JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Yuanhe Wu,Mingxia Gao,Xiang Li,Yongfeng Liu,Hongge Pan
Mesohollow and microporous carbon nanofibers (MhMpCFs) were prepared by a coaxial electrospinning with polyacrylonitrile (PAN) and polymethylmethacrylate (PMMA) as outer and inner spinning solutions followed by a carbonization. The carbon fibers were thermal treated with sublimed sulfur to form S/MhMpCFs composite, which was used as cathode material for lithium–sulfur batteries. Electrochemical study shows that the S/MhMpCFs cathode material provides a maximum capacity of 815 mA h/g after several cycles of activation, and the capacity retains 715 mA h/g after 70 cycles, corresponding to a retention of 88%. The electrochemical property of the S/MhMpCFs composite is much superior than the S-incorporated solid carbon fibers prepared from electrospinning of single PAN. The mechanism of the enhanced electrochemical property of the S/MhMpCFs composite is discussed.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Shengheng Nong,Dongyuan Huang,Yaoying Li,Ruoxi Yang,Jiawei Xie,Jia Li,Haifu Huang,Xianqing Liang,Guangxu Li,Zhiqiang Lan,Haizhen Liu,Dan Huang,Shuaikai Xu,Jin Guo,Wenzheng Zhou
Lithium–sulfur batteries have been researched extensively because of their high energy density and low price. However, the poor conductivity of sulfur, the shuttle effect of polysulfide, the slow redox kinetics of sulfur species, and the significant volume expansion and contraction during charging and discharging have hindered the commercial application of lithium–sulfur batteries. In this study, a simple, scalable, and cost-effective strategy was developed to control the balance of the porosity, specific surface area, graphitization , heteroatom co-doping, and polar-polar interactions of a biomass carbon source. With this strategy, multifunctional porous carbon materials with three-dimensional network structures were prepared to serve as sulfur-loading hosts with high specific surface area, strong adsorption activity, and good conductivity. Moreover, the optimal porous carbon material was directly coated on a commercial separator, and the modified separator was found to further improve the electrochemical performance of a lithium–sulfur battery . As a result, for the battery with GPCS-3 as cathode electrode and modified separator as separator, the initial discharge capacity at 1.0C is 926.2 mAh g −1 . After 300 cycles, the discharge capacity is 712.7 mAh g −1 , and the average capacity decay is only 0.077 % per cycle. Since the three-dimensional network structure material exhibits good performance as a sulfur-loading host as well as the ability to effectively modify a separator, this study provides a valuable strategy for the fabrication of high energy density lithium–sulfur batteries.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2017
·
IF 4.519
Junhui Li,Shan Li,Lufeng Yan,Tian Ding,Robert J. Linhardt,Yanlei Yu,Xinyue Liu,Donghong Liu,Xingqian Ye,Shiguo Chen
Fucosylated chondroitin sulfates (fCSs) are structurally unusual glycosaminoglycans isolated from sea cucumbers that exhibit potent anticoagulant activity . These fCSs were isolated from sea cucumber, Isostichopus badionotus and Pearsonothuria graeffei . Fenton reaction followed by gel filtration chromatography afforded fCS oligosaccharides , with different sulfation patterns identified by mass and NMR spectroscopy , and these were used to clarify the relationship between the structures and the anticoagulant activities of fCSs. In vitro activities were measured by activated partial thromboplastin time (APTT), thrombin time (TT), thrombin and factor Xa inhibition, and activation of FXII . The results showed that free radicals preferentially acted on GlcA residues affording oligosaccharides that were purified from both fCSs. The inhibition of thrombin and factor X activities, mediated through antithrombin III and heparin cofactor II of fCSs oligosaccharides were affected by their molecular weight and fucose branches. Oligosaccharides with different sulfation patterns of the fucose branching had a similar ability to inhibit the FXa by the intrinsic factor Xase (factor IXa-VIIIa complex). Oligosaccharides with 2,4- O -sulfo fucose branches from fCS- Ib showed higher activities than ones with 3,4- O -disulfo branches obtained from fCS- Pg . Furthermore, a heptasaccharide is the minimum size oligosaccharide required for anticoagulation and FXII activation. This activity was absent for fCS oligosaccharides smaller than nonasaccharides . Molecular size and fucose branch sulfation are important for anticoagulant activity and reduction of size can reverse the activation of FXII caused by native fCSs.
研究领域:
生物化学
·
药理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Ling Tang,Qin Yang,Jianfang Zhang,Guisheng Deng
A regioselective reverse strategy for the construction of eight-membered sulfur-containing heterocycle-fused γ-pyrones and 2-(1,4-dithianyl)-4-pyrones starting from 2-diazo-γ-pyrones and dithioacetals was achieved for the first time. The process combines C–S bond formation via sulfur ylides and C–C bond formation via electron transfer to afford the target molecules in a facile manner with 100% regioselectivity and in excellent isolated yields (up to 90%).
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2019
·Vol. 52
·期 29
·295502
·
IF 2.829
Binbin Qian,Chaodeng Liu,Junmin Xu,Qingqing Sun,Huige Yang,Wentao Liu,Li Zhang,Takeo Minari,Xuying Liu,Jinzhou Chen
Three-dimensional (3D) nitrogen-doped graphene frameworks contributing to high-efficiency and high-stability Li-S batteries have received wide interest in energy storage fields. Herein, a 3D nitrogen-doped graphene composite framework was prepared with spatial dendritic triamines as crosslinking interconnectors, and subsequently employed for Li-S batteries with high efficiency and stability. The nanoscale spatial network of triamine-bonded graphene as molecular spacers can enlarge the interlayer spacing and change surface topography, which allows the nanocomposites to inhibit phase separation and thus capture and homogeneously store well-dispersed sulfur nanocrystals at a high capacity exceeding 70%, even by a solution process. In our work, the composite of S@GO-TAPA as the cathode material delivers the highest initial discharge capacity of 965 mAh g−1. Besides that, an average coulombic efficiency of 91% is achieved after more than 100 cycles and 66.5% of the capacity remains, even after 100 cycles at 0.2 °C. The results suggest that the shuttle effect is remarkably suppressed. Therefore, the design strategy for cathode media is promising for fully solution-processing energy storage devices with printing, coating and spraying techniques.
研究领域:
能源存储
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shunli Wang,Ying Liang,Tingting Dai,Yalin Liu,Zhuyin Sui,Xinlong Tian,Qi Chen
Covalent organic frameworks (COFs) with pre-designed structure and customized properties have been employed as sulfur storage materials for lithium-sulfur (Li-S) batteries. In this work, a cationic mesoporous COF ( COF-NI ) was synthesized by grafting a quaternary ammonium salt group onto the pore channel of COFs via a one-pot three components tandem reaction strategy. The post-functionalized COFs were utilized as the matrix framework to successfully construct the Li-S battery with high-speed capacity and long-term stability. The experimental results showed that, after loading active material sulfur, cationic COF-NI effectively suppressed the shuttle effect of the intermediate lithium polysulfide species in Li-S batteries, and exhibited better cycle stability than the as-obtained neutral COF ( COF-Bu ). For example, compared with COF-Bu based sulfur cathode (521 mA h g −1 ), the cationic COF-NI based sulfur cathode maintained a discharge capacity of 758 mA h g −1 after 100 cycles. These results clearly showed that appropriate pore environment of COFs can be prepared by rational design, which can reduce the shuttle effect of lithium polysulfide species and improve the performance of Li-S battery.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 13
·7897-7906
·
IF 10.733
Jingyi Wu,Xiongwei Li,Hongxia Zeng,Yang Xue,Fangyan Chen,Zhigang Xue,Yunsheng Ye,Xiaolin Xie
The polysulfide shuttle effect and sluggish reaction kinetics can severely reduce the sulfur utilization and cycle stability of Li–S batteries, undermining their use in practical applications. Herein, we design a core–shell nanocomposite by encapsulating radially oriented MoS2 nanosheets by porous nitrogen-doped carbon (MoS2@NC) via an eco-friendly method. The highly oriented MoS2 nanosheets in MoS2@NC avoid aggregation of the active sites for polysulfide adsorption, and the desirable integration of the catalytic MoS2 nanosheet core and a highly conductive carbon shell provides a constant flow of electrons to the captured polysulfides for improved polysulfide conversion kinetics. The combined benefits of high polysulfide inhibition and smooth electron and Li+ transfer by a thin layer of MoS2@NC (3.3 μm thick) enable a simple sulfur–carbon black cathode with high reversible capacities, good rate performances (876 mA h g−1 at 3C), an excellent cycle stability over 1500 cycles with a negligible 0.034% decay per cycle, and satisfactory areal capacities with increased sulfur loading (2.0–3.7 mA h cm−2 at various rates). This work provides a proof-of-concept study on the rational design of interlayer materials in energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xueya Zhang,Jie Li,Chunhui Gao,Chenyang Shi,Liang He,Qian Xiang,Bo Hong,Yanqing Lai,Zhian Zhang,Kai Zhang
Lithium–Sulfur (Li–S) battery is a promising device in the field of electrochemical energy storage since its high specific capacity and low cost. However, the low insoluble Li 2 S conversion efficiency and uncontrollable deposition on the electrodes lead to low sulfur utilization, poor reversibility and rapid capacity decay. Consequently, the practical application of Li–S battery is limited. Herein, phenyl diselenide (PDSe) is added into the conventional electrolyte try to improve the batteries performance. The results show that the Se–Se bond in PDSe is broken and the Li–S bond in Li 2 S is elongated induced by PDSe. Moreover, PDSe promotes Li 2 S conversion and reduces Li 2 S deposition on the electrodes. As a result, the batteries using the electrolyte with PDSe exhibit enhanced discharge capacity and improved rate performance. Particularly, the batteries with 5.0 wt% PDSe additive exhibit a high initial discharge capacity of 1585.6 mAh g −1 , even after 300 cycles at 0.5 C, the batteries still maintain 916.5 mAh g −1 , which is much higher than conventional batteries of 618.7 mA h g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 22
·225402
·
IF 3.953
Zongjie Hu,Gaojie Yan,Jinchen Zhao,Xiaojie Zhang,Yi Feng,Xiongwei Qu,Haijie Ben,Jingjing Shi
The practical application of lithium–sulfur battery is seriously limited by the loss of active substances and the deterioration of cycle stability caused by the 'shuttle effect' of lithium polysulfides (LiPSs). In this work, graphene oxide (GO) coated covalent organic framework (COF) compound materials were synthesized as sulfur host material in spray-drying process. The polar groups on COF can efficiently adsorb LiPSs through lithiophilic interaction, which can reduce the 'shuttle effect' caused by soluble LiPSs. Besides, GO in the outer layer can wrap discrete sulfur to reduce the loss of active substances, which further improves the cycle stability of the cathode. The COF@GO/S cathode exhibits a high initial specific capacity of 848.4 mAh g−1 and retains a capacity of 601.1 mAh g−1 after 500 cycles at 1 C counting with a low capacity fading of 0.058% per cycle.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 31
·e202200363
·
IF 5.02
Ting-Ting Zhang,Cheng-Ye Yang,Jin Qu,Wei Chang,Yu-Hao Liu,Xian-Zhi Zhai,Hong-Jun Liu,Zhi-Guo Jiang,Zhong-Zhen Yu
Graphical A polymer encapsulation strategy is designed to synthesize atomic Fe and N co-doped hollow carbon nanospheres (Fe−NHC) with Fe−N x sites for modifying commercial PP separator of LSBs to suppress the shuttle effect and promote the sluggish kinetics of intermediate polysulfides. Therefore, the battery with the Fe−NHC/PP separator delivers outstanding cycling and rate performances. Even at a harsh current density of 4 C, a high capacity of 824 mA h g −1 is achieved, indicating the superiority of the Fe-NHC/PP separator in LSBs. As competitive next-generation rechargeable batteries, lithium-sulfur batteries (LSBs) suffer from the shuttle effect and the sluggish kinetics of intermediate polysulfides during charge and discharge processes, adversely affecting their electrochemical performances and actual applications. Herein, we demonstrate a polymer encapsulation strategy to synthesize atomic Fe and N co-doped hollow carbon nanospheres (Fe−NHC) with Fe−N x sites for modifying commercial PP separator of LSBs to suppress the shuttle effect and promote the kinetics of intermediate polysulfides. Benefiting from the excellent structural design, the doped-N with positive charges could effectively adsorb negatively charged soluble polysulfides, help attract the soluble polysulfides to the Fe atoms and boost the catalytic transformation of the soluble polysulfides. Additionally, such a thin carbon shell could provide a short mass diffusion pathway and hence promote the adsorption and the catalytic conversion. Therefore, the battery with the Fe−NHC/PP separator delivers outstanding cycling and rate performances. At the large current density of 1 C, the specific capacity is 1079 mA h g −1 and maintains a low loss of 0.076 % per cycle within 500 cycles. Even at a harsh current density of 4 C, a high capacity of 824 mA h g −1 is still achieved, indicating the advantage of the Fe−NHC/PP separator in LSBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hua Yang,Mingshan Wang,Tao Wang,Hao Xu,Zhenliang Yang,Lei Zhang,Junchen Chen,Yun Huang,Xing Li
Lithium-sulfur (Li-S) batteries have been regarded as a competitive candidate for next generation electrochemical energy-storage technologies. However, the insulation of charge and discharge products (sulfur and lithium sulfide) and the shuttle efforts of lithium polysulfides (LiPSs), result in not only a series of phase conversion but also sluggish redox kinetics in Li-S electrochemistry. Herein, we firstly designed a flexible carbon cloth/molybdenum selenide (CC/MoSe 2 ) by growing ultra-thin MoSe 2 nanosheets on CC as binder-free electrode to understand the regulation mechanism in Li-S battery. With systematic electrochemical investigation of in-situ deposition Li 2 S 8 in CC/MoSe 2 , it is found that CC/MoSe 2 exhibits high LiPSs chemical adsorption and electrocatalytic activity, which large enhances the LiPSs conversion. The dynamic regulation of LiPSs change the nucleation and growth of Li 2 S, resulting in high uniform distribution on CC/MoSe 2 electrode. Thus, it obtains high sulfur redox kinetics and utilization, which achieves initial capacity of 1142 mAh g -1 with low capacity fade of only 0.038 % per cycle over 500 cycles at 1 C. Even at high S loading (4 mg cm -2 ) and extremely low electrolyte/S (E/S) ratio of 6.2 μL mg -1 , it still delivers 1204 mAh g −1 after 100 cycles at 0.2C with 93.3% capacity maintain.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Hao Wu,Yongqiang Yang,Wei Jia,Ru Xiao,Hongzhi Wang
Lithium-sulfur (Li-S) batteries with their low price, high energy density , and environmental friendliness are considered as an ideal candidate for next generation energy storage devices. However, their development is heavily impeded by the polysulfide shuttle and inevitable growth process of lithium dendrites . In order to solve these problems simultaneously, herein, a defect-engineered separator was designed based on the commercial polypropylene (PP) substrate by constructing defective and defect-free Cu 3 (BTC) 2 (HKUST) metal organic frameworks (MOFs) on each side. On the cathode side, the existence of defects on the HKUST MOFs enhanced the Cu atoms catalytic activity and could act as "blockers" to inhibit polysulfide shuttling through Lewis acid-base interactions. Meantime, at the anode side, defect-free MOFs could be used as lithium-ion guides that can balance the internal electric field, resulting in stable lithium-ion stripping/plating and uniform lithium metal deposition . As the consequences, the assembled Li–S battery with a bilayer HKUST MOFs separator showed the long-term cycling with a super low-capacities decay of 0.06% per cycle under 1000 cycles. A prospective strategy for interfacial engineering of bilayer separator is expected from this work to facilitate the development of high performance and stability Li–S battery.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）