Chemical Science
·
2022
·Vol. 13
·期 21
·6224-6232
·
IF 9.969
Rui Xu,Hongan Tang,Yuanyuan Zhou,Fangzheng Wang,Hongrui Wang,Minhua Shao,Cunpu Li,Zidong Wei
The practical application of lithium–sulfur (Li–S) batteries is seriously hindered by severe lithium polysulfide (LiPS) shuttling and sluggish electrochemical conversions. Herein, the Co9S8/MoS2 heterojunction as a model cathode host material is employed to discuss the performance improvement strategy and elucidate the catalytic mechanism. The introduction of sulfur vacancies can harmonize the chemisorption of the heterojunction component. Also, sulfur vacancies induce the generation of radicals, which participate in a liquidus disproportionated reaction to reduce the accumulation of liquid LiPSs. To assess the conversion efficiency from liquid LiPSs to solid Li2S, a new descriptor calculated from basic cyclic voltammetry curves, nucleation transformation ratio, is proposed.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 3
·677-690
·
IF 4.4
Chen Jun-nan,Xie Feng,Wang Wei,Fu Yan,Wang Jian,Xu Bin
Due to the high toxicity of cyanide, researchers are trying to find an environmentally friendly and sustainable leaching process for precious metals. Thiosulfate is considered one of the most promising alternative leaching systems. Nevertheless, a traditional thiosulfate leaching solution generally consists of copper sulfate and ammonia, in which copper sulfate acts as oxidant and ammonia acts as copper ion stabilizer. However, ammonia is another toxic reagent. For this reason, a novel and eco-friendly system of copper sulfate-tartrate-thiosulfate was investigated for silver sulfide leaching in this work. The effects of rotation speed, temperature, initial pH, copper sulfate, tartrate and thiosulfate concentrations and different atmospheres on the dissolution rate of Ag 2 S were examined. The process of silver sulfide dissolution is controlled by chemical reactions with an apparent activation energy of 43.49 kJ/mol. The reaction orders of silver sulfide leaching with respect to copper sulfate, tartrate, and thiosulfate concentrations in copper sulfate-tartrate-thiosulfate solutions are 0.491, 1.366, and 0.916, respectively. A detailed dissolution route of Ag 2 S was proposed based on XRD analysis of intermediate products such as Ag 3 CuS 2 , AgCuS and (Ag, Cu) 2 S. XPS analysis indicated that elemental sulfur was determined to be the final oxidant product of sulfur ions from Ag 2 S.
研究领域:
冶金工程
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环境化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Tianyu Shi,Chenyuan Zhao,Yuxiang Zhou,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Lithium-sulfur batteries (LSBs) are regarded as promising candidates for next-generation electrochemical energy storage systems due to their low cost and high energy density . However, the insulative sulfur, the volume expansion and high soluble polysulfides are three roots impeding their practical applications, and consequently bring challenges of low sulfur utilization, poor cyclic stability and sluggish redox kinetics. Herein, a special core–shell ZnS-CNTs/S@Ni(OH) 2 (labeled as ZnS-CNTs/S@NH) cathode has been designed to overcome above obstacles and elevate the electrochemical performance . The ZnS-CNTs/S@NH cathode is synthesized via a facile step-by-step strategy, in which ZnS-decorated CNTs was used as a framework to load sulfur and followed with a ultrathin Ni(OH) 2 (NH) layer encapsulation. The ZnS-CNT core combines merits of CNT network and polar ZnS quantum dots (QDs), accommodating the volume change, offering efficient pathways for fast electron/ion transport, and anchoring polysulfides through polar interactions. The outer Ni(OH) 2 shell physically confines the active material and meanwhile provides plenty of catalytic sites for effective polysulfide chemisorption . Benefiting from these merits, the ZnS-CNTs/S@NH cathode exhibits excellent cell performances in comparison with ZnS-CNTs/S and CNTs/S. Its discharge capacity at different C-rates is optimal in the three cathodes, which decreases from 1037.0 mAh g −1 at 0.1 C to 646.1 mAh g −1 at 2.0 C. Its cyclic capacity also manifests the slowest reduction from 861.1 to 760.1 mAh g −1 after 150 cycles at 0.5 C, showing a high retention (88.3%) and a tiny average fading rate (0.078%). The strategy in this work provides a feasible approach to design and construct core–shell cathode materials for realizing practically usable Li–S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Hang Zhao,Bingbing Tian,Chenliang Su,Ying Li
Lithium–sulfur (Li–S) batteries are regarded as promising secondary energy storage devices for their high energy density and low cost. The electrochemical performance of Li–S batteries is mainly determined by the efficient and reversible conversion of lithium-polysulfides to Li2S when discharging and to S when charging. Herein, a catalytic strategy is proposed to accelerate the reversible conversion of S and the discharge products in Li–S batteries. This reversible transformation is achieved with active sites of single-atom iron on nitrogen- and sulfur-doped porous carbon (FeNSC). We prove that the synergy between atomically dispersed iron and doped sulfur accelerates the reversible electrochemical conversion reactions in Li–S batteries. The FeNSC/S hybrid cathode exhibits superior long-term cycling stability even at a high current density of 1C, with only 0.047% capacity decay per cycle over 1000 cycles. This study demonstrates a novel method for improving the conversion of polysulfides based on electrocatalysis strategies to ultimately obtain high-performance Li–S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 62
·57346-57356
·
IF 3.289
Xue-ling Wu,Jun Zong,Han Xu,Wei Wang,Xing-jiang Liu
In this work, the solid electrolyte of Li1.5Al0.5Ge1.5(PO4)3 (LAGP) is used to suppress polysulfides shuttling in Li–S cells. Firstly, the H-type visible cell is assembled by using a LAGP glass ceramic plate and normal poly-propylene (PP) separator. It is demonstrated that the LAGP glass ceramic plate is quite effective in shutting-down the migration of polysulfide ions and improving the utilization ratio of the sulfur cathode. However, in the commercial production of Li–S batteries it is not possible to use the LAGP glass ceramic plate as a membrane due to its brittle characteristics. Herein, the LAGP modified separator has been prepared by a simple casting procedure and applied in Li–S cells. The Li-ion conductivity of the LAGP modified separator is 6.280 × 10−4 S cm−1 at room temperature. The Li-ion transference number and the Gurley value of the modified separator show that the diffusion of the polysulfide anions can be suppressed effectively. The discharge capacity of the Li–S cell with the modified separator at the 50th cycle can reach 770.1 mA h g−1, while that of the Li–S cell with the routine PP separator is only 658.4 mA h g−1 at the 50th cycle. The superior utilization of sulfur in the Li–S cells indicates that using the LAGP modified separator is a viable way to overcome the shuttling problem for practical Li–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Junhong Lu,Yinjuan Chen,Yanlin Zhang,Jie Huang,Haoyang Jiang,Dafang He,Haiqun Chen
Due to the presence of polysulfide shuttling, serious electrode expansion, and the low electrical conductivity of sulfur materials at room temperature, the commercialization of Li-S batteries is still not feasible. In this study, we have synthesized unique hollow molybdenum disulfide nanocages/reduced graphene oxide (H-MoS 2 /rGO) composites to be employed as highly effective cathodes for Li-S batteries. In this well-designed structure, the hollow MoS 2 nanocages are tightly bound by C-O-Mo bonds and uniformly distributed across the graphene sheets. The dual-function MoS 2 nanocages can adsorb polysulfides by Mo-S bond and accelerate the conversion reaction of S 8 and Li 2 S. Moreover, the 3D rGO network with abundant pores effectively reduces the diffusion path and enhances the rapid transport of electrons and ions. The hybrid H-MoS 2 /rGO cathodes with these advantages exhibit a remarkable initial discharge capacity of 801.7 mAh g -1 at 1 C, as well as a high specific discharge capacity of 533.2 mAh g -1 is remained over 500 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Xiong Song,Tuo Gao,Suqing Wang,Yue Bao,Guoping Chen,Liang-Xin Ding,Haihui Wang
Lithium-sulfur (Li-S) batteries are regarded as a promising next-generation electrical-energy-storage technology due to their low cost and high theoretical energy density . Furthermore, flexible and wearable electronics urgently requires their power sources to be mechanically robust and flexible. However, the effective progress of high-performance, flexible Li-S batteries is still hindered by the poor conductivity of sulfur cathodes and the dissolution of lithium polysulfides as well as the weak mechanical properties of sulfur cathodes. Herein, a new type of flexible porous carbon nanofiber film modified with graphene and ultrafine polar TiO 2 nanoparticles is designed as a sulfur host, in which the artful structure enabled the highly efficient dispersion of sulfur for a high capacity and a strong confinement capability of lithium polysulfides, resulting in prolonged cycle life. Thus, the cathode shows an extremely high initial specific discharge capacity of 1501 mA h g −1 at 0.1 C and an excellent rate capability of 668 mA h g −1 at 5 C as well as prolonged cycling stability. The artful design provides a facile method to fabricate high-performance, flexible sulfur cathodes for Li-S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 19
·9412-9417
·
IF 8.867
Zhaoling Ma,Li Tao,Dongdong Liu,Zhen Li,Yiqiong Zhang,Zhijuan Liu,Hanwen Liu,Ru Chen,Jia Huo,Shuangyin Wang
The development of lithium–sulfur is impeded by two main obstacles: the dissolution of lithium polysulfides and the pristine insulation of sulfur. Here, high energy ball-milling with the assistance of dielectric barrier discharge plasma was used in synthesis of ultrafine sulfur particles anchored on in situ exfoliated graphene for Li–S batteries. The ultrafine sulfur particles formed not only afford more sufficient electrical contact towards graphene support, but also alleviate volume expansion compared with bulk sulfur. On the other hand, with robust etching function of dielectric barrier discharge plasma, little oxygen-doping was observed in exfoliated few-layer graphene, offering sufficient capture sites towards lithium polysulfides. The ultrafine sulfur/graphene composite with little oxygen-doping exhibits superior cycling performance and rate capability in contrast to the control samples without the exertion of dielectric barrier discharge plasma. Little capacity degradation rate of 0.07% per cycle was achieved at 0.5C over 500 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2020
·
IF 16.28
Sha Li,Pan Xu,Muhammad Kashif Aslam,Changguo Chen,Arif Rashid,Gulian Wang,Li Zhang,Bingwei Mao
Li–S batteries have received unprecedented attention owing to their exceptionally high energy density and low cost. Nevertheless, the daunting challenges of insulating properties, soluble polysulfide shuttling, drastic volume change and sluggish polysulfide conversion kinetics, still hinder their application towards commercialization . Very recently, exciting progresses have been made on inorganic/organic polar hosts as either polysulfide immobilizers or polysulfide redox accelerators, targeting durable Li–S batteries. Herein, self-assembled NiCo 2 S 4 granules comprising secondary open-hole tubular structures are first devised as highly-efficient host materials for high-sulfur-loading and durable Li–S batteries. NiCo 2 S 4 hosts are featured with their large porosity, high electronic conductivity , rapid ion conduction, strong polysulfide immobilization capability and catalytic effect on polysulfide redox, thus greatly ameliorating the polysulfide-shuttle issue and accelerating the polysulfide conversion kinetics. Therefore, the NiCo 2 S 4 /S cathode shows a reversible capacity of 1387 mAh g −1 at 0.2C and retains a value of 543 mAh g −1 after 500 cycles at 2 C. Impressively, the NiCo 2 S 4 /S cathode with a sulfur loading of 8.9 mg cm −2 exhibits high areal capacity of 8.3 mAh cm −2 , low polarization and high cycling stability. Moreover, the as-derived soft-package battery with a 4.5 mg cm −2 sulfur loading can power 169 light-emitting diodes, verifying its great potential for practical application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Maru Dessie Walle,Ke Zeng,Mengyuan Zhang,Yajuan Li,You-Nian Liu
Lithium–sulfur (Li–S) batteries have attracted an increasing attention for advanced energy storage devices, because of their high energy density, low cost and lower environmental impacts. However, their commercial applications are still hampered with the low conductivity and sulfur utilization, the low sulfur loading and the serious capacity fading at a high current rate. Herein, we prepared flower-like molybdenum disulfide and carbon nanotubes (MoS 2 /CNTs) composites with mesoporous structures for high sulfur utilization cathodes. The flower-like MoS 2 can immobilize sulfur and obstruct the solubility of polysulfide within the structures. The MoS 2 /CNTs-S cathode with 2.6 mg cm −2 sulfur loading and capacity per area of 3.83 mA h cm −2 delivers an initial specific discharge capacity of 1473 mA h g −1 with 88.0% sulfur utilization and maintains a reversible capacity of 855.5 mA h g −1 with coulombic efficiency up to 96.6% after 50 cycles at the current rate of 0.2 C (335.0 mA g −1 ). Impressively, the MoS 2 /CNTs-S cathode at 5 C shows the high specific capacity of 1254 mA h g −1 with 76.0% sulfur utilization and maintains 384.0 mA h g −1 with an average coulombic efficiency of 91% after 200 cycles. The MoS 2 /CNTs-S cathode could be a good candidate for high-performance Li–S battery.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Jinping Ma,Chi Zhang,Daxin Huang,Bin Yang,Yang Tian,Baoqiang Xu,Hongwei Yang,Xiumin Chen,Changming Chen,Yifu Li
Recovering valuable resources from waste sulfur slag is profoundly significant in terms of making profit and encouraging sustainable development within the tin industry. Sulfur slag is a hazardous waste , and a substantial amount of tin and cuprous sulfide is present in waste sulfur slag. However, tin and cuprous sulfide readily react to form stable metal compounds, which creates a barrier for effective sulfur slag recovery. The separation of copper-tin is essential for the efficient recovery and reuse of sulfur slag. In this paper, the physical composition and structural characteristics of the microstructure of sulfur slag were systematically characterized and confirmed. Thermodynamic calculations were then carried out to analyze the sulfuration reaction mechanism of tin and cuprous sulfide during the airtight sulfuration process and to study the volatilization of stannous sulfide and the decomposition properties of copper sulfide under vacuum conditions. Thermodynamic analysis showed that the products of tin and cuprous sulfide after being sulfided were SnS, SnS 2 , Sn 2 S 3 and CuS, but they decomposed and existed in the form of SnS and Cu 2 S. According to the difference of saturated vapor pressure , SnS and Cu 2 S can be separated under the vacuum condition with high temperature. Finally, experiments were conducted to verify the reliability of the thermodynamic analysis, with good agreement between the two. The extraction purities of stannous sulfide and cuprous sulfide reached 97.87 % and 97.70 %, respectively. The direct yield of tin and copper were 99.66 % and 99.27 %, respectively. The separation efficiency of tin and copper was 99.81 %. The results confirmed that the airtight sulfuration-vacuum distillation method is a feasible alternative for high-value metal resource recovery and reuse from waste sulfur slag. This research contributes to the understanding of the recovery of metal resources from sulfur slag with the airtight sulfuration-vacuum distillation process, showing that it is a significant competitive alternative to existing sulfur slag recovery methods.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 10
·1207
·
IF 4.501
Chenliu Tang,Zhicheng Long,Yidan Wang,Dongze Ma,Xiaobiao Zhu
This study investigated the inhibition effects of sulfate on ferrous ion-activated persulfate oxidation of azo dye reactive brilliant red X-3B. The experimental results showed that the degradation efficiency of reactive brilliant red X-3B decreased from 100% to 63% in 60 min when the initial concentration of sulfate increased from 0 to 3 g/L. The ferrous/persulfate molar ratio had remarkable influence on persulfate oxidation capability in presence of sulfate. SO42−could coordinate with Fe2+and Fe3+in generating FeSO4ion pairs as well as FeSO4+or Fe(SO4)2−complexes, which were difficult to activate persulfate and reduced the regeneration of Fe2+. Radicals quenching and electron paramagnetic resonance experiments showed that ·OH and SO4·−were responsible for the oxidation of reactive brilliant red X-3B; however, the addition of sulfate significantly inhibited the generation of SO4·−, and then the generation of ·OH. Moreover, the corresponding Nernst equation indicated that high concentration of sulfate reduced the oxidation potential of SO4·−/SO42−. Experimental results proved that the adverse effects of sulfate on the persulfate oxidation could be counteracted either by batch addition of ferrous or by adding Ba2+to remove SO42−in the system.Keywords:persulfate;sulfate;sulfate radicals;reactive brilliant red X-3B
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）