MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Zhongxu Li,Shengzhao Zhang,Zhao Jiang,Dan Cai,Changdong Gu,Jiangping Tu
A novel cheap eutectogel (ETG) membrane based on the deep eutectic solvent (DES) immobilized poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) is proposed as a solid electrolyte for safe lithium metal batteries in this study. The composition of DES is optimized, which is prepared by mixing the N-methylacetamide (NMAC) and the lithium bis [(trifluoromethyl)sulfonyl]imid (LiTFSI) with a molar ratio of 4:1. The eutectogel is formed by incorporating 70 wt% DES into the PVDF-HFP, which is non-flammable and shows excellent mechanical properties. This ETG membrane electrolyte with a thickness about 25 μm possess a high ionic conductivity (3.05 × 10 −4 S cm −1 ) at room temperature and a wide electrochemical stability window (~5 V). The Li//ETG//LiFePO 4 full cells deliver an acceptable discharge capacity of ~133.9 mAh g −1 at 0.1C and room temperature after 100 charge-discharge cycles. The ETG membrane electrolyte can also endow the Li//ETG//LiFePO 4 pouch cell with flexibility and withstanding abuse operations, like nail penetration and cutting. We expect that the flexible and non-flammable eutectogel membrane will have implications for the use of DES based ionic liquids in the synthesis of advanced solid-state electrolytes for safer lithium batteries .
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子物理
·
电池技术
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 4
·929-935
·
IF 2.119
Li Weibiao,Li Xiaozhe,Xie Xiaohua,Yuan Anbao,Xia Baojia
A thin composite separator with polyethylene terephthalate nonwoven membrane as the structural support and polyvinylidene fluoride-hexafluoropropylene as the coating layer for lithium-ion batteries was prepared by a simple dip-coating process. The effect of different drying temperatures on the performance of the composite separator was investigated. The results indicate that 80 °C is the optimal drying temperature, preventing leakage current problems and providing a well-developed porous structure. The drying of the composite separator at 80 °C provides a superior thermal stability, better wettability with electrolyte, higher electrolyte uptake, and ionic conductivity compared to commercially available polypropylene (PP) separator. Furthermore, the electrochemical performance consisting of electrochemical stability, self-discharge, cycle performance, rate performance of the composite separator, and PP were determined. The drying of the composite separator at 80 °C shows almost the same oxidation stability and self-discharge performance, but a better cycling and rate performance than the PP separator.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子材料
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wenliang Feng,Jing Zhang,Abdulmalik Yusuf,Xiang Ao,Dongfeng Shi,Vinodkumar Etacheri,De-Yi Wang
The practical application of sodium-ion hybrid capacitors is limited by their low energy densities resulted from the kinetics mismatch between cathodes and anodes, and the fire safety related to the flammable electrolyte-separator system. Hence, we report a rational design of metal–organic frameworks (MOFs, UiO-66) modified PVDF-HFP separator. High tensile strength and dimensional thermal stability of the separator reduce the risk of electrode short circuit caused by the separator deformation. MCC test demonstrates a reduction of 75% in peak heat release rate (pHRR), indicating an enhanced fire-resistant property of the separator. This is due to the transformation of UiO-66 into ZrO 2 accompanied by the consumption of oxygen and the formation of the barrier char that suppresses further heat release. Quasi-solid-state electrolyte prepared based on this separator presents an enhanced ionic conductivity of 2.44 mS cm −1 and Na-ion transference number of 0.55, which are related to the high porosity (>70%) and electrolyte uptake (~320%) of the separator. Moreover, the open metal sites of UiO-66 can capture PF 6 – and consequently liberate the Na + for faster migration, thus reducing the kinetics mismatch between cathodes and anodes. Such multifunctional separator enables the quasi-solid-state Na-ion hybrid capacitor to achieve high energy density (182 Wh kg −1 @31 W kg −1 ) and power density (5280 W kg −1 @22 Wh kg −1 ), as well as excellent cyclic stability (10,000 cycles @1000 mA g −1 ).
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 Energy Storage
·
2024
·
IF 8.9
Wenjie Yuan,Jinlong Liao,Songde Huang,Dakun Song,Qinting Su,Cuihua Li,Jinhua He
Solid lithium metal batteries with solid polymer electrolytes have advantages in terms of high energy density and safety. However, their application is still hindered by unstable solid electrolyte interfaces (SEI and CEI) and uncontrolled dendrite growth. Here, a composite skeleton loaded with dielectric filler yttrium stabilized zirconia nanoparticles (YSZ) on the surface of PVDF-HFP nanofiber filaments is designed, and a novel composite solid electrolyte (CSE) is prepared by in-situ polymerization of DOL (1,3-dioxolane) on this framework to achieve safe and stable high-voltage lithium metal battery (LMB). The dual stable electrode interfaces (CEI and SEI) constructed by in-situ can effectively suppress the generation of lithium dendrites and suppress the degradation of the high-voltage NCM811 positive electrode structure and the generation of cracks in NCM811 particles, endowing the battery with extraordinary performance. The as-obtained CSE exhibits high ionic conductivity of 1.01 × 10 −3 S cm −1 at 30 °C, the enlarged electrochemical window of 6.0 V, and the Li + transference number is 0.72. The assembled Li|NCM811 battery is capable of stable cycling for 400 cycles at a cut-off voltage of 4.5 V and current density of 1C, with a capacity decay of only 0.074 % per cycle. .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Ming Cai,Ding Yuan,Xiao Zhang,Yi Pu,Xiaofang Liu,Hongwei He,Lixue Zhang,Xin Ning
Here, a novel PVDF-HFP/PI side-by-side bicomponent electrospun separator with cross-linked structure is successfully fabricated for lithium-ion batteries (LIBs). The bicomponent composite fiber not only integrates the excellent characteristics of PVDF-HFP and PI , but also improves the mechanical strength of the electrospun nonwoven and maintains a high level of porosity, up to 85.9 %. Moreover, the PVDF-HFP/PI(T) fibrous separator emerges outstanding performance, including the thermal dimensional stability (up to 200 °C), self-extinguishment, high electrolyte uptake (483.5 %), good ionic conductivity (1.78 × 10 −3 S/cm), wide electrochemical stability window (up to 4.94 V vs. Li + /Li) and favorable interface structure . It is further confirmed by the 3D simulation that the PVDF-HFP/PI(T) nonwoven using as the LIBs separator is beneficial to the homogeneous transmission of lithium ions . As a result, the coin cells with PVDF-HFP/PI(T) separator possess the best first discharge capacity (120.41 mAh g −1 ) and coulombic efficiency (99.36 %) with respect to that of Celgard2320 separator and cross-electrospun PVDF-HFP + PI(T) separator. After 50 cycles, the discharge capacity of Li/PVDF-HFP/PI(T)/LiFePO 4 is found to be retained around 98.13 %, which is higher than 94.91 % of Celgard2320 separator and 96.09 % of cross-electrospun PVDF-HFP + PI(T) separator. Moreover, the coin cell using the PVDF-HFP/PI (T) separator exhibited good discharge capacity under different discharge C-rate at 45 °C, indicating its potential for the high-temperature safety of LIBs. In sum, the PVDF-HFP/PI(T) nonwoven with excellent property has an application prospect in the field of LIBs separator, which also provides a reliable strategy for designing the electrospun separator with improved performance.
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 POWER SOURCES
·
2025
·
IF 7.9
Yuxin Zhou,Tianhuan Huang,Shaohua Zhong,Xiaoqing Li,Yiwen Chen,Kunyao Su,Weihuang Yang,Jiangrong Lu,Jian Zhang
Modified poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP) exhibits excellent electrochemical stability and safety, making it one of the most promising gel polymer electrolytes (GPEs) for lithium metal batteries. To further optimize the performance of PVDF-HFP GPEs, N-formylmorpholine is used as a novel high-boiling nonsolvent for PVDF-HFP, and a uniform porous network rich in the β phase is prepared through a nonsolvent induced phase separation method. The optimized PVDF-HFP GPE (PNG10), enriched with the strongly polar β phase, can better promote the dissociation of lithium salts, while the uniform porous network provides the necessary conditions for the uniform distribution and conduction of ions, optimizing the electrode/electrolyte interface. As a result, the PNG10 GPEs achieves a simultaneous enhancement of ionic conductivity (1.32 × 10 −3 S cm −1 ) and lithium-ion transference number (0.82). Moreover, the Li|PNG10|LiFePO 4 cells demonstrate excellent long-term cycling stability and rate performance. The study highlights the importance of high-throughput porous network structures in the design of GPEs.
研究领域:
电化学
·
高分子科学
·
储能
·
材料科学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ningbo Cheng,Dongyang Miao,Chao Wang,Yanyan Lin,Aijaz Ahmed Babar,Xianfeng Wang,Zhaohui Wang,Jianyong Yu,Bin Ding
Growing demand for efficient and economical cooling for indoor as well as outdoor applications, especially personal cooling in outdoor environments, is a major global challenge today. Currently, tailored optical structures with spectral selectivity are being used as cooling strategies. However, developing these photonic structures generally requires sophisticated multi-step manufacturing processes and use of multiple solvents which limits their acceptability for large-scale production and cost-effectiveness. Therefore, for the first time, herein we report the fabrication of nanosphere-structured hierarchically porous poly (vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) fibrous fabric via a facile one-step electrospinning process based on water vapor-induced phase separation (WVIPS) technique using single solvent. The fabricated fabric with interconnected nanospheres structure and hierarchically porous fibers possessed large roughness and high specific surface area. Cooling performance of the fabricated PVDF-HFP fabrics was evaluated using skin simulators to mimic human body. The as-prepared PVDF-HFP fabric exhibits a superior average solar reflectance (∼93.7 %) and infrared emittance (∼91.9 %), yielding a temperature drop of ∼19.8 °C and ∼13.2 °C compared to the bare skin simulator and the one covered with cotton fabric, respectively, under solar intensity of ∼950 W m −2 . Additionally, excellent hydrophobicity and adsorption make designed fabrics potentially suitable materials for not only radiative cooling but also for waterproof and filtration applications.
研究领域:
材料科学
·
环境科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 6
·期 2
·440-448
·
IF 6.367
Xin Liang,Lulu Wang,Yang Wang,Yongchao Liu,Yi Sun,Hongfa Xiang
The functional design of separators has been proved to be one of the most efficient methods to improve the electrochemical performance of lithium–sulfur batteries. In this work, a multifunctional separator with gradual changes to four aspects was constructed by integrating a PVDF-HFP/h-BN membrane with a Co-doped carbon nanofiber. The architecture has four gradations, which offers multifold advantages. First, in terms of density, there is a transition from loose to dense, which results in a higher electrolyte uptake rate, reduces the amount of free electrolyte and further suppresses the shuttle effect. Additionally, in terms of composition, a transition from inorganic to organic is designed, which allows the inorganic and organic components to bind closely and reduces the interfacial resistance. Meanwhile, there is a transition from high electronic conductivity to insulation. The change in electronic conductivity leads to effective conversion of the polysulfide. Finally, in terms of ionic conductivity, there is a transition from low to high, which gives the separator better ability to conduct lithium ions. As a consequence, a battery with the as-constructed multifunctional separator performs with good capacity stability, which demonstrates a new concept for high-performance lithium–sulfur battery design.
研究领域:
材料科学
·
储能技术
·
电池技术
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5251-5260
·
IF 9.5
Fang Chang,Huang Kangsheng,Zhao Jing,Tian Shiqi,Dou Hui,Zhang Xiaogang
Despite the high energy density of lithium metal batteries (LMBs), their application in rechargeable batteries is still hampered due to insufficient safety. Here, we present a novel flame-retardant solid-state electrolyte based on polyvinylidene fluoridehexafluoropropylene (PVDF-HFP) with nano SiO 2 aerogel as an inert filler but Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) as an auxiliary component to enhance the ion conductivity. The introduction of SiO 2 aerogels imparts the polymer electrolyte with exceptional thermal stability and flame retardancy. Simultaneously, the interaction between hydroxyl groups of SiO 2 particles and PVDF-HFP creates a strong cross-linking structure, enhancing the mechanical strength and stability of the electrolyte. Furthermore, the presence of SiO 2 aerogel and LLZTO facilitates the dissociation of lithium salts through Lewis acid-base interactions, resulting in a high ionic conductivity of 1.01 × 10 − 3 S·cm − 1 and a wide electrochemical window of ∼ 5.0 V at room temperature for the prepared electrolytes. Remarkably, the assembled Li|Li cell demonstrates the excellent resistance to lithium dendrite and runs stablly for over 1500 h at a current density of 0.25 mA·cm −2 . Thus, we prepare a pouch cell with high safety, which can work normally after short-circuiting under the external folding and cutting.
研究领域:
材料科学
·
电化学
·
高分子科学
·
储能技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xinya Wang,Changfa Xiao,Hailiang Liu,Mingxing Chen,Hongyan Xu,Wenpeng Luo,Fan Zhang
In this study, a novel and multifunctional polyvinylidene fluoride-co-hexafluoropropyle (PVDF-HFP)/catechol-polyethyleneimine (CA-PEI)/Ag/3-glycidyloxy propyltrimethoxysilane (KH560) tubular nanofiber membrane (TNM) for applications in dye degradation and oil/water separation was fabricated. Firstly, the PVDF-HFP tubular nanofiber membranes were modified by using a mussel-inspired method. Then, Ag nanoparticles were assembled on the nanofiber surface to improve their excellent catalytic capacity for Methylene blue (MB) and Congo red (CR). Finally, the hydrophilic KH560 was grafted on nanofiber surface and the effects of KH560 concentration on the membrane performance were investigated. The results showed that when the KH560 concentration was 3 wt%, the modified membranes possessed a higher hydrophilicity and permeability. Meanwhile, it could also effectively separate various oil-in-water emulsions with high separation rate and separation efficiency at 0.02 MPa. Moreover, the catalytic and oil/water separation performances had no discernible decay after ten cycle tests, which promoted the potential application of modified PVDF-HFP TNMs for the treatment of practical oily wastewater.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Lingguang Yi,Changfei Zou,Xiaoyi Chen,Jiali Liu,Shuang Cao,Xiyuan Tao,Zihao Zang,Li Liu,Baobao Chang,Yongqiang Shen,Xianyou Wang
The safety issue of lithium batteries based on liquid electrolytes has become the focus of attention, especially when the batteries are exposed to mechanical, thermal, or electrical abuse conditions. To address this issue, gel polymer electrolytes (GPEs) have attracted widespread interest due to the property of solid–liquid coexistence with higher ionic conductivity, flexibility, and safety. In this work, a poly(vinylidene-fluoride-co-hexafluoropropylene) (PVDF-HFP)/poly(methyl methacrylate) (PMMA) matrix GPE, containing bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) and spherical zirconium dioxide (ZrO2) nanoparticles, is successfully designed and synthesized by a simple one-step solution-casting route. It has been found that the obtained PVDF-HFP/PMMA-ZrO2-6% (PPZ-6%) electrolyte film possesses an excellent tensile strength of 37.7 MPa. Moreover, the PPZ-6% GPE not only has a high ionic conductivity of 1.46 × 10–3 S cm–1 at 25 °C but also presents excellent interface compatibility in an Li||Li symmetrical battery. The LiFePO4||Li cell assembled with the PPZ-6% GPE exhibits good cyclic stability at room temperature, e.g., a high discharge specific capacity of 153.0 mAh g–1, and a high Coulombic efficiency of 99% after 200 cycles at 0.5 C. Therefore, this organic–inorganic hybrid GPE modified with spherical ZrO2 nanoparticles reveals a good application prospect for high-performance lithium metal batteries (LMBs).
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 23
·e2320012121
·
IF 9.4
Xin He,Youxuan Ni,Wenjiao Ma,Qiu Zhang,Zhenkun Hao,Yunpeng Hou,Haixia Li,Zhenhua Yan,Kai Zhang,Jun Chen
Rechargeable sodium-oxygen (Na–O2) battery is deemed as a promising high-energy storage device due to the abundant sodium resources and high theoretical energy density (1,108 Wh kg–1). A series of quasisolid electrolytes are constantly being designed to restrain the dendrites growth, the volatile and leaking risks of liquid electrolytes due to the open system of Na–O2 batteries. However, the ticklish problem about low operating current density for quasisolid electrolytes still hasn’t been conquered. Herein, we report a rechargeable Na–O2 battery with polyvinylidene fluoride-hexafluoropropylene recombination Nafion (PVDF–HFP@Nafion) based quasisolid polymer electrolyte (QPE) and MXene-based Na anode with gradient sodiophilic structure (M-GSS/Na). QPE displays good flame resistance, locking liquid and hydrophobic properties. The introduction of Nafion can lead to a high Na+ migration number (tNa+ = 0.68) by blocking the motion of anion and promote the formation of NaF-rich solid electrolyte interphase, resulting in excellent cycling stability at relatively high current density under quasisolid environment. In the meantime, the M-GSS/Na anode exhibits excellent dendrite inhibition ability and cycling stability. Therefore, with the synergistic effect of QPE and M-GSS/Na, constructed Na–O2 batteries run more stably and exhibit a low potential gap (0.166 V) after an initial 80 cycles at 1,000 mA g–1 and 1,000 mAh g–1. This work provides the reference basis for building quasisolid state Na–O2 batteries with long-term cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）