A novel approach to prepare Si/C nanocomposites with yolk–shell structures for lithium ion batteries

RSC Advances ◽  
2014 ◽  
Vol 4 (68) ◽  
pp. 36218-36225 ◽  
Author(s):  
Huan-Huan Li ◽  
Jia-Wei Wang ◽  
Xing-Long Wu ◽  
Hai-Zhu Sun ◽  
Feng-Mei Yang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Shell Structure ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Shell Structures ◽  
Structured Materials ◽  
Novel Approach ◽  
Novel Method ◽  
Good Retention

A novel method was developed to prepare mesoporous Si/C nanocomposites with yolk–shell structure (MSi@C), which showed good retention of specific capacity (1264.7 mA h g−1 after 150 cycles with coulombic efficiency above 99%). This work provides an alternative method to fabricate yolk–shell structured materials.

SnSe/Cu2SnSe3 Heterojunction Structure with High Initial Coulombic Efficiency for Lithium-Ion Battery Anodes

2022 ◽  
Vol 905 ◽  
pp. 135-141
Author(s):  
Bao Juan Yang ◽  
Rui Xia ◽  
Su Bin Jiang ◽  
Mei Zhen Gao
Keyword(s):  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Diffusion Path ◽  
Thermal Method ◽  
Tin Selenide ◽  
Ion Doping ◽  
Initial Coulombic Efficiency

Due to high theoretical specific capacity and abundant reserves, tin selenide-based materials have received tremendous attentions in the fields of lithium-ion batteries. Nevertheless, the huge volume changes during insertion/de-intercalation processes deteriorate the Coulombic Efficiency greatly. In order to solve it, the researchers have made great efforts by means of controlling nanoparticles granularity, carbon coating, ion doping et al. In this study, SnSe/Cu2SnSe3 heterojunction nanocomposites were synthesized by solvo-thermal method. The resulting SnSe/Cu2SnSe3 is a three-dimensional flower-like hierarchical nanostructure composed of nanoscale thin lamellae of a thickness of 8-12 nm. The unique nanostructure could shorten the diffusion path of lithium ions and expedite charge transfer, and therefore enhance the reaction kinetics. Compared with SnSe, the initial Coulombic efficiency of SnSe/Cu2SnSe3 is raised from 59% to 90% as the anode material of lithium-ion batteries.

Enhancing the performance of Li3VO4 by combining nanotechnology and surface carbon coating for lithium ion batteries

2015 ◽  
Vol 3 (21) ◽  
pp. 11253-11260 ◽  
Author(s):  
Gaoqi Shao ◽  
Lin Gan ◽  
Ying Ma ◽  
Huiqiao Li ◽  
Tianyou Zhai
Keyword(s):  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Carbon Coating ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Surface Carbon ◽  
Conductive Additive ◽  
Carbon Coated ◽  
Coating Layers

Carbon-coated nanosized Li3VO4 was successfully obtained by combination of ball milling and CVD techniques. The thin and full coating layers of carbon can greatly decrease the amount of conductive additive in the electrode and enhance the first coulombic efficiency, specific capacity and rate performances of Li3VO4.

scholarly journals Silicon-Nanographite Aerogel-Based Anodes for High Performance Lithium Ion Batteries

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Manisha Phadatare ◽  
Rohan Patil ◽  
Nicklas Blomquist ◽  
Sven Forsberg ◽  
Jonas Örtegren ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Large Scale ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Life Cycles ◽  
Scale Production ◽  
Silicon Anodes

Abstract To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity. One of the main challenges for silicon anodes are large volume variations during the lithiation processes. Recently, several high-performance schemes have been demonstrated with increased life cycles utilizing nanomaterials such as nanoparticles, nanowires, and thin films. However, a method that allows the large-scale production of silicon anodes remains to be demonstrated. Herein, we address this question by suggesting new scalable nanomaterial-based anodes. Si nanoparticles were grown on nanographite flakes by aerogel fabrication route from Si powder and nanographite mixture using polyvinyl alcohol (PVA). This silicon-nanographite aerogel electrode has stable specific capacity even at high current rates and exhibit good cyclic stability. The specific capacity is 455 mAh g−1 for 200th cycles with a coulombic efficiency of 97% at a current density 100 mA g−1.

scholarly journals Cobalt Sulfide Confined in N-Doped Porous Branched Carbon Nanotubes for Lithium-Ion Batteries

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongsheng Zhou ◽  
Yingchun Zhu ◽  
Bingshe Xu ◽  
Xueji Zhang ◽  
Khalid A. Al-Ghanim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
Large Scale ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cobalt Sulfide ◽  
Energy Storage Devices ◽  
A Current

Abstract Lithium-ion batteries (LIBs) are considered new generation of large-scale energy-storage devices. However, LIBs suffer from a lack of desirable anode materials with excellent specific capacity and cycling stability. In this work, we design a novel hierarchical structure constructed by encapsulating cobalt sulfide nanowires within nitrogen-doped porous branched carbon nanotubes (NBNTs) for LIBs. The unique hierarchical Co9S8@NBNT electrode displayed a reversible specific capacity of 1310 mAh g−1 at a current density of 0.1 A g−1, and was able to maintain a stable reversible discharge capacity of 1109 mAh g−1 at a current density of 0.5 A g−1 with coulombic efficiency reaching almost 100% for 200 cycles. The excellent rate and cycling capabilities can be ascribed to the hierarchical porosity of the one-dimensional Co9S8@NBNT internetworks, the incorporation of nitrogen doping, and the carbon nanotube confinement of the active cobalt sulfide nanowires offering a proximate electron pathway for the isolated nanoparticles and shielding of the cobalt sulfide nanowires from pulverization over long cycling periods.

Mesoporous silica nanoparticles as high performance anode materials for lithium-ion batteries

2016 ◽  
Vol 40 (10) ◽  
pp. 8202-8205 ◽  
Author(s):  
Yourong Wang ◽  
Kai Xie ◽  
Xu Guo ◽  
Wei Zhou ◽  
Guangsen Song ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Mesoporous Silica Nanoparticles ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Specific Capacity ◽  
Good Cycling Stability

A mesoporous nano-SiO2 anode delivers high specific capacity, good cycling stability and high Coulombic efficiency.

scholarly journals Development of a flexible anode for lithium-ion batteries from electrospun carbon-magnetite composite microfibers

2021 ◽  
Author(s):  
Carlos Andrés Velásquez Marquez ◽  
Ferley Alejandro Vásques Arroyave ◽  
Mónica Lucía Álvarez Láinez ◽  
Andrés Felipe Zapata González ◽  
Jorge Andrés Calderón Gutiérrez
Keyword(s):  
Composite Material ◽  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Homogeneous Distribution ◽  
Electrochemical Tests ◽  
Fe3o4 Nps ◽  
Free Material

The development of a binder-free material is gaining ground as a flexible anode in lithium-ion batteries due to the higher specific capacity and possibilities of usage in portable appliances. In this work, magnetite nanoparticles (Fe3O4-NPs) were incorporated into carbon microfibers (CMFs) by electrospinning technique to improve the specific capacity of active material, retaining the high flexibility of the CMFs. The composite active material (CMFs-Fe3O4) was characterized by Raman spectroscopy, Thermogravimetric analyses (TGA), and transmission electron microscopy (TEM) to determine the composition, structure, and morphology of the composite. Electrochemical tests were done to evaluate the performance of the composite material as an anode in lithium-ion batteries. Fe3O4-NPs with particle sizes from 30 to 40 nm were incorporated into CMFs (800 nm), and the TEM images showed a homogeneous distribution of Fe3O4-NPs. The electrochemical tests evidenced that magnetite incorporation increases the specific capacity by 42% on the first cycle and 20% on the 50th cycle. Similarly, the Coulombic efficiency increases by 20% in the composite material.

scholarly journals A novel method for preparing α-LiFeO2 nanorods for high-performance lithium-ion batteries

Ionics ◽  
2019 ◽  
Vol 26 (2) ◽  
pp. 1057-1061
Author(s):  
Youzuo Hu ◽  
Xingquan Liu
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Performance ◽  
Hydrothermal Process ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Ion Diffusion ◽  
Novel Method ◽  
Lithium Ion Diffusion

AbstractOne-dimensional (1D) α-LiFeO2 nanorods are successfully prepared via a low-temperature solid-state reaction from α-FeOOH nanorods synthesized by hydrothermal process and used as cathode materials in lithium-ion batteries. As cathode material for lithium-ion batteries, the nanorods can achieve a high initial specific capacity of 165.85 mAh/g at 0.1 C for which a high capacity retention of 81.65% can still be obtained after 50 cycles. The excellent performance and cycling stability are attributed to the unique 1D nanostructure, which facilitates the rapid electron exchange and fast lithium-ion diffusion between electrolyte and cathode materials.

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.

Effect of Fluorine-Containing Additive on the Electrochemical Properties of Silicon Anode for Lithium-Ion Batteries

2019 ◽  
Vol 944 ◽  
pp. 699-704 ◽  
Author(s):  
Jing Wang ◽  
Xiao Hang Yang ◽  
Yue Feng Su ◽  
Shi Chen ◽  
Feng Wu
Keyword(s):  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Solid Electrolyte Interphase ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Silicon Anode ◽  
Cycle Stability ◽  
Promising Candidate ◽  
Sem Images ◽  
The Stability

Silicon anode is a promising candidate as an alternative to the conventional graphitic anode in lithium-ion batteries. In this work, silicon anode is modified by NH4F using a facile method in air. The concentration of NH4F on the electrochemical performance is systematically checked. The 5wt%NH4F-modified silicon anode exhibits enhanced cycle and rate performances, the first discharge specific capacity is 3958 mAh·g-1 with 86.45% as the coulombic efficiency at 0.4A·g-1. The capacity can maintain at 703.3 mAh·g-1 after 50 cycles, exhibiting a much better cycle stability than pristine silicon anode (329.9 mAh·g-1 after 50 cycles). SEM images confirm that NH4F can alleviate the volume expansion of silicon since LiF can be generated at the surface which is beneficial to the stability of solid-electrolyte interphase (SEI).

A scalable ternary SnO2–Co–C composite as a high initial coulombic efficiency, large capacity and long lifetime anode for lithium ion batteries

2018 ◽  
Vol 6 (16) ◽  
pp. 7206-7220 ◽  
Author(s):  
Tao Liang ◽  
Renzong Hu ◽  
Houpo Zhang ◽  
Hanyin Zhang ◽  
Hui Wang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Large Capacity ◽  
Long Lifetime ◽  
Initial Coulombic Efficiency

A new ternary SnO2–Co–C composite has been synthesized by facile and scalable ball milling, which demonstrates a high initial coulombic efficiency (ICE, with average of 80.8%), high reversible specific capacity and a long lifetime (610 mA h g−1 after 1000 cycles at 2 A g−1).

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