.

scholarly journals Synthesis and Characterization of Stable and Binder-Free Electrodes of TiO2Nanofibers for Li-Ion Batteries

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Phontip Tammawat ◽  
Nonglak Meethong
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Reversible Capacity ◽  
Electrospinning Technique ◽  
Binder Free

An electrospinning technique was used to fabricate TiO2nanofibers for use as binder-free electrodes for lithium-ion batteries. The as-electrospun nanofibers were calcined at 400–1,000°C and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM and TEM images showed that the fibers have an average diameter of ~100 nm and are composed of nanocrystallites and grains, which grow in size as the calcination temperature increases. The electrochemical properties of the nanofibers were evaluated using galvanostatic cycling and electrochemical impedance spectroscopy. The TiO2nanofibers calcined at 400°C showed higher electronic conductivity, higher discharge capacity, and better cycling performance than the nanofibers calcined at 600, 800, and 1,000°C. The TiO2nanofibers calcined at 400°C delivered an initial reversible capacity of 325 mAh·g−1approaching their theoretical value at 0.1 C rate and over 175 mAh·g−1at 0.3 C rate with limited capacity fading and Coulombic efficiency between 96 and 100%.

Study on Structure and Electrochemical Performance of LiFePO4/C Modified by PANI

2012 ◽  
Vol 512-515 ◽  
pp. 1079-1082
Author(s):  
Yu Wen Liu ◽  
Jing Na Jiang ◽  
Wei Zhang ◽  
Dong Xing Ma
Keyword(s):  
Electron Microscopy ◽  
Cathode Material ◽  
Electronic Conductivity ◽  
High Capacity ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Large Particles ◽  
Key Issues ◽  
Intrinsic Characteristic

LiFePO4 has attracted broad attention as a promising cathode material for lithium ion batteries. The key issues related to LiFePO4 performance lie on the intrinsic characteristic of poor diffusion of lithium ions through an interface between LiFePO4 and FePO4. To explore the effect of polyaniline on performances, LiFePO4/C cathode materials were prepared via hydrothermal method, using glucose as a carbon source and polyaniline as a modifier. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), galvanostatic charge–discharge test and cyclicvoltammetry (CV). The results show that the olivine-type phase of LiFePO4/C is not changed by polyanilines and LiFePO4/C is composed of relatively large particles of about 400nm and some nano-sized polyaniline particles, which favor the electronic conductivity. The LiFePO4/C cathode material modified by 10% polyaniline has the highest uniformity. It delivers the capacity of 167.9mAh/g at 0.1C, and has good reversibility and high capacity retention.

scholarly journals Enhanced Electrochemical Performance Promoted by Tin in Silica Anode Materials for Stable and High-Capacity Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1071
Author(s):  
Xuli Ding ◽  
Daowei Liang ◽  
Hongda Zhao
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Silicon Oxide ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Phase Evolution ◽  
Discharge Process

Although the silicon oxide (SiO2) as an anode material shows potential and promise for lithium-ion batteries (LIBs), owing to its high capacity, low cost, abundance, and safety, severe capacity decay and sluggish charge transfer during the discharge–charge process has caused a serious challenge for available applications. Herein, a novel 3D porous silicon oxide@Pourous Carbon@Tin (SiO2@Pc@Sn) composite anode material was firstly designed and synthesized by freeze-drying and thermal-melting self-assembly, in which SiO2 microparticles were encapsulated in the porous carbon as well as Sn nanoballs being uniformly dispersed in the SiO2@Pc-like sesame seeds, effectively constructing a robust and conductive 3D porous Jujube cake-like architecture that is beneficial for fast ion transfer and high structural stability. Such a SiO2@Pc@Sn micro-nano hierarchical structure as a LIBs anode exhibits a large reversible specific capacity ~520 mAh·g−1, initial coulombic efficiency (ICE) ~52%, outstanding rate capability, and excellent cycling stability over 100 cycles. Furthermore, the phase evolution and underlying electrochemical mechanism during the charge–discharge process were further uncovered by cyclic voltammetry (CV) investigation.

Si/SiO2 Composite Negative Electrode Material for Lithium Ion Batteries

2014 ◽  
Vol 809-810 ◽  
pp. 781-786
Author(s):  
Min Liu ◽  
Na Zhang ◽  
Feng Hui Zhao ◽  
Xiao Qin Zhao ◽  
Ke Chen ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Specific Capacity ◽  
High Capacity ◽  
Negative Electrode ◽  
Lithium Ion ◽  
High Energy ◽  
X Ray Diffraction ◽  
Ball Milling Technique

As lithium-ion battery anode materials, silicon has the highest specific capacity. In order to restrain pure silicon’s serious volume change and enhance its electrochemical performance, Si/SiO2 composites were prepared by using a convenient high energy ball-milling technique. The characteristics of the composites as anode material for rechargeable lithium-ion batteries were investigated by X-ray diffraction and scanning electron microscopy methods. The electrochemical performance of the anode material was studied, and it was found the composite anode had a high capacity of 1333 mAhg-1 in the first cycle and 400 mAhg-1 could still be obtained after 46 cycles. Such prepared materials displayed improved cycle life.

Nanosilica/carbon composite spheres as anodes in Li-ion batteries with excellent cycle stability

2015 ◽  
Vol 3 (4) ◽  
pp. 1476-1482 ◽  
Author(s):  
Mingqi Li ◽  
Yan Yu ◽  
Jing Li ◽  
Baoling Chen ◽  
Xianwen Wu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
Carbon Composite ◽  
Li Ion Batteries ◽  
Cycle Stability ◽  
Li Ion

Because of its high capacity, relatively low operation potentials, abundance and environmental benevolence, silica is a promising anode material for high-energy lithium-ion batteries.

scholarly journals Walnut-structure Si–G/C materials with high coulombic efficiency for long-life lithium ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (48) ◽  
pp. 27580-27586 ◽  
Author(s):  
Chengmao Xiao ◽  
Peng He ◽  
Jianguo Ren ◽  
Min Yue ◽  
Youyuan Huang ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Long Life ◽  
High Coulombic Efficiency

Nano-sized silicon is a potential high energy density anode material for lithium ion batteries.

CuS2 sheets: a hidden anode material with a high capacity for sodium-ion batteries

2021 ◽  
Author(s):  
Shaohua Lu ◽  
Weidong Hu ◽  
Xiaojun Hu
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Low Cost ◽  
High Capacity ◽  
Lithium Ion ◽  
Sodium Ion ◽  
Sodium Ion Batteries

Due to their low cost and improved safety compared to lithium-ion batteries, sodium-ion batteries have attracted worldwide attention in recent decades.

Superflexible C68-graphyne as a promising anode material for lithium-ion batteries

2019 ◽  
Vol 7 (29) ◽  
pp. 17357-17365 ◽  
Author(s):  
Bozhao Wu ◽  
Xiangzheng Jia ◽  
Yanlei Wang ◽  
Jinxi Hu ◽  
Enlai Gao ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Carrier Mobility ◽  
High Stability ◽  
High Capacity ◽  
Lithium Ion

A new graphyne with high stability, excellent flexibility and carrier mobility is theoretically predicted as a promising anode material for lithium-ion batteries with high capacity.

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