Constructing zigzag-like hollow mesoporous nanospheres MoO2/C with superior lithium storage performance

2021 ◽  
Author(s):  
Wencai Zhao ◽  
Y.F. Yuan ◽  
S.M. Yin ◽  
Gaoshen Cai ◽  
S.Y. Guo
Keyword(s):  
Reaction Kinetics ◽  
Discharge Capacity ◽  
Amorphous Carbon ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Structure Design ◽  
Structure Stability ◽  
Lithium Storage

Abstract Hollow mesoporous nanospheres MoO2/C are successfully constructed through metal chelating reaction between molybdenum acetylacetone and glycerol as well as the Kirkendall effect induced by diammonium hydrogen phosphate. MoO2 nanoparticles coupled by amorphous carbon are assembled to unique zigzag-like hollow mesoporous nanosphere with large specific surface area of 147.7 m2 g-1 and main pore size of 8.7 nm. The content of carbon is 9.1%. As anode material for lithium-ion batteries, the composite shows high specific capacity and excellent cycling performance. At 0.2 A g-1, average discharge capacity stabilizes at 1092 mAh g-1. At 1 A g-1 after 700 cycles, the discharge capacity still reaches 512 mAh g-1. Impressively, the composite preserves intact after 700 cycles. Even at 5 A g-1, the discharge capacity can reach 321 mAh g-1, exhibiting superior rate capability. Various kinetics analyses demonstrate that in electrochemical reaction, the proportion of the surface capacitive effect is higher, and the composite has relatively high diffusion coefficient of Li ions and fast faradic reaction kinetics. Excellent lithium storge performance is attributed to the synergistic effect of zigzag-like hollow mesoporous nanosphere and amorphous carbon, which improves reaction kinetics, structure stability and electronic conductivity of MoO2. The present work provides a new useful structure design strategy for advanced energy storage application of MoO2.

Synergistic effect between flake graphite and small-sized graphene in lithium storage

2021 ◽  
pp. 2150031
Author(s):  
Hai Li ◽  
Chunxiang Lu
Keyword(s):  
Synergistic Effect ◽  
Lithium Ion Batteries ◽  
Individual Component ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Flake Graphite ◽  
Effective Strategy ◽  
Lithium Storage

As anode material for lithium-ion batteries, graphite has the disadvantage of relatively low specific capacity. In this work, a simple yet effective strategy to overcome the disadvantages by using a composite of flake graphite (FG) and small-sized graphene (SG) has been developed. The FG/SG composite prepared by dispersing FG and SG (90:10 w/w) in ethanol and drying delivers much higher specific capacity than that of individual component except for improved rate capability. More surprisingly, FG/SG composite delivers higher reversible capacity than its theoretical value calculated according to the theoretical capacities of graphite and graphene. Therefore, a synergistic effect between FG and SG in lithium storage is clearly discovered. To explain it, we propose a model that abundant nanoscopic cavities were formed due to physical adhesion between FG and SG and could accommodate extra lithium.

scholarly journals Facile Synthesis of Sn/Nitrogen-Doped Reduced Graphene Oxide Nanocomposites with Superb Lithium Storage Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1084 ◽  
Author(s):  
Quan Sun ◽  
Ying Huang ◽  
Shi Wu ◽  
Zhonghui Gao ◽  
Hang Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Active Sites ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Discharge Process ◽  
Lithium Storage ◽  
Nitrogen Doped ◽  
Reduced Graphene

Sn/Nitrogen-doped reduced graphene oxide (Sn@N-G) composites have been successfully synthesized via a facile method for lithium-ion batteries. Compared with the Sn or Sn/graphene anodes, the Sn@N-G anode exhibits a superb rate capability of 535 mAh g−1 at 2C and cycling stability up to 300 cycles at 0.5C. The improved lithium-storage performance of Sn@N-G anode could be ascribed to the effective graphene wrapping, which accommodates the large volume change of Sn during the charge–discharge process, while the nitrogen doping increases the electronic conductivity of graphene, as well as provides a large number of active sites as reservoirs for Li+ storage.

scholarly journals The rational design of hierarchical MoS2 nanosheet hollow spheres sandwiched between carbon and TiO2@graphite as an improved anode for lithium-ion batteries

2019 ◽  
Vol 1 (5) ◽  
pp. 1957-1964 ◽  
Author(s):  
Faze Wang ◽  
Fanggang Li ◽  
Maojun Zheng ◽  
Yanbo Li ◽  
Li Ma
Keyword(s):  
Lithium Ion Batteries ◽  
Amorphous Carbon ◽  
Hollow Sphere ◽  
Rational Design ◽  
Specific Capacity ◽  
Hollow Spheres ◽  
Lithium Ion ◽  
Carbon Shell ◽  
Lithium Storage ◽  
Mos2 Nanosheet

Hierarchical MoS2 nanosheet hollow sphere is sandwiched by graphite and amorphous carbon shell, showing high reversible specific capacity and cycling stability for lithium storage.

scholarly journals Complexing Agents on Carbon Content and Lithium Storage Capacity of LiFePO4/C Cathode Synthesized via Sol-Gel Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-7
Author(s):  
C. Guan ◽  
H. Huang
Keyword(s):  
Discharge Rate ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cost Effective ◽  
Reversible Capacity ◽  
Complexing Agents ◽  
Lithium Storage ◽  
Synthesis Conditions

Olivine-structured LiFePO4faces its intrinsic challenges in terms of poor electrical conductivity and lithium-ion diffusion capability for application to lithium-ion batteries. Cost-effective sol-gel approach is advantageous to in situ synthesize carbon-coated LiFePO4(LiFePO4/C) which can not only improve electronic conductivity but also constrain particle size to nanometer scale. In this study, the key parameter is focused on the choice and amount of chelating agents in this synthesis route. It was found that stability of complexing compounds has significant impacts on the carbon contents and electrochemical properties of the products. At the favorable choice of precursors, composition, and synthesis conditions, nanocrystalline LiFePO4/C materials with appropriate amount of carbon coating were successfully obtained. A reversible capacity of 162 mAh/g was achieved at 0.2Crate, in addition to good discharge rate capability.

scholarly journals ZnFe2O4, a Green and High-Capacity Anode Material for Lithium-Ion Batteries: A Review

2021 ◽  
Vol 11 (24) ◽  
pp. 11713
Author(s):  
Marcella Bini ◽  
Marco Ambrosetti ◽  
Daniele Spada
Keyword(s):  
Lithium Ion Batteries ◽  
Broad Class ◽  
High Surface ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Rate Capability ◽  
Volume Ratio ◽  
Lithium Ion ◽  
Structural Features ◽  
Synthesis Methods

Ferrites, a broad class of ceramic oxides, possess intriguing physico-chemical properties, mainly due to their unique structural features, that, during these last 50–60 years, made them the materials of choice for many different applications. They are, indeed, applied as inductors, high-frequency materials, for electric field suppression, as catalysts and sensors, in nanomedicine for magneto-fluid hyperthermia and magnetic resonance imaging, and, more recently, in electrochemistry. In particular, ZnFe2O4 and its solid solutions are drawing scientists’ attention for the application as anode materials for lithium-ion batteries (LIBs). The main reasons are found in the low cost, abundance, and environmental friendliness of both Zn and Fe precursors, high surface-to-volume ratio, relatively short path for Li-ion diffusion, low working voltage of about 1.5 V for lithium extraction, and the high theoretical specific capacity (1072 mA h g−1). However, some drawbacks are represented by fast capacity fading and poor rate capability, resulting from a low electronic conductivity, severe agglomeration, and large volume change during lithiation/delithiation processes. In this review, the main synthesis methods of spinels will be briefly discussed before presenting the most recent and promising electrochemical results on ZnFe2O4 obtained with peculiar morphologies/architectures or as composites, which represent the focus of this review.

scholarly journals Boosting the Rate and Cycling Performance of β-LixV2O5 Nanorods for Li Ion Battery by Electrode Surface Decoration

2019 ◽  
Author(s):  
Panpan Wang ◽  
Yue Du ◽  
Baoyou Zhang ◽  
Yanxin Yao ◽  
Yuchen Xiao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ex Situ ◽  
Practical Application ◽  
Surface Decoration

The <i>β-</i>phase lithium vanadium oxide bronze (<i>β-</i>Li<i><sub>x</sub></i>V<sub>2</sub>O<sub>5</sub>) with high theoretic specific capacity up to 440 mAh g<sup>-1</sup> is considered as promising cathode materials, however, their practical application is hindered by its poor ionic and electronic conductivity, resulting in unsatisfied cyclic stability and rate capability. Herein, we report the surface decoration of <i>β-</i>Li<i><sub>x</sub></i>V<sub>2</sub>O<sub>5</sub> cathode using both reduced oxide graphene and ionic conductor LaPO<sub>4</sub>, which significantly promotes the electronic transfer and Li<sup>+</sup> diffusion rate, respectively. As a result, the rGO/LaPO<sub>4</sub>/Li<i><sub>x</sub></i>V<sub>2</sub>O<sub>5</sub> composite exhibits excellent electrochemical performance in terms of high reversible specific capacity of 275.7 mAh g<sup>-1</sup> with high capacity retention of 84.1% after 100 cycles at a current density of 60 mA g<sup>-1</sup>, and acceptable specific capacity of 170.3 mAh g<sup>-1</sup> at high current density of 400 mA g<sup>-1</sup>. The cycled electrode is also analyzed by electrochemical impedance spectroscopy, <i>ex-situ </i>X-ray diffraction and scanning electron microscope, providing further insights into the improvement of electrochemical performance. Our results provide an effective approach to boost the electrochemical properties of lithium vanadates for practical application in lithium ion batteries.

Polypyrrole-assisted synthesis of roselike MoS2/nitrogen-containing carbon/graphene hybrids and their robust lithium storage performances

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62624-62629 ◽  
Author(s):  
Zhiyan Guo ◽  
Yang Zhong ◽  
Zongwei Xuan ◽  
Changming Mao ◽  
Fanglin Du ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Lithium Storage ◽  
High Specific Capacity

MoS2/NC/G hybrids exhibit a high specific capacity, and superior rate capability for lithium ion batteries.

scholarly journals Metal–Oleate Complex-Derived Bimetallic Oxides Nanoparticles Encapsulated in 3D Graphene Networks as Anodes for Efficient Lithium Storage with Pseudocapacitance

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Yingying Cao ◽  
Kaiming Geng ◽  
Hongbo Geng ◽  
Huixiang Ang ◽  
Jie Pei ◽  
...  
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Diffusion Path ◽  
Cycling Performance ◽  
Lithium Storage ◽  
Graphene Oxides ◽  
3D Graphene ◽  
Metal Oleate ◽  
Bimetallic Oxides

Abstract In this manuscript, we have demonstrated the delicate design and synthesis of bimetallic oxides nanoparticles derived from metal–oleate complex embedded in 3D graphene networks (MnO/CoMn2O4 ⊂ GN), as an anode material for lithium ion batteries. The novel synthesis of the MnO/CoMn2O4 ⊂ GN consists of thermal decomposition of metal–oleate complex containing cobalt and manganese metals and oleate ligand, forming bimetallic oxides nanoparticles, followed by a self-assembly route with reduced graphene oxides. The MnO/CoMn2O4 ⊂ GN composite, with a unique architecture of bimetallic oxides nanoparticles encapsulated in 3D graphene networks, rationally integrates several benefits including shortening the diffusion path of Li+ ions, improving electrical conductivity and mitigating volume variation during cycling. Studies show that the electrochemical reaction processes of MnO/CoMn2O4 ⊂ GN electrodes are dominated by the pseudocapacitive behavior, leading to fast Li+ charge/discharge reactions. As a result, the MnO/CoMn2O4 ⊂ GN manifests high initial specific capacity, stable cycling performance, and excellent rate capability.

scholarly journals Electrochemical Performance Enhancement of Micro-Sized Porous Si by Integrating with Nano-Sn and Carbonaceous Materials

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 920
Author(s):  
Tiantian Yang ◽  
Hangjun Ying ◽  
Shunlong Zhang ◽  
Jianli Wang ◽  
Zhao Zhang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Amorphous Carbon ◽  
Anode Materials ◽  
Performance Enhancement ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Commercial Application ◽  
Structure Stability ◽  
Carbonaceous Materials ◽  
Porous Si

Silicon is investigated as one of the most prospective anode materials for next generation lithium ion batteries due to its superior theoretical capacity (3580 mAh g−1), but its commercial application is hindered by its inferior dynamic property and poor cyclic performance. Herein, we presented a facile method for preparing silicon/tin@graphite-amorphous carbon (Si/Sn@G–C) composite through hydrolyzing of SnCl2 on etched Fe–Si alloys, followed by ball milling mixture and carbon pyrolysis reduction processes. Structural characterization indicates that the nano-Sn decorated porous Si particles are coated by graphite and amorphous carbon. The addition of nano-Sn and carbonaceous materials can effectively improve the dynamic performance and the structure stability of the composite. As a result, it exhibits an initial columbic efficiency of 79% and a stable specific capacity of 825.5 mAh g−1 after 300 cycles at a current density of 1 A g−1. Besides, the Si/Sn@G–C composite exerts enhanced rate performance with 445 mAh g−1 retention at 5 A g−1. This work provides an approach to improve the electrochemical performance of Si anode materials through reasonable compositing with elements from the same family.

Interlayer expansion of few-layered Mo-doped SnS2 nanosheets grown on carbon cloth with excellent lithium storage performance for lithium ion batteries

2017 ◽  
Vol 5 (8) ◽  
pp. 4075-4083 ◽  
Author(s):  
Qiang Chen ◽  
Fengqi Lu ◽  
Ying Xia ◽  
Hai Wang ◽  
Xiaojun Kuang
Keyword(s):  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Carbon Cloth ◽  
Initial Discharge Capacity ◽  
Lithium Storage ◽  
Storage Performance ◽  
Initial Discharge

Mo-doped SnS2 nanosheets supported on carbon cloth are synthesized. The nanosheets, as additive-free integrated electrodes for LIBs, exhibit a high initial discharge capacity, superior cycling performance and rate capability.

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