Designing PEDOT-modified V6O13 nanosheet arrays for sodium storage

2021 ◽  
pp. 2143001
Author(s):  
Lin Wang ◽  
Yichun Wang ◽  
Guoqiang Jiang ◽  
Jiangfeng Ni ◽  
Liang Li
Keyword(s):  
Direct Contact ◽  
Material Design ◽  
Reversible Capacity ◽  
Vanadium Oxides ◽  
Side Reactions ◽  
Potential Range ◽  
Nanosheet Arrays ◽  
High Theoretical Capacity ◽  
Sodium Storage ◽  
Initial Capacity

Vanadium oxides, such as V6O[Formula: see text], have a high theoretical capacity for sodium storage, but their performance faces the challenges of low conductivity and poor cycling stability caused by side reactions. To solve these problems, we report on the material design of self-supported nanosheet arrays coated with poly(3, 4-ethylenedioxythiophene) (PEDOT). In this design, the nanosheet architecture facilitates the electron and ion transport to boost the charge storage, while the PEDOT coating prevents the direct contact between the electrode nanosheet and the electrolyte, thus inhibiting the occurrence of side reactions. This PEDOT-modified nanosheet electrode exhibits a reversible capacity of 179 mAh g[Formula: see text] in the potential range of 1.5–3.8 V, and retains 66% of the initial capacity at a rate of 1 C for 100 cycles.

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 Understanding Sulfur Redox Mechanisms in Different Electrolytes for Room-Temperature Na–S Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Hanwen Liu ◽  
Wei-Hong Lai ◽  
Qiuran Yang ◽  
Yaojie Lei ◽  
Can Wu ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Surface ◽  
Reversible Capacity ◽  
High Loading ◽  
Side Reactions ◽  
Liquid Sulfur ◽  
Shuttle Effect ◽  
Loading Ratio ◽  
Solid Liquid ◽  
Sulfur Cathodes

Abstract This work reports influence of two different electrolytes, carbonate ester and ether electrolytes, on the sulfur redox reactions in room-temperature Na–S batteries. Two sulfur cathodes with different S loading ratio and status are investigated. A sulfur-rich composite with most sulfur dispersed on the surface of a carbon host can realize a high loading ratio (72% S). In contrast, a confined sulfur sample can encapsulate S into the pores of the carbon host with a low loading ratio (44% S). In carbonate ester electrolyte, only the sulfur trapped in porous structures is active via ‘solid–solid’ behavior during cycling. The S cathode with high surface sulfur shows poor reversible capacity because of the severe side reactions between the surface polysulfides and the carbonate ester solvents. To improve the capacity of the sulfur-rich cathode, ether electrolyte with NaNO3 additive is explored to realize a ‘solid–liquid’ sulfur redox process and confine the shuttle effect of the dissolved polysulfides. As a result, the sulfur-rich cathode achieved high reversible capacity (483 mAh g−1), corresponding to a specific energy of 362 Wh kg−1 after 200 cycles, shedding light on the use of ether electrolyte for high-loading sulfur cathode.

scholarly journals Effective ion pathways and 3D conductive carbon networks in bentonite host enable stable and high-rate lithium–sulfur batteries

2021 ◽  
Vol 10 (1) ◽  
pp. 20-33
Author(s):  
Lian Wu ◽  
Yongqiang Dai ◽  
Wei Zeng ◽  
Jintao Huang ◽  
Bing Liao ◽  
...  
Keyword(s):  
Network Architecture ◽  
High Performance ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
High Rate ◽  
Lithium Sulfur Batteries ◽  
Carbon Networks ◽  
Carbon Coated ◽  
Lithium Sulfur ◽  
Initial Capacity

Abstract Fast charge transfer and lithium-ion transport in the electrodes are necessary for high performance Li–S batteries. Herein, a N-doped carbon-coated intercalated-bentonite (Bent@C) with interlamellar ion path and 3D conductive network architecture is designed to improve the performance of Li–S batteries by expediting ion/electron transport in the cathode. The interlamellar ion pathways are constructed through inorganic/organic intercalation of bentonite. The 3D conductive networks consist of N-doped carbon, both in the interlayer and on the surface of the modified bentonite. Benefiting from the unique structure of the Bent@C, the S/Bent@C cathode exhibits a high initial capacity of 1,361 mA h g−1 at 0.2C and achieves a high reversible capacity of 618.1 m Ah g−1 at 2C after 500 cycles with a sulfur loading of 2 mg cm−2. Moreover, with a higher sulfur loading of 3.0 mg cm−2, the cathode still delivers a reversible capacity of 560.2 mA h g−1 at 0.1C after 100 cycles.

Anode property of carbon coated LiFePO4 nanocrystals

2016 ◽  
Vol 09 (01) ◽  
pp. 1650004 ◽  
Author(s):  
Jiangfeng Ni ◽  
Jiaxing Jiang ◽  
S. V. Savilov ◽  
S. M. Aldoshin
Keyword(s):  
Cathode Material ◽  
Lithium Batteries ◽  
Reversible Capacity ◽  
Rechargeable Battery ◽  
Potential Range ◽  
Rechargeable Lithium Batteries ◽  
Capacity Fading ◽  
High Reversible Capacity ◽  
Carbon Coated ◽  
A Current

Nanostructured LiFePO4 is appealing cathode material for rechargeable lithium batteries. Herein, however, we report the intriguing anode properties of carbon coated LiFePO4 nanocrystals. In the potential range of 0–3.0 V, the LiFePO4 nanocrystal electrodes afford high reversible capacity of 373 mAh[Formula: see text]g[Formula: see text] at a current rate of 0.05 A[Formula: see text]g[Formula: see text] and retains 239 mAh[Formula: see text]g[Formula: see text] at a much higher rate of 1.25 A[Formula: see text]g[Formula: see text]. In addition, it is capable of sustaining 1000 cycles at 1.25 A[Formula: see text]g[Formula: see text] without any capacity fading. Such superior properties indicate that nanostructured LiFePO4 could also be promising anode for rechargeable battery applications.

ELECTROCHEMICAL PROPERTIES OF BiFeO3 THIN FILMS PREPARED BY PULSED LASER DEPOSITION

2009 ◽  
Vol 02 (04) ◽  
pp. 163-167 ◽  
Author(s):  
HUI XIA ◽  
FENG YAN ◽  
MAN ON LAI ◽  
LI LU ◽  
WENDONG SONG
Keyword(s):  
Pulsed Laser Deposition ◽  
Steel Substrate ◽  
High Capacity ◽  
Pulsed Laser ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Laser Deposition ◽  
Potential Range ◽  
Morphology Characterization ◽  
Charge Discharge

BiFeO3 thin film is deposited on the stainless steel substrate by pulsed laser deposition (PLD). Structural characterization using X-ray diffraction indicates that the film is polycrystalline with perovskite structure. Morphology characterization by field emission scanning electron microscopy reveals that the film is composed of grains with wide size distribution with a porous structure. Charge/discharge in the potential range between 0.05 and 3 V shows that the reversible capacity of the first charge/discharge cycle at 280 mA/g current density is about 770 mAh/g with high columbic efficiency about 74%. The reversible capacity after 50 cycles remains 50% of its initial capacity. The preliminary results indicated that BiFeO3 is a promising high capacity anode for lithium-ion batteries.

scholarly journals Facile Synthesis of FePS3 Nanosheets@MXene Composite as a High-Performance Anode Material for Sodium Storage

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Yonghao Ding ◽  
Yu Chen ◽  
Na Xu ◽  
Xintong Lian ◽  
Linlin Li ◽  
...  
Keyword(s):  
Anode Material ◽  
High Performance ◽  
Storage System ◽  
Electronic Conductivity ◽  
Reversible Capacity ◽  
Energy Storage System ◽  
Sodium Ion ◽  
Cyclic Process ◽  
Excellent Property ◽  
Sodium Storage

AbstractSearching for advanced anode materials with excellent electrochemical properties in sodium-ion battery is essential and imperative for next-generation energy storage system to solve the energy shortage problem. In this work, two-dimensional (2D) ultrathin FePS3 nanosheets, a typical ternary metal phosphosulfide, are first prepared by ultrasonic exfoliation. The novel 2D/2D heterojunction of FePS3 nanosheets@MXene composite is then successfully synthesized by in situ mixing ultrathin MXene nanosheets with FePS3 nanosheets. The resultant FePS3 nanosheets@MXene hybrids can increase the electronic conductivity and specific surface area, assuring excellent surface and interfacial charge transfer abilities. Furthermore, the unique heterojunction endows FePS3 nanosheets@MXene composite to promote the diffusion of Na+ and alleviate the drastic change in volume in the cyclic process, enhancing the sodium storage capability. Consequently, the few-layered FePS3 nanosheets uniformly coated by ultrathin MXene provide an exceptional reversible capacity of 676.1 mAh g−1 at the current of 100 mA g−1 after 90 cycles, which is equivalent to around 90.6% of the second-cycle capacity (746.4 mAh g−1). This work provides an original protocol for constructing 2D/2D material and demonstrates the FePS3@MXene composite as a potential anode material with excellent property for sodium-ion batteries.

scholarly journals Thermodynamic analysis and kinetic optimization of high-energy batteries based on multi-electron reactions

2020 ◽  
Vol 7 (8) ◽  
pp. 1367-1386 ◽  
Author(s):  
Yong-Xin Huang ◽  
Feng Wu ◽  
Ren-Jie Chen
Keyword(s):  
Electrode Materials ◽  
Energy Systems ◽  
Material Design ◽  
High Energy ◽  
Future Research ◽  
Research Directions ◽  
High Theoretical Capacity ◽  
Future Research Directions ◽  
High Output Voltage ◽  
High Output

Abstract Multi-electron reaction can be regarded as an effective way of building high-energy systems (>500 W h kg−1). However, some confusions hinder the development of multi-electron mechanisms, such as clear concept, complex reaction, material design and electrolyte optimization and full-cell fabrication. Therefore, this review discusses the basic theories and application bottlenecks of multi-electron mechanisms from the view of thermodynamic and dynamic principles. In future, high-energy batteries, metal anodes and multi-electron cathodes are promising electrode materials with high theoretical capacity and high output voltage. While the primary issue for the multi-electron transfer process is sluggish kinetics, which may be caused by multiple ionic migration, large ionic radius, high reaction energy barrier, low electron conductivity, poor structural stability, etc., it is urgent that feasible and versatile modification methods are summarized and new inspiration proposed in order to break through kinetic constraints. Finally, the remaining challenges and future research directions are revealed in detail, involving the search for high-energy systems, compatibility of full cells, cost control, etc.

scholarly journals Cu2Se Nanoparticles Encapsulated by Nitrogen-Doped Carbon Nanofibers for Efficient Sodium Storage

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 302 ◽  
Author(s):  
Le Hu ◽  
Chaoqun Shang ◽  
Eser Metin Akinoglu ◽  
Xin Wang ◽  
Guofu Zhou
Keyword(s):  
Carbon Nanofibers ◽  
Electronic Conductivity ◽  
Diffusion Path ◽  
Rate Performance ◽  
Fiber Network ◽  
Nitrogen Doped ◽  
High Theoretical Capacity ◽  
Nitrogen Doped Carbon ◽  
Sodium Storage ◽  
Large Volume Change

Cu2Se with high theoretical capacity and good electronic conductivity have attracted particular attention as anode materials for sodium ion batteries (SIBs). However, during electrochemical reactions, the large volume change of Cu2Se results in poor rate performance and cycling stability. To solve this issue, nanosized-Cu2Se is encapsulated in 1D nitrogen-doped carbon nanofibers (Cu2Se-NC) so that the unique structure of 1D carbon fiber network ensures a high contact area between the electrolyte and Cu2Se with a short Na+ diffusion path and provides a protective matrix to accommodate the volume variation. The kinetic analysis and DNa+ calculation indicates that the dominant contribution to the capacity is surface pseudocapacitance with fast Na+ migration, which guarantees the favorable rate performance of Cu2Se-NC for SIBs.

Marcasite iron sulfide as a high-capacity electrode material for sodium storage

2018 ◽  
Vol 6 (35) ◽  
pp. 17111-17119 ◽  
Author(s):  
Natalia Voronina ◽  
Hitoshi Yashiro ◽  
Seung-Taek Myung
Keyword(s):  
Cost Effectiveness ◽  
Electrode Materials ◽  
Iron Sulfide ◽  
High Capacity ◽  
Sodium Ion ◽  
Sodium Ion Batteries ◽  
Iron Sulfides ◽  
High Theoretical Capacity ◽  
Sodium Storage ◽  
Significant Attention

Iron sulfides have attracted significant attention as promising electrode materials for sodium-ion batteries (SIBs) owing to their low electronegativity, high theoretical capacity, and cost-effectiveness.

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