scholarly journals Electrospun Li3V2(PO4)3/carbon nanofiber as cathode materials for the high-performance lithium-ion batteries

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Mengxi Zhao ◽  
Zhongpei Lu ◽  
Lin Chen ◽  
Xuefan Jiang ◽  
Fan Yin ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Composite Nanofibers ◽  
Carbon Nanofiber ◽  
High Current Density ◽  
Lithium Ion ◽  
High Current ◽  
Electrospinning Method ◽  
Different Temperatures ◽  
Initial Capacity

In this paper, a series of Li3V2(PO4)3/C composite nanofibers is prepared by a facile and environmentally friendly electrospinning method and calcined under different temperatures. The LVP nanofiber calcined under 900 ℃ exhibits the best electrochemical performance. The bicontinuous morphologies of LVP/CNF are the fibers shrunk and the LVP crystals simultaneously grown. At the range of 3.0–4.3 V, LVP/CNF obtained under 900 ℃ delivers the initial capacity of 135 mAh/g, close to the theoretical capacity of LVP. Even at high current density, the sample of LVP/CNF still presents good electrochemical performance.

Fabrication of CoFe2O4 and NiFe2O4 nanoporous spheres as promising anodes for high performance lithium-ion batteries

2017 ◽  
Vol 41 (24) ◽  
pp. 15501-15507 ◽  
Author(s):  
Deming Li ◽  
Guangda Li ◽  
Huaiyun Ge ◽  
Jianhua Zhang ◽  
Xiangeng Meng
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Lithium Ion ◽  
High Current ◽  
Simple Method ◽  
Cycling Life ◽  
Nanoporous Structures

Nanoporous CoFe2O4 and NiFe2O4 spheres have been prepared using a simple method; these nanoporous structures can improve the electrochemical performance of LIBs and exhibit long cycling life at high current density.

scholarly journals N-Doped Carbon Boosted the Formation of Few-Layered MoS2 for High-Performance Lithium and Sodium Storage

2021 ◽  
Vol 8 ◽  
Author(s):  
Junfeng Li ◽  
Xianzi Zhou ◽  
Kai Lu ◽  
Chao Ma ◽  
Liang Li ◽  
...  
Keyword(s):  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Low Cost ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Molybdenum Sulfide ◽  
High Current ◽  
High Theoretical Capacity ◽  
Sodium Storage

Molybdenum sulfide (MoS2) has become a potential anode of lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its high theoretical capacity and low cost. However, the volume expansion, poor electrical conductivity and dissolution of polysulfides in the electrolyte during the cycling process severely limited its applications. Herein, few-layered MoS2@N-doped carbon (F-MoS2@NC) was synthesized through a facile solvothermal and annealing process. It was found that the addition of N-doped carbon precursor could significantly promote the formation of few-layered MoS2 and improve the performances of lithium and sodium storage. A high reversible capacity of 482.6 mA h g−1 at a high current density of 2000 mA g−1 could be obtained for LIBs. When used as anode material for SIBs, F-MoS2@NC hybrids could maintain a reversible capacity of 171 mA h g−1 at a high current density of 1,000 mA g−1 after 600 cycles. This work should provide new insights into carbon hybrid anode materials for both LIBs and SIBs.

scholarly journals Facile Synthesis of FeS@C Particles Toward High-Performance Anodes for Lithium-Ion Batteries

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1467
Author(s):  
Xuanni Lin ◽  
Zhuoyi Yang ◽  
Anru Guo ◽  
Dong Liu
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
High Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
High Energy ◽  
High Energy Density ◽  
Hierarchical Porous

High energy density batteries with high performance are significantly important for intelligent electrical vehicular systems. Iron sulfurs are recognized as one of the most promising anodes for high energy density lithium-ion batteries because of their high theoretical specific capacity and relatively stable electrochemical performance. However, their large-scale commercialized application for lithium-ion batteries are plagued by high-cost and complicated preparation methods. Here, we report a simple and cost-effective method for the scalable synthesis of nanoconfined FeS in porous carbon (defined as FeS@C) as anodes by direct pyrolysis of an iron(III) p-toluenesulfonate precursor. The carbon architecture embedded with FeS nanoparticles provides a rapid electron transport property, and its hierarchical porous structure effectively enhances the ion transport rate, thereby leading to a good electrochemical performance. The resultant FeS@C anodes exhibit high reversible capacity and long cycle life up to 500 cycles at high current density. This work provides a simple strategy for the mass production of FeS@C particles, which represents a critical step forward toward practical applications of iron sulfurs anodes.

Porous CuCo2O4 nanocubes wrapped by reduced graphene oxide as high-performance lithium-ion battery anodes

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6551-6556 ◽  
Author(s):  
Wenpei Kang ◽  
Yongbing Tang ◽  
Wenyue Li ◽  
Zhangpeng Li ◽  
Xia Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Battery ◽  
Reduced Graphene Oxide ◽  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Lithium Ion ◽  
High Current ◽  
Reduced Graphene ◽  
Graphene Oxide Sheets

Porous CuCo2O4 nanocubes well wrapped by reduced graphene oxide sheets were facilely prepared and they showed impressive performance at high current density as the anode material of a lithium ion battery.

Electrochemical controllable synthesis of MnO2 as cathode of rechargeable Zinc-ion battery

2020 ◽  
Vol 13 (03) ◽  
pp. 2050011
Author(s):  
Xiaoyong Fan ◽  
Huan Yang ◽  
Kefan Ni ◽  
Jiaxing Han ◽  
Yan Wu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Current Density ◽  
Low Cost ◽  
High Capacity ◽  
Zinc Ion ◽  
High Current ◽  
Controllable Synthesis ◽  
Nanosheet Arrays ◽  
Different Temperatures ◽  
High Theoretical Capacity

MnO2 has been considered as an ideal cathode for rechargeable zinc-ion battery due to its high theoretical capacity and low cost. Its electrochemical performance is strongly dependent on the crystal structure and morphology. In this work, MnO2 films are electrochemically synthesized through anodic electrodepositing at different temperatures. Their morphology evolves from nanofibers assembled pompons to nanosheet arrays upon increasing electrodepositing temperature. When evaluated as cathode of rechargeable zinc-ion battery, the MnO2 film electrode electrodeposited at 10∘C displays the best electrochemical performance due to this it shows the best morphology and electrode/electrolyte interphase stability. It can stably cycle over 1000 cycles and remains a high capacity of 102[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 1.8[Formula: see text]A[Formula: see text]g[Formula: see text], and a capacity of 80[Formula: see text]mAh[Formula: see text]g[Formula: see text] at high current density of 4.5[Formula: see text]A[Formula: see text]g[Formula: see text]. This work provides a new direction to prepare MnO2 electrode with stable electrochemical cyclability.

Facile approach to thin polypyrrole encapsulation of lamellar iron (II) selenide with much improved performance for lithium-ion storage

2020 ◽  
Vol 13 (08) ◽  
pp. 2050041
Author(s):  
Yue Wang ◽  
Jiangcun Li ◽  
Xusheng Wang ◽  
Chao Wang ◽  
Jitao Chen
Keyword(s):  
Electrochemical Performance ◽  
Discharge Capacity ◽  
High Performance ◽  
High Current Density ◽  
Rate Capability ◽  
Lithium Ion ◽  
Simple Method ◽  
Ion Storage ◽  
Improved Performance ◽  
Enhanced Electrochemical Performance

A facile approach is developed to fabricate polypyrrole-encapsulated lamellar iron (II) selenide (FeSe/PPy) by directly exposing FeSe to pyrrole atmosphere at room temperature. A high FeSe loading of 97 wt.% is achieved for the FeSe/PPy composite, which is designed as an anode for lithium-ion battery (LIB) with much enhanced electrochemical performance than that of the FeSe sample. The FeSe/PPy electrodes demonstrate a reversible discharge capacity of 274 mAh g[Formula: see text] after 50 cycles at a high current density of 0.5 A g[Formula: see text], whereas the lower discharge capacity of 124 mAh g[Formula: see text] for the FeSe electrodes. The FeSe/PPy electrodes also deliver greater rate capability compared to the FeSe electrodes. The improved electrochemical performance should be assigned to the contributions of fast charge transfer and structural defense from the encapsulated PPy. Hence, the FeSe/PPy composite could serve the purpose for constructing reliable anode for LIB, and the simple method of PPy coating can also be used to build high-performance electrodes for other battery systems.

scholarly journals Impact of Microstructure on the Electrochemical Performance of Round-Shaped Pitch-Based Graphite Fibers

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1933
Author(s):  
Baoliu Li ◽  
Jianguang Guo ◽  
Jiajun Huang ◽  
Huitao Xu ◽  
Zhijun Dong ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Transverse Section ◽  
High Current Density ◽  
Lithium Ion ◽  
Carbon Layer ◽  
High Current ◽  
Capacity Retention ◽  
Graphite Fibers ◽  
Layer Orientation

In this study, three kinds of round-shaped pitch-based graphite fiber with different microstructural features (crystallinity and carbon layer orientation) were fabricated by melt-spinning, preoxidation, carbonization and graphitization. The morphology, crystalline size and carbon layer orientation of carbon fibers from different pitch precursors and spinning rates were characterized through X-ray diffraction, scanning electron microscopy and transmission electron analyses. The correlation of the electrochemical performance and microstructure of graphite fibers as anode materials for lithium-ion batteries was investigated. The results suggest that large-diameter anisotropic graphite fibers (L-AF3000) with a radial texture of the transverse section are more favorable for lithium intercalation storage. The discharge capacity of L-AF3000 is 319.1 mAh∙g−1 at 0.1 C (current density). Nevertheless, the capacity drops to 209.9 mAh∙g−1 at a high current density of 1 C, and the capacity retention is only 82.2% over 100 cycles at 0.1 C. Small-diameter anisotropic graphite fibers (S-AF3000) with a spiral-shaped wrinkle texture of the transverse section possess discharge capacities of 284.1 mAh∙g−1 at 0.1 C and 260.2 mAh∙g−1 at a high current density of 1 C. Meanwhile, the best capacity retention of the fibers is 101.6% over 100 cycles at 0.1 C. The results suggest that the disordered carbon layers in S-AF3000 can retain the structural integrity of fibers as anode material for lithium-ion batteries and thus obtain excellent cycle stability. In addition, larger crystalline sizes of fibers correspond to higher discharge capacity, and a smaller diameter is beneficial to the fast insertion and extraction of lithium-ion in fibers.

Rational design of the pea-pod structure of SiOx/C nanofibers as a high-performance anode for lithium ion batteries

2020 ◽  
Vol 7 (8) ◽  
pp. 1762-1769 ◽  
Author(s):  
Yuchao Zheng ◽  
Xiangzhong Kong ◽  
Ibrahim Usman ◽  
Xuefang Xie ◽  
Shuquan Liang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Performance ◽  
Rational Design ◽  
Lithium Ion ◽  
Electrospinning Method ◽  
Pea Pod ◽  
Polymer Nanospheres

Pea-pod structured SiOx/C nanofibers were synthesized by the electrospinning method, whose structure can be controlled by adjusting the addition amounts of organosilica-polymer nanospheres and they exhibit superior electrochemical performance.

One-step Synthesis of Amorphous Nickel Iron Phosphide Hierarchical Nanostructures for Water Electrolysis with Superb Stability at High Current Density

2021 ◽  
Author(s):  
Yuefeng Yu ◽  
Xun He ◽  
Rong Li ◽  
Xinglong Gou
Keyword(s):  
High Performance ◽  
High Current Density ◽  
Water Electrolysis ◽  
Bifunctional Catalysts ◽  
High Current ◽  
Hierarchical Nanostructures ◽  
Iron Phosphide ◽  
Nickel Iron ◽  
Metal Free ◽  
One Step

Development of noble-metal-free high-performance bifunctional catalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is essential but challenging for hydrogen production from water electrolysis. Herein, amorphous bimetallic...

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