scholarly journals 2D Coordination Network of Trioxotriangulene with Multiple Redox Abilities and Its Rechargeable Battery Performance

2020 ◽  
Vol 21 (13) ◽  
pp. 4723
Author(s):  
Tsuyoshi Murata ◽  
Taro Koide ◽  
Hirofumi Nobukuni ◽  
Ryotaro Tsuji ◽  
Yasushi Morita
Keyword(s):  
Active Material ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Zinc Ion ◽  
Cycle Performance ◽  
Rechargeable Battery ◽  
Neutral Radical ◽  
Coordination Network ◽  
Multi Stage ◽  
Redox Ability

A three-fold symmetric trioxotriangulene derivative with three pyridyl groups as coordinating sites was designed and synthesized. In a cyclic voltammetry measurement, the trioxotriangulene skeleton exhibited a multi-stage redox ability from neutral radical to radical tetra-anion species. In the zinc complex of monoanion species, three pyridyl groups coordinated to the zinc ion to build up a two-dimensional coordination network with a cavity larger than 12 Å in diameter. This complex was utilized as a cathode active material of a lithium ion battery, and it exhibited a capacity of ca. 60 mAh g−1 per the weight of the active material with a stable cycling performance up to 1000 cycles. This work shows that the coordination network formed by the trioxotriangulene-based ligand was effective in the improvement of cycle performance of the organic rechargeable battery.

scholarly journals Integrated Anode Electrode Composited Cu–Sn Alloy and Separator for Microscale Lithium Ion Batteries

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 603 ◽  
Author(s):  
Yuxia Liu ◽  
Kai Jiang ◽  
Shuting Yang
Keyword(s):  
Current Density ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Electrode Structure ◽  
Microelectronic Devices ◽  
Anode Electrode ◽  
Integrated Anode ◽  
A Current

A novel integrated electrode structure was designed and synthesized by direct electrodepositing of Cu–Sn alloy anode materials on the Celgard 2400 separator (Cel-CS electrode). The integrated structure of the Cel-CS electrode not only greatly simplifies the battery fabrication process and increases the energy density of the whole electrode, but also buffers the mechanical stress caused by volume expansion of Cu–Sn alloy active material; thus, effectively preventing active material falling off from the substrate and improving the cycle stability of the electrode. The Cel-CS electrode exhibits excellent cycle performance and superior rate performance. A capacity of 728 mA·h·g−1 can be achieved after 250 cycles at the current density of 100 mA·g−1. Even cycled at a current density of 5 A·g−1 for 650 cycles, the Cel-CS electrode maintained a specific capacity of 938 mA·h·g−1, which illustrates the potential application prospects of the Cel-CS electrode in microelectronic devices and systems.

Electrochemical Performance Cr Doped Spinel LiMn2O4 Cathode for Lithium Ion Batteries

2014 ◽  
Vol 636 ◽  
pp. 49-53
Author(s):  
Si Qi Wen ◽  
Liang Chao Gao ◽  
Jia Li Wang ◽  
Lei Zhang ◽  
Zhi Cheng Yang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Cycle Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Discharge Test

To improve the cycle performance of spinel LiMn2O4as the cathode of 4 V class lithium ion batteries, spinel were successfully prepared using the sol-gel method. The dependence of the physicochemical properties of the spinel LiCrxMn2-xO4(x=0,0.05,0.1,0.2,0.3,0.4) powders powder has been extensively investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), charge-discharge test and electrochemical impedance spectroscopy (EIS). The results show that as Mn is replaced by Cr, the initial capacity decreases, but the cycling performance improves due to stabilization of spinel structure. Of all, the LiCr0.2Mn1.8O4has best electrochemical performance, 107.6 mAhg-1discharge capacity, 96.1% of the retention after 50 cycles.

scholarly journals Electrospun Fe3O4-Sn@Carbon Nanofibers Composite as Efficient Anode Material for Li-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2203
Author(s):  
Hong Wang ◽  
Yuejin Ma ◽  
Wenming Zhang
Keyword(s):  
Anode Materials ◽  
Electrochemical Reaction ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Solvothermal Reaction ◽  
Li Ion Batteries ◽  
Li Ion ◽  
A Current

Nanoscale Fe3O4-Sn@CNFs was prepared by loading Fe3O4 and Sn nanoparticles onto CNFs synthesized via electrostatic spinning and subsequent thermal treatment by solvothermal reaction, and were used as anode materials for lithium-ion batteries. The prepared anode delivers an excellent reversible specific capacity of 1120 mAh·g−1 at a current density of 100 mA·g−1 at the 50th cycle. The recovery rate of the specific capacity (99%) proves the better cycle stability. Fe3O4 nanoparticles are uniformly dispersed on the surface of nanofibers with high density, effectively increasing the electrochemical reaction sites, and improving the electrochemical performance of the active material. The rate and cycling performance of the fabricated electrodes were significantly improved because of Sn and Fe3O4 loading on CNFs with high electrical conductivity and elasticity.

scholarly journals Effects of In Situ Graphitic Nanocarbon Coatings on Cycling Performance of Silicon-Flake-Based Anode of Lithium Ion Battery

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 138
Author(s):  
Yonhua Tzeng ◽  
Wei-Chih Huang ◽  
Cheng-Ying Jhan ◽  
Yi-Hsuan Wu
Keyword(s):  
Lithium Ion Battery ◽  
Electrochemical Impedance ◽  
Iron Catalyst ◽  
Active Material ◽  
Lithium Ion ◽  
Chemical Vapor ◽  
Cycling Performance ◽  
Carbon Films ◽  
Conductivity Enhancement ◽  
Wafer Manufacturing

We coated graphitic nanocarbons by thermal chemical vapor deposition (CVD) on silicon flakes recycled from the waste of silicon wafer manufacturing processes as an active material for the anode of lithium ion battery (LIB). Ferrocene contains both iron catalyst and carbon, while camphor serves as an additional carbon source. Water vapor promotes catalytic growth of nanocarbons, including carbon nanotubes (CNTs), carbon fibers (CFs), and carbon films made of graphitic carbon nanoparticles, at temperatures ranging from 650 to 850 °C. The container of silicon flakes rotates for uniform coatings on silicon flakes of about 100 nm thick and 800–1000 nm in lateral dimensions. Due to short CVD time, besides CNTs and CFs, surfaces of silicon flakes deposit with high-density graphitic nanoparticles, especially at a low temperature of 650 °C. Nanocarbon coatings were characterized by SEM, EDX, ESCA, and Raman spectroscopy. Half-cells were characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and retention of capacity in discharge/charge cycling. Silicon-flake-based anode with nanocarbon coatings at both 650 and 850 °C exhibited capacity retention of 2000 mAh/g after 100 cycles at 0.1 C, without needing any conductivity enhancement material such as Super P.

Facile and Scalable Synthesis of Copolymer-Sulfur Composites as Cathodes for High Performance Lithium-Sulfur Batteries

MRS Advances ◽  
2017 ◽  
Vol 2 (54) ◽  
pp. 3271-3276 ◽  
Author(s):  
Jingjing Liu ◽  
Brennan Campbell ◽  
Rachel Ye ◽  
Jeffrey Bell ◽  
Zafer Mutlu ◽  
...  
Keyword(s):  
Sulfur Content ◽  
High Performance ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Cycling Performance ◽  
Commercial Application ◽  
Lithium Sulfur Batteries ◽  
Scalable Synthesis

ABSTRACTTo promote the energy density of lithium-ion battery, the sulfur-based cathode has attracted extensive attention because of its high specific capacity of 1672 mAh g-1 and its high abundance. However, the sulfur shuttling effects and the loss of active material during lithiation hinder its commercial application. To tackle these issues, we synthesized a stable copolymer-sulfur composite by chemically binding sulfur. The composite with 86% sulfur content was prepared using 1,3-diethynylbenzen and sulfur particles via scalable invers vulcanization. The sulfur content in copolymer sulfur was achieved as high as 86%. Our copolymer-sulfur composite cathode showed excellent cycling performance with a specific capacity of 454 mAh g-1 at 0.1 C after 300 cycles. We demonstrate that the organosulfur-DEB units in the copolymer-sulfur composite serve as the ‘plasticizer’ to effectively prevent the polysulfide shuttling.

scholarly journals NbO2 as a Noble Zero-Strain Material for Li-Ion Batteries: Electrochemical Redox Behavior in a Nonaqueous Solution

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2960 ◽  
Author(s):  
Yang-Soo Kim ◽  
Yonghoon Cho ◽  
Paul M. Nogales ◽  
Soon-Ki Jeong
Keyword(s):  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Active Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Nonaqueous Solution ◽  
Constant Current ◽  
Lithium Ions ◽  
Rutile Structure

Lithium-ion batteries are widely available commercially and attempts to extend the lifetime of these batteries remain necessary. The energy storage characteristics of NbO2 with a rutile structure as a material for the negative electrode of lithium-ion batteries were investigated. When negative potential was applied to the NbO2 electrode during application of a constant current in a nonaqueous solution containing lithium ions, these ions were inserted into the NbO2. Conversely, upon application of positive potential, the inserted lithium ions were extracted from the NbO2. In situ X-ray diffraction results revealed that the variation in the volume of NbO2 accompanying the insertion and extraction of lithium was 0.14%, suggesting that NbO2 is a zero-strain (usually defined by a volume change ratio of 1% or less) active material for lithium-ion batteries. Moreover, the highly stable structure of NbO2 allows the corresponding electrode to exhibit excellent cycling performance and coulombic efficiency.

scholarly journals Facile Synthesis of Fe2O3 Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Chunyan Zhang ◽  
Nianqiao Qin ◽  
Jing Li ◽  
Yan Tian ◽  
Hui Zhang
Keyword(s):  
Lithium Ion Batteries ◽  
Metal Organic Framework ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Cycle Performance ◽  
High Specific Capacity ◽  
Calcination Process ◽  
Metal Organic ◽  
Initial Cycle

Sponge-like porous Fe2O3 nanomaterials were obtained through the calcination process of the iron-based metal organic framework (MIL-101). As anode materials for lithium-ion batteries, thus, obtained products show a good electrochemical performance with a high specific capacity (1358 mA h g-1 at 100 mA g-1 in the initial cycle) and a relatively stable cycle performance (750 mA h g-1 after 80 charge/discharge cycles). The superior cycling performance may be attributed to their special structure, which facilitates charge transfer and Li+ diffusion.

Synthesis and high cycle performance of Li2ZnTi3O8/C anode material promoted by asphalt as a carbon precursor

RSC Advances ◽  
2016 ◽  
Vol 6 (55) ◽  
pp. 49298-49306 ◽  
Author(s):  
Yurong Ren ◽  
Peng Lu ◽  
Xiaobing Huang ◽  
Jianning Ding ◽  
Haiyan Wang
Keyword(s):  
Anode Material ◽  
Electronic Conductivity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Carbon Layer ◽  
Cycle Performance ◽  
Carbon Precursor ◽  
Ion Diffusion ◽  
Lithium Ion Diffusion

A carbon layer (ca. 3 nm) formed on the surface of Li2ZnTi3O8 nanoparticles (ca. 30 nm) which is favorable to improve the electronic conductivity and lithium ion diffusion, resulting in improved rate capability and cycling performance.

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