ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Qiufang Yao,Hanwei Wang,Chao Wang,Chunde Jin,Qingfeng Sun
Bradyrhizobium japonicum (BJ), which has a symbiotic relationship with soybean roots, possessed an abundant three-dimensional (3D) structure with a high N content. A soybean leaf (SL) with a hierarchically ordered macroporous network and numerous polar hydroxyl groups was proposed as a separator for a supercapacitor. A 3D hierarchical porous carbon was prepared by the facile carbonization with chemical activation of BJ. The as-prepared material possesses a large specific surface area (1275 m2·g–1), unique 3D hierarchical porosity, and good electrical conductivity. The electrochemical performance of the Bradyrhizobium japonicum-derived porous carbons at a mass ratio of 1.5 (ZnCl2/BJ = 1.5) (BJPC-1.5) for supercapacitors with a SL separator showed a high capacitance (358 F/g at 1 A·g–1), a superior cycle stability of 91% over 8000 cycles, and a superior rate capability in a symmetric two-electrode supercapacitor in 6 M KOH. Furthermore, the electrochemical performance of the BJPC-1.5 with a SL separator was comparable to that with the commercialized cellulose and polypropylene (PP) separators. More attractively, the SL separator with a preferable water uptake showed a much better performance in the BJPC-1.5 cell than the PP separator. These results provide an insight into the full usage of a natural and biodegradable biomass for separator and electrode materials for a supercapacitor.
研究领域:
材料科学
·
微生物学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 8
·1347
·
IF 5.719
Wen Jiang,Lingling Dong,Shuanghui Liu,Shuangshuang Zhao,Kairu Han,Weimin Zhang,Kefeng Pan,Lipeng Zhang
Lithium-sulfur batteries exhibit great potential as one of the most promising energy storage devices due to their high theoretical energy density and specific capacity. However, the shuttle effect of the soluble polysulfide intermediates could lead to a severe self-discharge effect that hinders the development of lithium-sulfur batteries. In this paper, a battery separator has been prepared based on NiFe2O4/Ketjen Black (KB) modification by a simple method to solve the shuttle effect and improve the battery performance. The as-modified separator with the combination of small-size KB and NiFe2O4nanoparticles can effectively use the physical and chemical double-layer adsorption to prevent polysulfide from the shuttle. Moreover, it can give full play to its catalytic effect to improve the conversion efficiency of polysulfide and activate the dead sulfur. The results show that the NiFe2O4/KB-modified separator battery still maintains a discharge capacity of 406.27 mAh/g after 1000 stable cycles at a high current density of 1 C. Furthermore, the coulombic efficiency remains at 99%, and the average capacity attenuation per cycle is only 0.051%. This simple and effective method can significantly improve the application capacity of lithium-sulfur batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Junling Wang,Chao Cheng,Jiali Zhang,Junjie Yang,Zhirong Wang,Li Li,Wei Bai,Yuen Kwok Kit Richard
Lithium-ion batteries (LIBs) have been widely used in daily life and industrial manufacture, which concurrently suffers from the high thermal runaway (TR) hazard. The separator is believed to play a crucial role in affecting the performance and safety of battery. However, the influence of novel separator on TR action of battery is rarely investigated. In this paper, the polyimide-based flame-retardant separator (TiO 2 @PZS@PI) is prepared via electrospinning and hot amination. Compared with Celgard separator, the ion conductivity, electrolyte uptake, porosity of separator are increased by 2011.2 %, 1511.8 %, 659.5 %, while the self-extinction time is reduced by 92.1 %. In comparison to Celgard battery, the battery with TiO 2 @PZS@PI separator shows a marked increase in the starting temperature of TR (∼70 °C) and obvious delay in time to peak TR temperature (∼561 min). Moreover, such separator holds the marked ability to inhibit the growth of lithium dendrites. These results signify that the flame-retardant separator effectively improves the battery safety. In addition, the using of TiO 2 @PZS@PI separator not only improves the specific discharge capacity of battery, but also delays the capacity attenuation of battery. Of note, the internal resistance of battery equipped with TiO 2 @PZS@PI separator is greatly reduced. This work could provide innovative insights into the design of fire-resistant and mechanically robust separator to enhance the performance and safety of LIBS.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2016
·Vol. 24
·期 11
·965-972
·
IF 1.357
Xie Min,Wang Jun,Wang Xu,Yin Mingying,Wang Ce,Chao Danming,Liu Xincai
In this work, electrospun poly(ether sulfone) (PES) nanofibrous membranes coated with hydrophilic polydopamine (PES-PDA) were successfully prepared. As a separator of lithium-ion batteries, the prepared PESPDA nanofibrous membrane shows ultrahigh porosity, due to the extra-large surface area of the nanofibers. Moreover, good thermostability of PES and polydopamine also results in the low shrinkage of the membrane under high temperature. As a result of the large number of amine groups and phenolic hydroxyl groups from the polydopamine, superior electrolyte wettability and high liquid electrolyte uptake capacity of the PES-PDA nanofibrous membrane have also been disclosed through comprehensive study, which would decrease the electrolyte absorption time and improve the performance of the battery. In the cell evaluation, an expected enhancement of cell performance with reduced polarization phenomenon and improved cycling stability is observed after coating with polydopamine, which certifies the validity of the polydopamine coating.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 26
·10686-10698
·
IF 4.5
Pan Chen,Wei Xing,Feng Yuting,Wei Zhenzhen,Zhao Yan
The separator is an essential component of lithium-ion batteries (LIBs), and polyimide (PI), a high-performance polymer with outstanding mechanical and thermal properties and a strong electrolyte affinity, has received substantial research as a potential separator material. In this work, we fabricated a PI composite separator (PI/WO 3 ) by combining the components in one step with concurrently electrospinning the precursor solution and electrospraying the WO 3 nanoparticles. The one step mixing method made the WO 3 uniformly distribute on the PI nanofiber surfaces with a result of porosity decrease. Although the introduction of WO 3 nanoparticles did not alter the chemical structure and the excellent thermal stability, the electrolyte wettability, mechanical strength and electrochemical performance of PI separator were all significantly improved by the nanoparticles, endowing the composite separator with superior cycle stability. Therefore, the use of WO 3 in a polyimide separator has practical significance for high safety and high performance of LIBs.
Graphical Abstract
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Zhongfeng Ji,Ting Hu,Zhiwei Zhu,Dichen Wu,Shanshan Lv,Shiyu Yuan,Taiwei Zou,Xuewei Fu,Wei Yang,Yu Wang
A polymer separator plays a pivotal role in battery safety, overall electrochemical performance, and cell assembly process. Traditional separators are separately produced from the electrodes and dominated by porous polyolefin thin films. In spite of their commercial success, today’s separators are facing growing challenges with the increasing demand on the device safety and performance. As an attempt to address this urgent need, here, we propose a concept of in situ separator technology by manipulating the two-dimensional (2D) microfluid nanophase separation (2D-MFPS) of a poly(vinylidene difluoride)/lithium salt solution during drying. Particularly, nanophase separation is effectively regulated by low humidity, salt type, and compositions. For application studies, this 2D-MFPS is directly performed onto commercial electrodes under drying conditions with low humidity to fabricate a high-performance in situ separator with thickness and porous structures comparable to those of commercial Celgard separators. This in situ separator shows superior performance in high-temperature stability and wetting capability to a variety of liquid electrolytes. Finally, pouch cells with this in situ separator technology are successfully assembled with an extremely simplified separator-stacking-free process and demonstrate stable cycle performance due to the well-controlled porous structures and electrode–separator interface.
研究领域:
材料科学
·
储能
·
高分子化学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Chaosheng Zhang,Xiwei Lan,Qing Liu,Le Yu,Yaqian Li,Xianluo Hu
LiMn 2 O 4 -based lithium-ion batteries (LIBs) have attracted considerable attention due to their cost advantage, but industrial use has been hindered by severe capacity deterioration during cycling with LiPF 6 -based carbonate electrolytes, especially under high-temperature (55 °C) cycling conditions. Herein, a bifunctional, Janus-faced, inorganic-organic hybrid separator is demonstrated to ensure long-term cycling reversibility of LiMn 2 O 4 ||graphite LIBs. The monolithic all-nanomat separator is constructed by a bottom layer of poly ( m -phenylene isophthalamide) nanofibers by electrospinning and a top layer of interpenetrating hydroxyapatite/bacterial cellulose fibers . Benefiting from such a unique Janus configuration, the as-formed separator exhibits synergistic coupling in functions, simultaneously scavenging trace acid and mitigating the dissolution/deposition of Mn 2+ ions in batteries. Consequently, the cells with the Janus separator achieve enhanced capacity retention compared with traditional cells with the commercial polyolefin separator over 100 cycles at 55 °C. Furthermore, bulk structure and surface chemistry characterizations confirm that irreversible structural change in the LiMn 2 O 4 cathode could be avoided, and the amount of manganese on the graphite anode from the cycled cells with the Janus separator is suppressed. This work demonstrates that a composite Janus all-nanomat separator offers an unexpected route towards highly durable LiMn 2 O 4 -based LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Ma Hong,Chen Hongli,Chen Minfeng,Li Anxin,Han Xiang,Ma Dingtao,Zhang Peixin,Chen Jizhang
The advancement of aqueous zinc-based batteries is greatly restricted by zinc dendrites. One potential solution to this challenge lies in the employment of high-modulus separators. However, achieving both high modulus and large ionic conductivity in a single separator remains a formidable task. Inspired by the wood architecture, this study breaks this trade-off by designing an anisotropic and biodegradable separator. This design significantly improves the modulus along the oriented direction while simultaneously facilitating fast Zn 2+ ion transport through aligned vertical channels. Additionally, this configuration resolves the contradiction between low separator thickness and good dendrite-inhibition capability. These benefits are supported by finite element simulations and comprehensive experimental validation, which also underscore the critical role of modulus enhancement for separators. By employing the anisotropic separator, a prolonged life span is realized for Zn||Zn cells, along with improved cyclability in full batteries. This work presents a strategy for separator modification towards dendrite-free metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yunyong Tang,Wen Song,Miao Guo,Guofeng Yang,Kunmei Su,Maliang Zhang,Zhenhuan Li
The separator plays a crucial role in alkaline water electrolysis (AWE) by conducting hydroxide ions and separating gases. Therefore, developing a high-performance AWE separator is of significant importance. This study proposes a method for preparing a hydrophilic polyphenylene sulfide (PPS) fabric separator. Firstly, PPS fabric separator undergoes a chloromethylation reaction to graft chloromethyl groups onto its surface, increasing its reactivity. Subsequently, chemical grafting introduces imidazole groups and quaternary ammonium groups to improve hydrophilicity. The modified PPS separator can rapidly conduct hydroxide ions and facilitate gas separation in alkaline solutions. Experimental results show that the modified PPS separator exhibits an area resistance of 0.219 Ω cm 2 in 30 wt % KOH solution at 80 °C, which is a 74.86 % reduction compared to the unmodified separator. Additionally, the bubble point pressure is enhanced by 2.46 %. During alkaline electrolysis experiments in a custom zero-gap electrolyzer, the modified separator demonstrates a current density of 493 mA cm −2 at a voltage of 2 V and maintains the stable performance after 500 h of operation, indicating the excellent electrolytic stability. This study provides a feasible reference for the industrial production of low-resistance, high gas-tightness AWE hydrogen production separators.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiaoli Hu,Tiao Huang,Ming Wang,Zhaowei Ren,Xiaofang Su,Tianzeng Huang,Hui Hu,Jianyi Wang,Jingyi Wu,Yanan Gao
The development of separator by tunning the zincophilic and iodide ion-repulsive properties of covalent organic frameworks (COFs) that regulate cycle lifespan and capacity of aqueous zinc-iodine (Zn-I 2 ) batteries is one of challenges. In this work, we have shown a systematic strategic-driven investigation to elucidate the role of functional triazine properties in COF modified separator towards overall performance of aqueous Zn-I 2 batteries. As such, three COFs with the same topology but different triazine number in their structures, have been synthesized, among which the triazine-richest framework, TAPA-TTB-COF-based separator demonstrated to be most effective to guide uniform Zn 2+ flux and simultaneously inhibit polyiodide shuttling due to the zincophilic nature and good iodide ion-repulsive capability of triazine. Consequently, the Zn||Gr@TAPA-TTB-COF@GF||Zn symmetric battery achieves a long life of more than 2100 h (5.0 mA cm −2 ) and the initial area capacity of the Zn||Gr@TAPA-TTB-COF@GF||I 2 battery reaches up to 5.5 mAh cm −2 (20 mA cm −2 ). After 2000 cycles, the discharge capacity can still maintain at 3.0 mAh cm −2 with a capacity decay rate of only 0.023 % per cycle. This study provides guidance for the rational design of functional COFs separators and promotes their application in high energy storage systems.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Tian Zhao,Saiqun Nie,Pengcheng Xiao,Shilin Peng,Jiayao Chen,Jiangrong Yu,Fuli Luo,Yi Chen
The formation of zinc dendrites and by-products significantly affects the cycling performance of aqueous zinc-ion batteries (AZIBs). This study presents the first application of MIL-101(Cr) as a separator material in AZIBs, investigating the impact of various MIL-101(Cr) morphologies in cellulose-based separators on battery performance. The findings demonstrate that separators incorporating spherical MIL-101(Cr) morphology considerably enhance ion conductivity and the transport rate of Zn 2+ ions while effectively inhibiting corrosion reactions and dendrite growth. Notably, the spherical MIL-101(Cr)-based separator exhibited more than double the cycle life of Zn//Zn symmetric cells compared to those made from octahedral and nano-fusion morphologies, achieving over 750 h of operation. Additionally, a Zn//MnO₂ full cells utilizing this separator achieved a remarkable capacity retention of 83.6 % after 400 cycles, with a close-to-100 % Coulombic efficiency. This research underscores the critical role of MIL-101(Cr) morphology in enhancing the performance of AZIB separators, paving the way for innovative designs in future metal-organic framework (MOF)-based separators.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Qilong Hao,Jing Zhao,Qing Wen,Jinling Yin,Guiling Wang
Sodium metal is considered a potential candidate for the anode in next-generation cost-effective and high-energy-density metal batteries. However, its practical application in ether-based electrolytes is severely hindered by the uncontrolled proliferation of sodium dendrites and the instability of the solid electrolyte interphase (SEI) layer. To address these challenges, we developed a lightweight, multifunctional separator using electrospinning technology. This separator, composed of a polymer-metal-organic framework composite (PAN/ZIF-67), offers a novel alternative to conventional bulky glass fiber separators. The PAN/ZIF-67 separator features a unique ordered structure and open active metal sites, which significantly enhance electrolyte wettability and promote anion adsorption, effectively guiding the uniform deposition of Na + . Experimental results confirmed its superior electrochemical performance, including low polarization voltage and high cycling stability, under standard ether-based electrolyte conditions without additives. In symmetric Na || Na cells equipped with the PAN/ZIF-67 separator, exceptional cycling stability was achieved, with a low polarization voltage of ∼12 mV at 1 mA cm −2 sustained over 1000 h and ∼66 mV at 5 mA cm −2 for over 500 h. In a full cell with a Na₃V₂(PO₄)₃ cathode and Na anode, the separator demonstrated excellent rate capability and cycling stability, maintaining a capacity retention of 72.4 % after 800 cycles at 5C. This work offers a possible solution to address critical issues in sodium metal batteries and represents a notable advancement toward their practical applications.
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
危险品化学品经营许可证（带存储）